1
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Andreev YM, Antonov A, Ayala Torres MA, Banerjee D, Banto Oberhauser B, Bernhard J, Bisio P, Celentano A, Charitonidis N, Cooke D, Crivelli P, Depero E, Dermenev AV, Donskov SV, Dusaev RR, Enik T, Frolov VN, Gertsenberger SV, Girod S, Gninenko SN, Hösgen M, Kachanov VA, Kambar Y, Karneyeu AE, Kekelidze GD, Ketzer B, Kirpichnikov DV, Kirsanov MM, Kolosov VN, Kramarenko VA, Kravchuk LV, Krasnikov NV, Kuleshov SV, Lyubovitskij VE, Marini A, Marsicano L, Matveev VA, Mena Fredes R, Mena Yanssen RG, Molina Bueno L, Mongillo M, Peshekhonov DV, Polyakov VA, Radics B, Salamatin KM, Samoylenko VD, Sieber H, Shchukin DA, Soto O, Tikhomirov VO, Tlisova IV, Toropin AN, Tuzi M, Volkov PV, Volkov VY, Voronchikhin IV, Zamora-Saá J, Zhevlakov AS. Dark-Sector Search via Pion-Produced η and η^{'} Mesons Decaying Invisibly in the NA64h Detector. PHYSICAL REVIEW LETTERS 2024; 133:121803. [PMID: 39373432 DOI: 10.1103/physrevlett.133.121803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2024] [Accepted: 08/13/2024] [Indexed: 10/08/2024]
Abstract
We present the first results from a proof-of-concept search for dark sectors via invisible decays of pseudoscalar η and η^{'} mesons in the NA64h experiment at the CERN SPS. Our novel technique uses the charge-exchange reaction of 50 GeV π^{-} on nuclei of an active target as the source of neutral mesons. The η,η^{'}→invisible events would exhibit themselves via a striking signature-the complete disappearance of the incoming beam energy in the detector. No evidence for such events has been found with 2.9×10^{9} pions on target accumulated during one day of data taking. This allows us to set a stringent limit on the branching ratio Br(η^{'}→invisible)<2.1×10^{-4} improving the current bound by a factor of ≃3. We also set a limit on Br(η→invisible)<1.1×10^{-4} comparable with the existing one. These results demonstrate the great potential of our approach and provide clear guidance on how to enhance and extend the sensitivity for dark sector physics from future searches for invisible neutral meson decays.
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Affiliation(s)
- Yu M Andreev
- Authors affiliated with an institute covered by a cooperation agreement with CERN
| | - A Antonov
- INFN, Sezione di Genova, 16147 Genova, Italia
| | - M A Ayala Torres
- Center for Theoretical and Experimental Particle Physics, Facultad de Ciencias Exactas, Universidad Andres Bello, Fernandez Concha 700, Santiago, Chile
- Millennium Institute for Subatomic Physics at High-Energy Frontier (SAPHIR), Fernandez Concha 700, Santiago, Chile
| | - D Banerjee
- CERN, European Organization for Nuclear Research, CH-1211 Geneva, Switzerland
| | - B Banto Oberhauser
- ETH Zürich, Institute for Particle Physics and Astrophysics, CH-8093 Zürich, Switzerland
| | - J Bernhard
- CERN, European Organization for Nuclear Research, CH-1211 Geneva, Switzerland
| | - P Bisio
- INFN, Sezione di Genova, 16147 Genova, Italia
- Università degli Studi di Genova, 16126 Genova, Italia
| | - A Celentano
- INFN, Sezione di Genova, 16147 Genova, Italia
| | - N Charitonidis
- CERN, European Organization for Nuclear Research, CH-1211 Geneva, Switzerland
| | - D Cooke
- UCL Departement of Physics and Astronomy, University College London, Gower St. London WC1E 6BT, United Kingdom
| | - P Crivelli
- ETH Zürich, Institute for Particle Physics and Astrophysics, CH-8093 Zürich, Switzerland
| | - E Depero
- ETH Zürich, Institute for Particle Physics and Astrophysics, CH-8093 Zürich, Switzerland
| | - A V Dermenev
- Authors affiliated with an institute covered by a cooperation agreement with CERN
| | - S V Donskov
- Authors affiliated with an institute covered by a cooperation agreement with CERN
| | - R R Dusaev
- Authors affiliated with an institute covered by a cooperation agreement with CERN
| | - T Enik
- Authors affiliated with an international laboratory covered by a cooperation agreement with CERN
| | - V N Frolov
- Authors affiliated with an international laboratory covered by a cooperation agreement with CERN
| | - S V Gertsenberger
- Authors affiliated with an international laboratory covered by a cooperation agreement with CERN
| | - S Girod
- CERN, European Organization for Nuclear Research, CH-1211 Geneva, Switzerland
| | - S N Gninenko
- Authors affiliated with an institute covered by a cooperation agreement with CERN
- Millennium Institute for Subatomic Physics at High-Energy Frontier (SAPHIR), Fernandez Concha 700, Santiago, Chile
| | - M Hösgen
- Universität Bonn, Helmholtz-Institut für Strahlen-und Kernphysik, 53115 Bonn, Germany
| | - V A Kachanov
- Authors affiliated with an institute covered by a cooperation agreement with CERN
| | - Y Kambar
- Authors affiliated with an international laboratory covered by a cooperation agreement with CERN
| | - A E Karneyeu
- Authors affiliated with an institute covered by a cooperation agreement with CERN
| | - G D Kekelidze
- Authors affiliated with an international laboratory covered by a cooperation agreement with CERN
| | - B Ketzer
- Universität Bonn, Helmholtz-Institut für Strahlen-und Kernphysik, 53115 Bonn, Germany
| | - D V Kirpichnikov
- Authors affiliated with an institute covered by a cooperation agreement with CERN
| | - M M Kirsanov
- Authors affiliated with an institute covered by a cooperation agreement with CERN
| | - V N Kolosov
- Authors affiliated with an institute covered by a cooperation agreement with CERN
| | - V A Kramarenko
- Authors affiliated with an institute covered by a cooperation agreement with CERN
- Authors affiliated with an international laboratory covered by a cooperation agreement with CERN
| | - L V Kravchuk
- Authors affiliated with an institute covered by a cooperation agreement with CERN
| | - N V Krasnikov
- Authors affiliated with an institute covered by a cooperation agreement with CERN
- Authors affiliated with an international laboratory covered by a cooperation agreement with CERN
| | - S V Kuleshov
- Center for Theoretical and Experimental Particle Physics, Facultad de Ciencias Exactas, Universidad Andres Bello, Fernandez Concha 700, Santiago, Chile
- Millennium Institute for Subatomic Physics at High-Energy Frontier (SAPHIR), Fernandez Concha 700, Santiago, Chile
| | - V E Lyubovitskij
- Authors affiliated with an institute covered by a cooperation agreement with CERN
- Millennium Institute for Subatomic Physics at High-Energy Frontier (SAPHIR), Fernandez Concha 700, Santiago, Chile
- Universidad Técnica Federico Santa María and CCTVal, 2390123 Valparaíso, Chile
| | - A Marini
- INFN, Sezione di Genova, 16147 Genova, Italia
| | - L Marsicano
- INFN, Sezione di Genova, 16147 Genova, Italia
| | - V A Matveev
- Authors affiliated with an international laboratory covered by a cooperation agreement with CERN
| | - R Mena Fredes
- Millennium Institute for Subatomic Physics at High-Energy Frontier (SAPHIR), Fernandez Concha 700, Santiago, Chile
- Universidad Técnica Federico Santa María and CCTVal, 2390123 Valparaíso, Chile
| | - R G Mena Yanssen
- Millennium Institute for Subatomic Physics at High-Energy Frontier (SAPHIR), Fernandez Concha 700, Santiago, Chile
- Universidad Técnica Federico Santa María and CCTVal, 2390123 Valparaíso, Chile
| | - L Molina Bueno
- Instituto de Fisica Corpuscular (CSIC/UV), Carrer del Catedratic Jose Beltran Martinez, 2, 46980 Paterna, Valencia, Spain
| | - M Mongillo
- ETH Zürich, Institute for Particle Physics and Astrophysics, CH-8093 Zürich, Switzerland
| | - D V Peshekhonov
- Authors affiliated with an international laboratory covered by a cooperation agreement with CERN
| | - V A Polyakov
- Authors affiliated with an institute covered by a cooperation agreement with CERN
| | - B Radics
- York University, Toronto, Canada
| | - K M Salamatin
- Authors affiliated with an international laboratory covered by a cooperation agreement with CERN
| | - V D Samoylenko
- Authors affiliated with an institute covered by a cooperation agreement with CERN
| | - H Sieber
- ETH Zürich, Institute for Particle Physics and Astrophysics, CH-8093 Zürich, Switzerland
| | - D A Shchukin
- Authors affiliated with an institute covered by a cooperation agreement with CERN
| | - O Soto
- Millennium Institute for Subatomic Physics at High-Energy Frontier (SAPHIR), Fernandez Concha 700, Santiago, Chile
- Departamento de Fisica, Facultad de Ciencias, Universidad de La Serena, Avenida Cisternas 1200, La Serena, Chile
| | - V O Tikhomirov
- Authors affiliated with an institute covered by a cooperation agreement with CERN
| | - I V Tlisova
- Authors affiliated with an institute covered by a cooperation agreement with CERN
| | - A N Toropin
- Authors affiliated with an institute covered by a cooperation agreement with CERN
| | - M Tuzi
- Instituto de Fisica Corpuscular (CSIC/UV), Carrer del Catedratic Jose Beltran Martinez, 2, 46980 Paterna, Valencia, Spain
| | - P V Volkov
- Authors affiliated with an international laboratory covered by a cooperation agreement with CERN
| | - V Yu Volkov
- Authors affiliated with an institute covered by a cooperation agreement with CERN
| | - I V Voronchikhin
- Authors affiliated with an institute covered by a cooperation agreement with CERN
| | - J Zamora-Saá
- Center for Theoretical and Experimental Particle Physics, Facultad de Ciencias Exactas, Universidad Andres Bello, Fernandez Concha 700, Santiago, Chile
- Millennium Institute for Subatomic Physics at High-Energy Frontier (SAPHIR), Fernandez Concha 700, Santiago, Chile
| | - A S Zhevlakov
- Authors affiliated with an international laboratory covered by a cooperation agreement with CERN
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2
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Andreev YM, Banerjee D, Banto Oberhauser B, Bernhard J, Bisio P, Celentano A, Charitonidis N, Chumakov AG, Cooke D, Crivelli P, Depero E, Dermenev AV, Donskov SV, Dusaev RR, Enik T, Frolov VN, Galleguillos Silva RB, Gardikiotis A, Gertsenberger SV, Girod S, Gninenko SN, Hösgen M, Kachanov VA, Kambar Y, Karneyeu AE, Kasianova EA, Kekelidze GD, Ketzer B, Kirpichnikov DV, Kirsanov MM, Kolosov VN, Kramarenko VA, Kravchuk LV, Krasnikov NV, Kuleshov SV, Lyubovitskij VE, Lysan V, Marini A, Marsicano L, Matveev VA, Mena Fredes R, Mena Yanssen RG, Molina Bueno L, Mongillo M, Peshekhonov DV, Polyakov VA, Radics B, Salamatin KM, Samoylenko VD, Sieber H, Shchukin DA, Soto O, Tikhomirov VO, Tlisova IV, Toropin AN, Tuzi M, Vasilishin BI, Volkov PV, Volkov VY, Voronchikhin IV, Zamora-Saá J, Zhevlakov AS. Search for Light Dark Matter with NA64 at CERN. PHYSICAL REVIEW LETTERS 2023; 131:161801. [PMID: 37925688 DOI: 10.1103/physrevlett.131.161801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2023] [Accepted: 09/14/2023] [Indexed: 11/07/2023]
Abstract
Thermal dark matter models with particle χ masses below the electroweak scale can provide an explanation for the observed relic dark matter density. This would imply the existence of a new feeble interaction between the dark and ordinary matter. We report on a new search for the sub-GeV χ production through the interaction mediated by a new vector boson, called the dark photon A^{'}, in collisions of 100 GeV electrons with the active target of the NA64 experiment at the CERN SPS. With 9.37×10^{11} electrons on target collected during 2016-2022 runs NA64 probes for the first time the well-motivated region of parameter space of benchmark thermal scalar and fermionic dark matter models. No evidence for dark matter production has been found. This allows us to set the most sensitive limits on the A^{'} couplings to photons for masses m_{A^{'}}≲0.35 GeV, and to exclude scalar and Majorana dark matter with the χ-A^{'} coupling α_{D}≤0.1 for masses 0.001≲m_{χ}≲0.1 GeV and 3m_{χ}≤m_{A^{'}}.
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Affiliation(s)
- Yu M Andreev
- Authors affiliated with an institute covered by a cooperation agreement with CERN
| | - D Banerjee
- CERN, European Organization for Nuclear Research, CH-1211 Geneva, Switzerland
| | - B Banto Oberhauser
- ETH Zürich, Institute for Particle Physics and Astrophysics, CH-8093 Zürich, Switzerland
| | - J Bernhard
- CERN, European Organization for Nuclear Research, CH-1211 Geneva, Switzerland
| | - P Bisio
- INFN, Sezione di Genova, 16147 Genova, Italia
- Università degli Studi di Genova, 16126 Genova, Italia
| | - A Celentano
- INFN, Sezione di Genova, 16147 Genova, Italia
| | - N Charitonidis
- CERN, European Organization for Nuclear Research, CH-1211 Geneva, Switzerland
| | - A G Chumakov
- Authors affiliated with an institute covered by a cooperation agreement with CERN
| | - D Cooke
- UCL Departement of Physics and Astronomy, University College London, Gower St. London WC1E 6BT, United Kingdom
| | - P Crivelli
- ETH Zürich, Institute for Particle Physics and Astrophysics, CH-8093 Zürich, Switzerland
| | - E Depero
- ETH Zürich, Institute for Particle Physics and Astrophysics, CH-8093 Zürich, Switzerland
| | - A V Dermenev
- Authors affiliated with an institute covered by a cooperation agreement with CERN
| | - S V Donskov
- Authors affiliated with an institute covered by a cooperation agreement with CERN
| | - R R Dusaev
- Authors affiliated with an institute covered by a cooperation agreement with CERN
| | - T Enik
- Authors affiliated with an international laboratory covered by a cooperation agreement with CERN
| | - V N Frolov
- Authors affiliated with an international laboratory covered by a cooperation agreement with CERN
| | - R B Galleguillos Silva
- Center for Theoretical and Experimental Particle Physics, Facultad de Ciencias Exactas, Universidad Andres Bello, Fernandez Concha 700, Santiago, Chile
- Millennium Institute for Subatomic Physics at High-Energy Frontier (SAPHIR), Fernandez Concha 700, Santiago, Chile
| | - A Gardikiotis
- Physics Department, University of Patras, 265 04 Patras, Greece
| | - S V Gertsenberger
- Authors affiliated with an international laboratory covered by a cooperation agreement with CERN
| | - S Girod
- CERN, European Organization for Nuclear Research, CH-1211 Geneva, Switzerland
| | - S N Gninenko
- Authors affiliated with an institute covered by a cooperation agreement with CERN
| | - M Hösgen
- Universität Bonn, Helmholtz-Institut für Strahlen-und Kernphysik, 53115 Bonn, Germany
| | - V A Kachanov
- Authors affiliated with an institute covered by a cooperation agreement with CERN
| | - Y Kambar
- Authors affiliated with an international laboratory covered by a cooperation agreement with CERN
| | - A E Karneyeu
- Authors affiliated with an institute covered by a cooperation agreement with CERN
| | - E A Kasianova
- Authors affiliated with an international laboratory covered by a cooperation agreement with CERN
| | - G D Kekelidze
- Authors affiliated with an international laboratory covered by a cooperation agreement with CERN
| | - B Ketzer
- Universität Bonn, Helmholtz-Institut für Strahlen-und Kernphysik, 53115 Bonn, Germany
| | - D V Kirpichnikov
- Authors affiliated with an institute covered by a cooperation agreement with CERN
| | - M M Kirsanov
- Authors affiliated with an institute covered by a cooperation agreement with CERN
| | - V N Kolosov
- Authors affiliated with an institute covered by a cooperation agreement with CERN
| | - V A Kramarenko
- Authors affiliated with an institute covered by a cooperation agreement with CERN
- Authors affiliated with an international laboratory covered by a cooperation agreement with CERN
| | - L V Kravchuk
- Authors affiliated with an institute covered by a cooperation agreement with CERN
| | - N V Krasnikov
- Authors affiliated with an institute covered by a cooperation agreement with CERN
- Authors affiliated with an international laboratory covered by a cooperation agreement with CERN
| | - S V Kuleshov
- Center for Theoretical and Experimental Particle Physics, Facultad de Ciencias Exactas, Universidad Andres Bello, Fernandez Concha 700, Santiago, Chile
- Millennium Institute for Subatomic Physics at High-Energy Frontier (SAPHIR), Fernandez Concha 700, Santiago, Chile
| | - V E Lyubovitskij
- Authors affiliated with an institute covered by a cooperation agreement with CERN
- Millennium Institute for Subatomic Physics at High-Energy Frontier (SAPHIR), Fernandez Concha 700, Santiago, Chile
- Universidad Técnica Federico Santa María and CCTVal, 2390123 Valparaíso, Chile
| | - V Lysan
- Authors affiliated with an international laboratory covered by a cooperation agreement with CERN
| | - A Marini
- INFN, Sezione di Genova, 16147 Genova, Italia
| | - L Marsicano
- INFN, Sezione di Genova, 16147 Genova, Italia
| | - V A Matveev
- Authors affiliated with an international laboratory covered by a cooperation agreement with CERN
| | - R Mena Fredes
- Millennium Institute for Subatomic Physics at High-Energy Frontier (SAPHIR), Fernandez Concha 700, Santiago, Chile
- Universidad Técnica Federico Santa María and CCTVal, 2390123 Valparaíso, Chile
| | - R G Mena Yanssen
- Millennium Institute for Subatomic Physics at High-Energy Frontier (SAPHIR), Fernandez Concha 700, Santiago, Chile
- Universidad Técnica Federico Santa María and CCTVal, 2390123 Valparaíso, Chile
| | - L Molina Bueno
- Instituto de Fisica Corpuscular (CSIC/UV), Carrer del Catedratic Jose Beltran Martinez, 2, 46980 Paterna, Valencia, Spain
| | - M Mongillo
- ETH Zürich, Institute for Particle Physics and Astrophysics, CH-8093 Zürich, Switzerland
| | - D V Peshekhonov
- Authors affiliated with an international laboratory covered by a cooperation agreement with CERN
| | - V A Polyakov
- Authors affiliated with an institute covered by a cooperation agreement with CERN
| | - B Radics
- York University, Toronto, Canada
| | - K M Salamatin
- Authors affiliated with an international laboratory covered by a cooperation agreement with CERN
| | - V D Samoylenko
- Authors affiliated with an institute covered by a cooperation agreement with CERN
| | - H Sieber
- ETH Zürich, Institute for Particle Physics and Astrophysics, CH-8093 Zürich, Switzerland
| | - D A Shchukin
- Authors affiliated with an institute covered by a cooperation agreement with CERN
| | - O Soto
- Millennium Institute for Subatomic Physics at High-Energy Frontier (SAPHIR), Fernandez Concha 700, Santiago, Chile
- Departamento de Fisica, Facultad de Ciencias, Universidad de La Serena, Avenida Cisternas 1200, La Serena, Chile
| | - V O Tikhomirov
- Authors affiliated with an institute covered by a cooperation agreement with CERN
| | - I V Tlisova
- Authors affiliated with an institute covered by a cooperation agreement with CERN
| | - A N Toropin
- Authors affiliated with an institute covered by a cooperation agreement with CERN
| | - M Tuzi
- Instituto de Fisica Corpuscular (CSIC/UV), Carrer del Catedratic Jose Beltran Martinez, 2, 46980 Paterna, Valencia, Spain
| | - B I Vasilishin
- Authors affiliated with an institute covered by a cooperation agreement with CERN
| | - P V Volkov
- Authors affiliated with an international laboratory covered by a cooperation agreement with CERN
| | - V Yu Volkov
- Authors affiliated with an institute covered by a cooperation agreement with CERN
| | - I V Voronchikhin
- Authors affiliated with an institute covered by a cooperation agreement with CERN
| | - J Zamora-Saá
- Center for Theoretical and Experimental Particle Physics, Facultad de Ciencias Exactas, Universidad Andres Bello, Fernandez Concha 700, Santiago, Chile
- Millennium Institute for Subatomic Physics at High-Energy Frontier (SAPHIR), Fernandez Concha 700, Santiago, Chile
| | - A S Zhevlakov
- Authors affiliated with an international laboratory covered by a cooperation agreement with CERN
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3
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Andreev YM, Banerjee D, Banto Oberhauser B, Bernhard J, Bisio P, Burtsev VE, Celentano A, Charitonidis N, Chumakov AG, Cooke D, Crivelli P, Depero E, Dermenev AV, Donskov SV, Dusaev RR, Enik T, Frolov VN, Gardikiotis A, Gerassimov SG, Gninenko SN, Hösgen M, Jeckel M, Kachanov VA, Karneyeu AE, Kekelidze G, Ketzer B, Kirpichnikov DV, Kirsanov MM, Kolosov VN, Kovalenko SG, Kramarenko VA, Kravchuk LV, Krasnikov NV, Kuleshov SV, Lyubovitskij VE, Lysan V, Marsicano L, Matveev VA, Mikhailov YV, Molina Bueno L, Peshekhonov DV, Polyakov VA, Radics B, Rubbia A, Samalantin KM, Samoylenko VD, Sieber H, Shchukin D, Soto O, Tikhomirov VO, Tlisova IV, Toropin AN, Vasilishin BI, Volkov PV, Volkov VY, Voronchikhin I, Zamora-Saá J. Search for a New B-L Z^{'} Gauge Boson with the NA64 Experiment at CERN. PHYSICAL REVIEW LETTERS 2022; 129:161801. [PMID: 36306760 DOI: 10.1103/physrevlett.129.161801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Accepted: 09/14/2022] [Indexed: 06/16/2023]
Abstract
A search for a new Z^{'} gauge boson associated with (un)broken B-L symmetry in the keV-GeV mass range is carried out for the first time using the missing-energy technique in the NA64 experiment at the CERN SPS. From the analysis of the data with 3.22×10^{11} electrons on target collected during 2016-2021 runs, no signal events were found. This allows us to derive new constraints on the Z^{'}-e coupling strength, which, for the mass range 0.3≲m_{Z^{'}}≲100 MeV, are more stringent compared to those obtained from the neutrino-electron scattering data.
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Affiliation(s)
- Yu M Andreev
- Institute for Nuclear Research, 117312 Moscow, Russia
| | - D Banerjee
- CERN, European Organization for Nuclear Research, CH-1211 Geneva, Switzerland
| | - B Banto Oberhauser
- ETH Zürich, Institute for Particle Physics and Astrophysics, CH-8093 Zürich, Switzerland
| | - J Bernhard
- CERN, European Organization for Nuclear Research, CH-1211 Geneva, Switzerland
| | - P Bisio
- INFN, Sezione di Genova, 16147 Genova, Italia
- Universitá degli Studi di Genova, 16126 Genova, Italy
| | - V E Burtsev
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
| | - A Celentano
- INFN, Sezione di Genova, 16147 Genova, Italia
| | - N Charitonidis
- CERN, European Organization for Nuclear Research, CH-1211 Geneva, Switzerland
| | - A G Chumakov
- Tomsk Polytechnic University, 634050 Tomsk, Russia
| | - D Cooke
- UCL Departement of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom
| | - P Crivelli
- ETH Zürich, Institute for Particle Physics and Astrophysics, CH-8093 Zürich, Switzerland
| | - E Depero
- ETH Zürich, Institute for Particle Physics and Astrophysics, CH-8093 Zürich, Switzerland
| | - A V Dermenev
- Institute for Nuclear Research, 117312 Moscow, Russia
| | - S V Donskov
- State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center 'Kurchatov Institute' (IHEP), 142281 Protvino, Russia
| | - R R Dusaev
- Tomsk Polytechnic University, 634050 Tomsk, Russia
| | - T Enik
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
| | - V N Frolov
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
| | - A Gardikiotis
- Physics Department, University of Patras, 265 04 Patras, Greece
| | - S G Gerassimov
- Technische Universität München, Physik Department, 85748 Garching, Germany
- P.N.Lebedev Physical Institute of the Russian Academy of Sciences, 119 991 Moscow, Russia
| | - S N Gninenko
- Institute for Nuclear Research, 117312 Moscow, Russia
| | - M Hösgen
- Universität Bonn, Helmholtz-Institut für Strahlen-und Kernphysik, 53115 Bonn, Germany
| | - M Jeckel
- CERN, European Organization for Nuclear Research, CH-1211 Geneva, Switzerland
| | - V A Kachanov
- State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center 'Kurchatov Institute' (IHEP), 142281 Protvino, Russia
| | - A E Karneyeu
- Institute for Nuclear Research, 117312 Moscow, Russia
| | - G Kekelidze
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
| | - B Ketzer
- Universität Bonn, Helmholtz-Institut für Strahlen-und Kernphysik, 53115 Bonn, Germany
| | | | - M M Kirsanov
- Institute for Nuclear Research, 117312 Moscow, Russia
| | - V N Kolosov
- State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center 'Kurchatov Institute' (IHEP), 142281 Protvino, Russia
| | - S G Kovalenko
- Center for Theoretical and Experimental Particle Physics, Facultad de Ciencias Exactas, Universidad Andres Bello, Fernandez Concha 700, Santiago, Chile
- Millennium Institute for Subatomic Physics at High-Energy Frontier (SAPHIR), Fernandez Concha 700, Santiago, Chile
| | - V A Kramarenko
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
- Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - L V Kravchuk
- Institute for Nuclear Research, 117312 Moscow, Russia
| | - N V Krasnikov
- Institute for Nuclear Research, 117312 Moscow, Russia
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
| | - S V Kuleshov
- Center for Theoretical and Experimental Particle Physics, Facultad de Ciencias Exactas, Universidad Andres Bello, Fernandez Concha 700, Santiago, Chile
- Millennium Institute for Subatomic Physics at High-Energy Frontier (SAPHIR), Fernandez Concha 700, Santiago, Chile
| | - V E Lyubovitskij
- Tomsk Polytechnic University, 634050 Tomsk, Russia
- Millennium Institute for Subatomic Physics at High-Energy Frontier (SAPHIR), Fernandez Concha 700, Santiago, Chile
| | - V Lysan
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
| | - L Marsicano
- INFN, Sezione di Genova, 16147 Genova, Italia
| | - V A Matveev
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
| | - Yu V Mikhailov
- State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center 'Kurchatov Institute' (IHEP), 142281 Protvino, Russia
| | - L Molina Bueno
- ETH Zürich, Institute for Particle Physics and Astrophysics, CH-8093 Zürich, Switzerland
- Instituto de Fisica Corpuscular (CSIC/UV), Carrer del Catedrátic José Beltrán Martinez, 2, 46980 Paterna, Valencia
| | | | - V A Polyakov
- State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center 'Kurchatov Institute' (IHEP), 142281 Protvino, Russia
| | - B Radics
- ETH Zürich, Institute for Particle Physics and Astrophysics, CH-8093 Zürich, Switzerland
| | - A Rubbia
- ETH Zürich, Institute for Particle Physics and Astrophysics, CH-8093 Zürich, Switzerland
| | - K M Samalantin
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
| | - V D Samoylenko
- State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center 'Kurchatov Institute' (IHEP), 142281 Protvino, Russia
| | - H Sieber
- ETH Zürich, Institute for Particle Physics and Astrophysics, CH-8093 Zürich, Switzerland
| | - D Shchukin
- P.N.Lebedev Physical Institute of the Russian Academy of Sciences, 119 991 Moscow, Russia
| | - O Soto
- Millennium Institute for Subatomic Physics at High-Energy Frontier (SAPHIR), Fernandez Concha 700, Santiago, Chile
- Departamento de Física, Facultad de Ciencias, Universidad de La Serena, Avenida Cisternas 1200, La Serena, Chile
| | - V O Tikhomirov
- P.N.Lebedev Physical Institute of the Russian Academy of Sciences, 119 991 Moscow, Russia
| | - I V Tlisova
- Institute for Nuclear Research, 117312 Moscow, Russia
| | - A N Toropin
- Institute for Nuclear Research, 117312 Moscow, Russia
| | | | - P V Volkov
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
- Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - V Yu Volkov
- Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119991 Moscow, Russia
| | | | - J Zamora-Saá
- Center for Theoretical and Experimental Particle Physics, Facultad de Ciencias Exactas, Universidad Andres Bello, Fernandez Concha 700, Santiago, Chile
- Millennium Institute for Subatomic Physics at High-Energy Frontier (SAPHIR), Fernandez Concha 700, Santiago, Chile
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4
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Kling F, Quílez P. ALP searches at the LHC: FASER as a light-shining-through-walls experiment. Int J Clin Exp Med 2022. [DOI: 10.1103/physrevd.106.055036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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5
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Cazzaniga C, Odagiu P, Depero E, Molina Bueno L, Andreev YM, Banerjee D, Bernhard J, Burtsev VE, Charitonidis N, Chumakov AG, Cooke D, Crivelli P, Dermenev AV, Donskov SV, Dusaev RR, Enik T, Feshchenko A, Frolov VN, Gardikiotis A, Gerassimov SG, Girod S, Gninenko SN, Hösgen M, Kachanov VA, Karneyeu AE, Kekelidze G, Ketzer B, Kirpichnikov DV, Kirsanov MM, Kolosov VN, Konorov IV, Kovalenko SG, Kramarenko VA, Kravchuk LV, Krasnikov NV, Kuleshov SV, Lyubovitskij VE, Lysan V, Matveev VA, Mikhailov YV, Peshekhonov DV, Polyakov VA, Radics B, Rojas R, Rubbia A, Samoylenko VD, Shchukin D, Sieber H, Tikhomirov VO, Tlisova IV, Tlisov DA, Toropin AN, Trifonov AY, Vasilishin BI, Arenas GV, Volkov PV, Volkov VY, Ulloa P. Probing the explanation of the muon (g-2) anomaly and thermal light dark matter with the semi-visible dark photon channel. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS 2021; 81:959. [PMID: 34790033 PMCID: PMC8557162 DOI: 10.1140/epjc/s10052-021-09705-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2021] [Accepted: 09/30/2021] [Indexed: 05/28/2023]
Abstract
We report the results of a search for a new vector boson ( A ' ) decaying into two dark matter particlesχ 1 χ 2 of different mass. The heavier χ 2 particle subsequently decays to χ 1 and an off-shell Dark PhotonA ' ∗ → e + e - . For a sufficiently large mass splitting, this model can explain in terms of new physics the recently confirmed discrepancy observed in the muon anomalous magnetic moment at Fermilab. Remarkably, it also predicts the observed yield of thermal dark matter relic abundance. A detailed Monte-Carlo simulation was used to determine the signal yield and detection efficiency for this channel in the NA64 setup. The results were obtained re-analyzing the previous NA64 searches for an invisible decayA ' → χ χ ¯ and axion-like or pseudo-scalar particles a → γ γ . With this method, we exclude a significant portion of the parameter space justifying the muon g-2 anomaly and being compatible with the observed dark matter relic density for A ' masses from 2 m e up to 390 MeV and mixing parameter ε between 3 × 10 - 5 and 2 × 10 - 2 .
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Affiliation(s)
- C. Cazzaniga
- ETH Zürich Institute for Particle Physics and Astrophysics, 8093 Zurich, Switzerland
| | - P. Odagiu
- ETH Zürich Institute for Particle Physics and Astrophysics, 8093 Zurich, Switzerland
- Institute of Physics, École polytechnique fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - E. Depero
- ETH Zürich Institute for Particle Physics and Astrophysics, 8093 Zurich, Switzerland
| | - L. Molina Bueno
- ETH Zürich Institute for Particle Physics and Astrophysics, 8093 Zurich, Switzerland
- Instituto de Fisica Corpuscular (CSIC/UV), Carrer del Catedrátic José Beltrán Martinez, 2, 46980 Paterna, Valencia Spain
| | | | - D. Banerjee
- CERN, EN-EA, 1211 Geneva 23, Switzerland
- University of Illinois at Urbana Champaign, Urbana, IL 61801-3080 USA
| | | | - V. E. Burtsev
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
| | | | - A. G. Chumakov
- Tomsk State Pedagogical University, 634061 Tomsk, Russia
- Tomsk Polytechnic University, 634050 Tomsk, Russia
| | - D. Cooke
- UCL Departement of Physics and Astronomy, University College London, Gower St., London, WC1E 6BT UK
| | - P. Crivelli
- ETH Zürich Institute for Particle Physics and Astrophysics, 8093 Zurich, Switzerland
| | | | - S. V. Donskov
- State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center ‘Kurchatov Institute’ (IHEP), 142281 Protvino, Russia
| | - R. R. Dusaev
- Tomsk Polytechnic University, 634050 Tomsk, Russia
| | - T. Enik
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
| | - A. Feshchenko
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
| | - V. N. Frolov
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
| | - A. Gardikiotis
- Physics Department, University of Patras, 265 04 Patras, Greece
| | - S. G. Gerassimov
- Physik Department, Technische Universität München, 85748 Garching, Germany
- P.N. Lebedev Physical Institute, 119 991 Moscow, Russia
| | - S. Girod
- CERN, EN-EA, 1211 Geneva 23, Switzerland
| | | | - M. Hösgen
- Helmholtz-Institut für Strahlen-und Kernphysik, Universität Bonn, 53115 Bonn, Germany
| | - V. A. Kachanov
- State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center ‘Kurchatov Institute’ (IHEP), 142281 Protvino, Russia
| | | | - G. Kekelidze
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
| | - B. Ketzer
- Helmholtz-Institut für Strahlen-und Kernphysik, Universität Bonn, 53115 Bonn, Germany
| | | | | | - V. N. Kolosov
- State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center ‘Kurchatov Institute’ (IHEP), 142281 Protvino, Russia
| | - I. V. Konorov
- Physik Department, Technische Universität München, 85748 Garching, Germany
- P.N. Lebedev Physical Institute, 119 991 Moscow, Russia
| | - S. G. Kovalenko
- Departamento de Ciencias Físicas, Universidad Andres Bello, Sazié 2212, Piso 7, Santiago, Chile
- Millennium Institute for Subatomic Physics at the High-Energy Frontier (SAPHIR), ICN2019_044, ANID, Santiago, Chile
| | - V. A. Kramarenko
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
- Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119991 Moscow, Russia
| | | | - N. V. Krasnikov
- Institute for Nuclear Research, 117312 Moscow, Russia
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
| | - S. V. Kuleshov
- Departamento de Ciencias Físicas, Universidad Andres Bello, Sazié 2212, Piso 7, Santiago, Chile
- Millennium Institute for Subatomic Physics at the High-Energy Frontier (SAPHIR), ICN2019_044, ANID, Santiago, Chile
| | - V. E. Lyubovitskij
- Tomsk State Pedagogical University, 634061 Tomsk, Russia
- Tomsk Polytechnic University, 634050 Tomsk, Russia
- Millennium Institute for Subatomic Physics at the High-Energy Frontier (SAPHIR), ICN2019_044, ANID, Santiago, Chile
- Universidad Técnica Federico Santa María, 2390123 Valparaiso, Chile
| | - V. Lysan
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
| | - V. A. Matveev
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
| | - Yu. V. Mikhailov
- State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center ‘Kurchatov Institute’ (IHEP), 142281 Protvino, Russia
| | | | - V. A. Polyakov
- State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center ‘Kurchatov Institute’ (IHEP), 142281 Protvino, Russia
| | - B. Radics
- ETH Zürich Institute for Particle Physics and Astrophysics, 8093 Zurich, Switzerland
| | - R. Rojas
- Universidad Técnica Federico Santa María, 2390123 Valparaiso, Chile
| | - A. Rubbia
- ETH Zürich Institute for Particle Physics and Astrophysics, 8093 Zurich, Switzerland
| | - V. D. Samoylenko
- State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center ‘Kurchatov Institute’ (IHEP), 142281 Protvino, Russia
| | - D. Shchukin
- P.N. Lebedev Physical Institute, 119 991 Moscow, Russia
| | - H. Sieber
- ETH Zürich Institute for Particle Physics and Astrophysics, 8093 Zurich, Switzerland
| | | | - I. V. Tlisova
- Institute for Nuclear Research, 117312 Moscow, Russia
| | - D. A. Tlisov
- Institute for Nuclear Research, 117312 Moscow, Russia
| | - A. N. Toropin
- Institute for Nuclear Research, 117312 Moscow, Russia
| | - A. Yu. Trifonov
- Tomsk State Pedagogical University, 634061 Tomsk, Russia
- Tomsk Polytechnic University, 634050 Tomsk, Russia
| | | | | | - P. V. Volkov
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
- Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - V. Yu. Volkov
- Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - P. Ulloa
- Departamento de Ciencias Físicas, Universidad Andres Bello, Sazié 2212, Piso 7, Santiago, Chile
| | - NA64 Collaboration
- ETH Zürich Institute for Particle Physics and Astrophysics, 8093 Zurich, Switzerland
- Institute of Physics, École polytechnique fédérale de Lausanne (EPFL), Lausanne, Switzerland
- Instituto de Fisica Corpuscular (CSIC/UV), Carrer del Catedrátic José Beltrán Martinez, 2, 46980 Paterna, Valencia Spain
- Institute for Nuclear Research, 117312 Moscow, Russia
- CERN, EN-EA, 1211 Geneva 23, Switzerland
- University of Illinois at Urbana Champaign, Urbana, IL 61801-3080 USA
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
- Tomsk State Pedagogical University, 634061 Tomsk, Russia
- UCL Departement of Physics and Astronomy, University College London, Gower St., London, WC1E 6BT UK
- State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center ‘Kurchatov Institute’ (IHEP), 142281 Protvino, Russia
- Tomsk Polytechnic University, 634050 Tomsk, Russia
- Physics Department, University of Patras, 265 04 Patras, Greece
- Physik Department, Technische Universität München, 85748 Garching, Germany
- P.N. Lebedev Physical Institute, 119 991 Moscow, Russia
- Helmholtz-Institut für Strahlen-und Kernphysik, Universität Bonn, 53115 Bonn, Germany
- Departamento de Ciencias Físicas, Universidad Andres Bello, Sazié 2212, Piso 7, Santiago, Chile
- Millennium Institute for Subatomic Physics at the High-Energy Frontier (SAPHIR), ICN2019_044, ANID, Santiago, Chile
- Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119991 Moscow, Russia
- Universidad Técnica Federico Santa María, 2390123 Valparaiso, Chile
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6
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Andreev YM, Banerjee D, Bernhard J, Burtsev VE, Chumakov AG, Cooke D, Crivelli P, Depero E, Dermenev AV, Donskov SV, Dusaev RR, Enik T, Charitonidis N, Feshchenko A, Frolov VN, Gardikiotis A, Gerassimov SG, Gninenko SN, Hösgen M, Kachanov VA, Karneyeu AE, Kekelidze G, Ketzer B, Kirpichnikov DV, Kirsanov MM, Kolosov VN, Konorov IV, Kovalenko SG, Kramarenko VA, Kravchuk LV, Krasnikov NV, Kuleshov SV, Lyubovitskij VE, Lysan V, Matveev VA, Mikhailov YV, Molina Bueno L, Peshekhonov DV, Polyakov VA, Radics B, Rojas R, Rubbia A, Samoylenko VD, Sieber H, Shchukin D, Tikhomirov VO, Tlisova I, Toropin AN, Trifonov AY, Vasilishin BI, Volkov PV, Volkov VY. Constraints on New Physics in Electron g-2 from a Search for Invisible Decays of a Scalar, Pseudoscalar, Vector, and Axial Vector. PHYSICAL REVIEW LETTERS 2021; 126:211802. [PMID: 34114842 DOI: 10.1103/physrevlett.126.211802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2021] [Accepted: 04/16/2021] [Indexed: 06/12/2023]
Abstract
We performed a search for a new generic X boson, which could be a scalar (S), pseudoscalar (P), vector (V), or an axial vector (A) particle produced in the 100 GeV electron scattering off nuclei, e^{-}Z→e^{-}ZX, followed by its invisible decay in the NA64 experiment at CERN. No evidence for such a process was found in the full NA64 dataset of 2.84×10^{11} electrons on target. We place new bounds on the S, P, V, A coupling strengths to electrons, and set constraints on their contributions to the electron anomalous magnetic moment a_{e}, |Δa_{X}|≲10^{-15}-10^{-13} for the X mass region 1 MeV≲m_{X}≲1 GeV. These results are an order of magnitude more sensitive compared to the current accuracy on a_{e} from the electron g-2 experiments and recent high-precision determination of the fine structure constant.
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Affiliation(s)
- Yu M Andreev
- Institute for Nuclear Research, 117312 Moscow, Russia
| | - D Banerjee
- CERN, European Organization for Nuclear Research, CH-1211 Geneva 23, Switzerland
| | - J Bernhard
- CERN, European Organization for Nuclear Research, CH-1211 Geneva 23, Switzerland
| | - V E Burtsev
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
| | - A G Chumakov
- Tomsk Polytechnic University, 634050 Tomsk, Russia
- Tomsk State Pedagogical University, 634061 Tomsk, Russia
| | - D Cooke
- UCL Departement of Physics and Astronomy, University College London, Gower Street London WC1E 6BT, United Kingdom
| | - P Crivelli
- ETH Zürich, Institute for Particle Physics and Astrophysics, CH-8093 Zürich, Switzerland
| | - E Depero
- ETH Zürich, Institute for Particle Physics and Astrophysics, CH-8093 Zürich, Switzerland
| | - A V Dermenev
- Institute for Nuclear Research, 117312 Moscow, Russia
| | - S V Donskov
- State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center "Kurchatov Institute" (IHEP), 142281 Protvino, Russia
| | - R R Dusaev
- Tomsk Polytechnic University, 634050 Tomsk, Russia
| | - T Enik
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
| | - N Charitonidis
- CERN, European Organization for Nuclear Research, CH-1211 Geneva 23, Switzerland
| | - A Feshchenko
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
| | - V N Frolov
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
| | - A Gardikiotis
- Physics Department, University of Patras, 265 04 Patras, Greece
| | - S G Gerassimov
- Technische Universität München, Physik Department, 85748 Garching, Germany
- P.N. Lebedev Physical Institute, Moscow, Russia, 119 991 Moscow, Russia
| | - S N Gninenko
- Institute for Nuclear Research, 117312 Moscow, Russia
| | - M Hösgen
- Universität Bonn, Helmholtz-Institut für Strahlen-und Kernphysik, 53115 Bonn, Germany
| | - V A Kachanov
- State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center "Kurchatov Institute" (IHEP), 142281 Protvino, Russia
| | - A E Karneyeu
- Institute for Nuclear Research, 117312 Moscow, Russia
| | - G Kekelidze
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
| | - B Ketzer
- Universität Bonn, Helmholtz-Institut für Strahlen-und Kernphysik, 53115 Bonn, Germany
| | | | - M M Kirsanov
- Institute for Nuclear Research, 117312 Moscow, Russia
| | - V N Kolosov
- State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center "Kurchatov Institute" (IHEP), 142281 Protvino, Russia
| | - I V Konorov
- Technische Universität München, Physik Department, 85748 Garching, Germany
- P.N. Lebedev Physical Institute, Moscow, Russia, 119 991 Moscow, Russia
| | - S G Kovalenko
- Departamento de Ciencias Físicas, Universidad Andres Bello, Sazié 2212, Piso 7, Santiago, Chile
| | - V A Kramarenko
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
- Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - L V Kravchuk
- Institute for Nuclear Research, 117312 Moscow, Russia
| | - N V Krasnikov
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
- Institute for Nuclear Research, 117312 Moscow, Russia
| | - S V Kuleshov
- Departamento de Ciencias Físicas, Universidad Andres Bello, Sazié 2212, Piso 7, Santiago, Chile
- SAPHIR Millennium Institute of ANID, 7591538 Santiago, Chile
| | - V E Lyubovitskij
- Tomsk Polytechnic University, 634050 Tomsk, Russia
- Tomsk State Pedagogical University, 634061 Tomsk, Russia
- Universidad Técnica Federico Santa María, 2390123 Valparaíso, Chile
| | - V Lysan
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
| | - V A Matveev
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
| | - Yu V Mikhailov
- State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center "Kurchatov Institute" (IHEP), 142281 Protvino, Russia
| | - L Molina Bueno
- ETH Zürich, Institute for Particle Physics and Astrophysics, CH-8093 Zürich, Switzerland
| | | | - V A Polyakov
- State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center "Kurchatov Institute" (IHEP), 142281 Protvino, Russia
| | - B Radics
- ETH Zürich, Institute for Particle Physics and Astrophysics, CH-8093 Zürich, Switzerland
| | - R Rojas
- Universidad Técnica Federico Santa María, 2390123 Valparaíso, Chile
| | - A Rubbia
- ETH Zürich, Institute for Particle Physics and Astrophysics, CH-8093 Zürich, Switzerland
| | - V D Samoylenko
- State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center "Kurchatov Institute" (IHEP), 142281 Protvino, Russia
| | - H Sieber
- ETH Zürich, Institute for Particle Physics and Astrophysics, CH-8093 Zürich, Switzerland
| | - D Shchukin
- P.N. Lebedev Physical Institute, Moscow, Russia, 119 991 Moscow, Russia
| | - V O Tikhomirov
- P.N. Lebedev Physical Institute, Moscow, Russia, 119 991 Moscow, Russia
| | - I Tlisova
- Institute for Nuclear Research, 117312 Moscow, Russia
| | - A N Toropin
- Institute for Nuclear Research, 117312 Moscow, Russia
| | - A Yu Trifonov
- Tomsk Polytechnic University, 634050 Tomsk, Russia
- Tomsk State Pedagogical University, 634061 Tomsk, Russia
| | | | - P V Volkov
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
- Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - V Yu Volkov
- Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119991 Moscow, Russia
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7
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Brdar V, Dutta B, Jang W, Kim D, Shoemaker IM, Tabrizi Z, Thompson A, Yu J. Axionlike Particles at Future Neutrino Experiments: Closing the Cosmological Triangle. PHYSICAL REVIEW LETTERS 2021; 126:201801. [PMID: 34110206 DOI: 10.1103/physrevlett.126.201801] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Accepted: 04/16/2021] [Indexed: 06/12/2023]
Abstract
Axionlike particles (ALPs) provide a promising direction in the search for new physics, while a wide range of models incorporate ALPs. We point out that future neutrino experiments, such as DUNE, possess competitive sensitivity to ALP signals. The high-intensity proton beam impinging on a target can not only produce copious amounts of neutrinos, but also cascade photons that are created from charged particle showers stopping in the target. Therefore, ALPs interacting with photons can be produced (often energetically) with high intensity via the Primakoff effect and then leave their signatures at the near detector through the inverse Primakoff scattering or decays to a photon pair. Moreover, the high-capability near detectors allow for discrimination between ALP signals and potential backgrounds, improving the signal sensitivity further. We demonstrate that a DUNE-like detector can explore a wide range of parameter space in ALP-photon coupling g_{aγ} vs ALP mass m_{a}, including some regions unconstrained by existing bounds; the "cosmological triangle" will be fully explored and the sensitivity limits would reach up to m_{a}∼3-4 GeV and down to g_{aγ}∼10^{-8} GeV^{-1}.
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Affiliation(s)
- Vedran Brdar
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
- Northwestern University, Department of Physics & Astronomy, 2145 Sheridan Road, Evanston, Illinois 60208, USA
| | - Bhaskar Dutta
- Mitchell Institute for Fundamental Physics and Astronomy, Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843, USA
| | - Wooyoung Jang
- Department of Physics, University of Texas, Arlington, Texas 76019, USA
| | - Doojin Kim
- Mitchell Institute for Fundamental Physics and Astronomy, Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843, USA
| | - Ian M Shoemaker
- Center for Neutrino Physics, Department of Physics, Virginia Tech, Blacksburg, Virginia 24061, USA
| | - Zahra Tabrizi
- Center for Neutrino Physics, Department of Physics, Virginia Tech, Blacksburg, Virginia 24061, USA
| | - Adrian Thompson
- Mitchell Institute for Fundamental Physics and Astronomy, Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843, USA
| | - Jaehoon Yu
- Department of Physics, University of Texas, Arlington, Texas 76019, USA
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8
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Depero E, Andreev YM, Banerjee D, Bernhard J, Burtsev VE, Charitonidis N, Chumakov AG, Cooke D, Crivelli P, Dermenev AV, Donskov SV, Dusaev RR, Enik T, Feshchenko A, Frolov VN, Gardikiotis A, Gerassimov SG, Girod S, Gninenko SN, Hösgen M, Kachanov VA, Karneyeu AE, Kekelidze G, Ketzer B, Kirpichnikov DV, Kirsanov MM, Kolosov VN, Konorov IV, Kovalenko SG, Kramarenko VA, Kravchuk LV, Krasnikov NV, Kuleshov SV, Lyubovitskij VE, Lysan V, Matveev VA, Mikhailov YV, Bueno LM, Peshekhonov DV, Polyakov VA, Radics B, Rojas R, Rubbia A, Samoylenko VD, Shchukin D, Sieber H, Tikhomirov VO, Tlisova VI, Tlisov DA, Toropin AN, Trifonov AY, Vasilishin BI, Arenas GV, Volkov PV, Volkov VY, Ulloa P. Hunting down the X17 boson at the CERN SPS. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS 2020; 80:1159. [PMID: 33343226 PMCID: PMC7738366 DOI: 10.1140/epjc/s10052-020-08725-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2020] [Accepted: 12/01/2020] [Indexed: 06/01/2023]
Abstract
Recently, the ATOMKI experiment has reported new evidence for the excess ofe + e - events with a mass ∼ 17 MeV in the nuclear transitions of4 He, that they previously observed in measurements with8 Be. These observations could be explained by the existence of a new vector X 17 boson. So far, the search for the decay X 17 → e + e - with the NA64 experiment at the CERN SPS gave negative results. Here, we present a new technique that could be implemented in NA64 aiming to improve the sensitivity and to cover the remaining X 17 parameter space. If a signal-like event is detected, an unambiguous observation is achieved by reconstructing the invariant mass of the X 17 decay with the proposed method. To reach this goal an optimization of the X 17 production target, as well as an efficient and accurate reconstruction of two close decay tracks, is required. A dedicated analysis of the available experimental data making use of the trackers information is presented. This method provides independent confirmation of the NA64 published results [1], validating the tracking procedure. The detailed Monte Carlo study of the proposed setup and the background estimate show that the goal of the proposed search is feasible.
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Affiliation(s)
- NA64 Collaboration
- ETH Zürich Institute for Particle Physics and Astrophysics, 8093 Zurich, Switzerland
- Institute for Nuclear Research, 117312 Moscow, Russia
- CERN, EN-EA, 1211 Geneva 23, Switzerland
- University of Illinois at Urbana Champaign, Urbana, IL 61801-3080 USA
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
- Tomsk State Pedagogical University, 634061 Tomsk, Russia
- UCL Department of Physics and Astronomy, University College London, Gower St., London, WC1E 6BT UK
- State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center ‘Kurchatov Institute’ (IHEP), 142281 Protvino, Russia
- Tomsk Polytechnic University, 634050 Tomsk, Russia
- Physics Department, University of Patras, 265 04 Patras, Greece
- Physik Department, Technische Universität München, 85748 Garching, Germany
- P.N. Lebedev Physical Institute, 119 991 Moscow, Russia
- Universität Bonn, Helmholtz-Institut für Strahlen-und Kernphysik, 53115 Bonn, Germany
- Departamento de Ciencias Físicas, Universidad Andres Bello, Sazié 2212, Piso 7, Santiago, Chile
- Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119991 Moscow, Russia
- Universidad Técnica Federico Santa María, 2390123 Valparaiso, Chile
| | - E. Depero
- ETH Zürich Institute for Particle Physics and Astrophysics, 8093 Zurich, Switzerland
| | | | - D. Banerjee
- CERN, EN-EA, 1211 Geneva 23, Switzerland
- University of Illinois at Urbana Champaign, Urbana, IL 61801-3080 USA
| | | | - V. E. Burtsev
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
| | | | - A. G. Chumakov
- Tomsk State Pedagogical University, 634061 Tomsk, Russia
| | - D. Cooke
- UCL Department of Physics and Astronomy, University College London, Gower St., London, WC1E 6BT UK
| | - P. Crivelli
- ETH Zürich Institute for Particle Physics and Astrophysics, 8093 Zurich, Switzerland
| | | | - S. V. Donskov
- State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center ‘Kurchatov Institute’ (IHEP), 142281 Protvino, Russia
| | - R. R. Dusaev
- Tomsk Polytechnic University, 634050 Tomsk, Russia
| | - T. Enik
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
| | - A. Feshchenko
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
| | - V. N. Frolov
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
| | - A. Gardikiotis
- Physics Department, University of Patras, 265 04 Patras, Greece
| | - S. G. Gerassimov
- Physik Department, Technische Universität München, 85748 Garching, Germany
- P.N. Lebedev Physical Institute, 119 991 Moscow, Russia
| | - S. Girod
- CERN, EN-EA, 1211 Geneva 23, Switzerland
| | | | - M. Hösgen
- Universität Bonn, Helmholtz-Institut für Strahlen-und Kernphysik, 53115 Bonn, Germany
| | - V. A. Kachanov
- State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center ‘Kurchatov Institute’ (IHEP), 142281 Protvino, Russia
| | | | - G. Kekelidze
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
| | - B. Ketzer
- Universität Bonn, Helmholtz-Institut für Strahlen-und Kernphysik, 53115 Bonn, Germany
| | | | | | - V. N. Kolosov
- State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center ‘Kurchatov Institute’ (IHEP), 142281 Protvino, Russia
| | - I. V. Konorov
- Physik Department, Technische Universität München, 85748 Garching, Germany
- P.N. Lebedev Physical Institute, 119 991 Moscow, Russia
| | - S. G. Kovalenko
- Departamento de Ciencias Físicas, Universidad Andres Bello, Sazié 2212, Piso 7, Santiago, Chile
| | - V. A. Kramarenko
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
- Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119991 Moscow, Russia
| | | | - N. V. Krasnikov
- Institute for Nuclear Research, 117312 Moscow, Russia
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
| | - S. V. Kuleshov
- Departamento de Ciencias Físicas, Universidad Andres Bello, Sazié 2212, Piso 7, Santiago, Chile
| | - V. E. Lyubovitskij
- Tomsk State Pedagogical University, 634061 Tomsk, Russia
- Universidad Técnica Federico Santa María, 2390123 Valparaiso, Chile
| | - V. Lysan
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
| | - V. A. Matveev
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
| | - Yu. V. Mikhailov
- State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center ‘Kurchatov Institute’ (IHEP), 142281 Protvino, Russia
| | - L. Molina Bueno
- ETH Zürich Institute for Particle Physics and Astrophysics, 8093 Zurich, Switzerland
| | | | - V. A. Polyakov
- State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center ‘Kurchatov Institute’ (IHEP), 142281 Protvino, Russia
| | - B. Radics
- ETH Zürich Institute for Particle Physics and Astrophysics, 8093 Zurich, Switzerland
| | - R. Rojas
- Universidad Técnica Federico Santa María, 2390123 Valparaiso, Chile
| | - A. Rubbia
- ETH Zürich Institute for Particle Physics and Astrophysics, 8093 Zurich, Switzerland
| | - V. D. Samoylenko
- State Scientific Center of the Russian Federation Institute for High Energy Physics of National Research Center ‘Kurchatov Institute’ (IHEP), 142281 Protvino, Russia
| | - D. Shchukin
- P.N. Lebedev Physical Institute, 119 991 Moscow, Russia
| | - H. Sieber
- ETH Zürich Institute for Particle Physics and Astrophysics, 8093 Zurich, Switzerland
| | | | - vI. Tlisova
- Institute for Nuclear Research, 117312 Moscow, Russia
| | - D. A. Tlisov
- Institute for Nuclear Research, 117312 Moscow, Russia
| | - A. N. Toropin
- Institute for Nuclear Research, 117312 Moscow, Russia
| | | | | | | | - P. V. Volkov
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
- Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - V. Yu. Volkov
- Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - P. Ulloa
- Departamento de Ciencias Físicas, Universidad Andres Bello, Sazié 2212, Piso 7, Santiago, Chile
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Abudinén F, Adachi I, Aihara H, Akopov N, Aloisio A, Ameli F, Anh Ky N, Asner DM, Aushev T, Aushev V, Babu V, Baehr S, Bahinipati S, Bambade P, Banerjee S, Bansal S, Baudot J, Becker J, Behera PK, Bennett JV, Bernieri E, Bernlochner FU, Bertemes M, Bessner M, Bettarini S, Bhardwaj V, Bianchi F, Bilka T, Bilokin S, Biswas D, Bračko M, Branchini P, Braun N, Browder TE, Budano A, Bussino S, Campajola M, Casarosa G, Cecchi C, Červenkov D, Chang MC, Chang P, Cheaib R, Chekelian V, Cheon BG, Chilikin K, Chirapatpimol K, Cho HE, Cho K, Cho SJ, Choi SK, Cinabro D, Corona L, Cremaldi LM, Cunliffe S, Dash N, Dattola F, De La Cruz-Burelo E, De Nardo G, De Nuccio M, De Pietro G, de Sangro R, Destefanis M, De Yta-Hernandez A, Di Capua F, Doležal Z, Dong TV, Dort K, Dossett D, Dujany G, Eidelman S, Ferber T, Ferlewicz D, Fiore S, Fodor A, Forti F, Fulsom BG, Ganiev E, Garg R, Garmash A, Gaur V, Gaz A, Gebauer U, Gellrich A, Geßler T, Giordano R, Giri A, Gobbo B, Godang R, Goldenzweig P, Golob B, Gomis P, Gradl W, Graziani E, Greenwald D, Hadjivasiliou C, Halder S, Hartbrich O, Hayasaka K, Hayashii H, Hearty C, Hedges MT, Heredia de la Cruz I, Hernández Villanueva M, Hershenhorn A, Higuchi T, Hill EC, Hirata H, Hoek M, Hohmann M, Hsu CL, Hu Y, Inami K, Inguglia G, Irakkathil Jabbar J, Ishikawa A, Itoh R, Jackson P, Jacobs WW, Jaffe DE, Jang EJ, Jia S, Jin Y, Joo C, Kaliyar AB, Kandra J, Karyan G, Kato Y, Kichimi H, Kiesling C, Kim CH, Kim DY, Kim HJ, Kim SH, Kim YK, Kimmel TD, Kinoshita K, Kleinwort C, Kodyš P, Koga T, Kohani S, Komarov I, Korpar S, Kraetzschmar TMG, Križan P, Krokovny P, Kuhr T, Kumar M, Kumar R, Kumara K, Kurz S, Kwon YJ, Lacaprara S, La Licata C, Lanceri L, Lange JS, Lee IS, Lee SC, Leitl P, Levit D, Lewis PM, Li C, Li LK, Li YB, Libby J, Lieret K, Li Gioi L, Liptak Z, Liu QY, Liventsev D, Longo S, Luo T, MacQueen C, Maeda Y, Manfredi R, Manoni E, Marcello S, Marinas C, Martini A, Masuda M, Matsuoka K, Matvienko D, Meggendorfer F, Meier F, Merola M, Metzner F, Milesi M, Miller C, Miyabayashi K, Mizuk R, Azmi K, Mohanty GB, Moser HG, Mrvar M, Müller FJ, Mussa R, Nakamura I, Nakao M, Nakazawa H, Natochii A, Niebuhr C, Nisar NK, Nishida S, Nouxman MHA, Ogawa K, Ogawa S, Ono H, Oskin P, Ozaki H, Pakhlov P, Paladino A, Panta A, Paoloni E, Pardi S, Park H, Park SH, Paschen B, Passeri A, Pathak A, Patra S, Paul S, Pedlar TK, Peruzzi I, Peschke R, Piccolo M, Piilonen LE, Polat G, Popov V, Praz C, Prencipe E, Prim MT, Purohit MV, Rad N, Rados P, Rasheed R, Reif M, Reiter S, Remnev M, Ripp-Baudot I, Ritter M, Ritzert M, Rizzo G, Robertson SH, Rodríguez Pérez D, Roney JM, Rosenfeld C, Rostomyan A, Rout N, Sahoo D, Sakai Y, Sanders DA, Sandilya S, Sangal A, Santelj L, Sato Y, Savinov V, Scavino B, Schwanda C, Schwartz AJ, Seddon RM, Seino Y, Selce A, Senyo K, Serrano J, Sevior ME, Sfienti C, Shiu JG, Sibidanov A, Simon F, Sobie RJ, Soffer A, Solovieva E, Spataro S, Spruck B, Starič M, Stefkova S, Stottler ZS, Stroili R, Strube J, Sumihama M, Sumiyoshi T, Summers DJ, Sutcliffe W, Svidras H, Tabata M, Takizawa M, Tamponi U, Tanaka S, Tanida K, Tanigawa H, Taras P, Tenchini F, Tonelli D, Torassa E, Trabelsi K, Uchida M, Uglov T, Unger K, Unno Y, Uno S, Urquijo P, Ushiroda Y, Vahsen SE, van Tonder R, Varner GS, Varvell KE, Vinokurova A, Vitale L, Waheed E, Wakai M, Wakeling HM, Wang CH, Wang MZ, Wang XL, Warburton A, Watanabe M, Watanuki S, Webb J, Wehle S, Welsch M, Wessel C, Wiechczynski J, Windel H, Won E, Wu LJ, Xu XP, Yabsley B, Yan W, Yang SB, Ye H, Yonenaga M, Yuan CZ, Yusa Y, Zani L, Zhou QD, Zhukova VI. Search for Axionlike Particles Produced in e^{+}e^{-} Collisions at Belle II. PHYSICAL REVIEW LETTERS 2020; 125:161806. [PMID: 33124872 DOI: 10.1103/physrevlett.125.161806] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2020] [Accepted: 09/08/2020] [Indexed: 06/11/2023]
Abstract
We present a search for the direct production of a light pseudoscalar a decaying into two photons with the Belle II detector at the SuperKEKB collider. We search for the process e^{+}e^{-}→γa, a→γγ in the mass range 0.2<m_{a}<9.7 GeV/c^{2} using data corresponding to an integrated luminosity of (445±3) pb^{-1}. Light pseudoscalars interacting predominantly with standard model gauge bosons (so-called axionlike particles or ALPs) are frequently postulated in extensions of the standard model. We find no evidence for ALPs and set 95% confidence level upper limits on the coupling strength g_{aγγ} of ALPs to photons at the level of 10^{-3} GeV^{-1}. The limits are the most restrictive to date for 0.2<m_{a}<1 GeV/c^{2}.
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Affiliation(s)
- F Abudinén
- INFN Sezione di Trieste, I-34127 Trieste
| | - I Adachi
- The Graduate University for Advanced Studies (SOKENDAI), Hayama 240-0193
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | - H Aihara
- Department of Physics, University of Tokyo, Tokyo 113-0033
| | - N Akopov
- Alikhanyan National Science Laboratory, Yerevan 0036
| | - A Aloisio
- INFN Sezione di Napoli, I-80126 Napoli
- Dipartimento di Scienze Fisiche, Università di Napoli Federico II, I-80126 Napoli
| | - F Ameli
- INFN Sezione di Roma, I-00185 Roma
| | - N Anh Ky
- Institute of Theoretical and Applied Research (ITAR), Duy Tan University, Hanoi 100000
- Institute of Physics, Vietnam Academy of Science and Technology (VAST), Hanoi
| | - D M Asner
- Brookhaven National Laboratory, Upton, New York 11973
| | - T Aushev
- Higher School of Economics (HSE), Moscow 101000
| | - V Aushev
- Taras Shevchenko National University of Kiev, Kiev
| | - V Babu
- Deutsches Elektronen-Synchrotron, 22607 Hamburg
| | - S Baehr
- Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe
| | - S Bahinipati
- Indian Institute of Technology Bhubaneswar, Satya Nagar 751007
| | - P Bambade
- Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay
| | - Sw Banerjee
- University of Louisville, Louisville, Kentucky 40292
| | - S Bansal
- Panjab University, Chandigarh 160014
| | - J Baudot
- Université de Strasbourg, CNRS, IPHC, UMR 7178, 67037 Strasbourg
| | - J Becker
- Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe
| | - P K Behera
- Indian Institute of Technology Madras, Chennai 600036
| | - J V Bennett
- University of Mississippi, University, Mississippi 38677
| | | | | | - M Bertemes
- Institute of High Energy Physics, Vienna 1050
| | - M Bessner
- University of Hawaii, Honolulu, Hawaii 96822
| | - S Bettarini
- INFN Sezione di Pisa, I-56127 Pisa
- Dipartimento di Fisica, Università di Pisa, I-56127 Pisa
| | - V Bhardwaj
- Indian Institute of Science Education and Research Mohali, SAS Nagar, 140306
| | - F Bianchi
- INFN Sezione di Torino, I-10125 Torino
- Dipartimento di Fisica, Università di Torino, I-10125 Torino
| | - T Bilka
- Faculty of Mathematics and Physics, Charles University, 121 16 Prague
| | - S Bilokin
- Ludwig Maximilians University, 80539 Munich
| | - D Biswas
- University of Louisville, Louisville, Kentucky 40292
| | - M Bračko
- J. Stefan Institute, 1000 Ljubljana
- University of Maribor, 2000 Maribor
| | | | - N Braun
- Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe
| | - T E Browder
- University of Hawaii, Honolulu, Hawaii 96822
| | - A Budano
- INFN Sezione di Roma Tre, I-00146 Roma
| | - S Bussino
- INFN Sezione di Roma Tre, I-00146 Roma
- Dipartimento di Matematica e Fisica, Università di Roma Tre, I-00146 Roma
| | - M Campajola
- INFN Sezione di Napoli, I-80126 Napoli
- Dipartimento di Scienze Fisiche, Università di Napoli Federico II, I-80126 Napoli
| | - G Casarosa
- INFN Sezione di Pisa, I-56127 Pisa
- Dipartimento di Fisica, Università di Pisa, I-56127 Pisa
| | - C Cecchi
- INFN Sezione di Perugia, I-06123 Perugia
- Dipartimento di Fisica, Università di Perugia, I-06123 Perugia
| | - D Červenkov
- Faculty of Mathematics and Physics, Charles University, 121 16 Prague
| | - M-C Chang
- Department of Physics, Fu Jen Catholic University, Taipei 24205
| | - P Chang
- Department of Physics, National Taiwan University, Taipei 10617
| | - R Cheaib
- University of British Columbia, Vancouver, British Columbia V6T 1Z1
| | - V Chekelian
- Max-Planck-Institut für Physik, 80805 München
| | - B G Cheon
- Department of Physics and Institute of Natural Sciences, Hanyang University, Seoul 04763
| | - K Chilikin
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
| | | | - H-E Cho
- Department of Physics and Institute of Natural Sciences, Hanyang University, Seoul 04763
| | - K Cho
- Korea Institute of Science and Technology Information, Daejeon 34141
| | - S-J Cho
- Yonsei University, Seoul 03722
| | - S-K Choi
- Gyeongsang National University, Jinju 52828
| | - D Cinabro
- Wayne State University, Detroit, Michigan 48202
| | - L Corona
- INFN Sezione di Pisa, I-56127 Pisa
- Dipartimento di Fisica, Università di Pisa, I-56127 Pisa
| | - L M Cremaldi
- University of Mississippi, University, Mississippi 38677
| | - S Cunliffe
- Deutsches Elektronen-Synchrotron, 22607 Hamburg
| | - N Dash
- Indian Institute of Technology Madras, Chennai 600036
| | - F Dattola
- Deutsches Elektronen-Synchrotron, 22607 Hamburg
| | - E De La Cruz-Burelo
- Centro de Investigacion y de Estudios Avanzados del Instituto Politecnico Nacional, Mexico City 07360
| | - G De Nardo
- INFN Sezione di Napoli, I-80126 Napoli
- Dipartimento di Scienze Fisiche, Università di Napoli Federico II, I-80126 Napoli
| | - M De Nuccio
- Deutsches Elektronen-Synchrotron, 22607 Hamburg
| | | | - R de Sangro
- INFN Laboratori Nazionali di Frascati, I-00044 Frascati
| | - M Destefanis
- INFN Sezione di Torino, I-10125 Torino
- Dipartimento di Fisica, Università di Torino, I-10125 Torino
| | - A De Yta-Hernandez
- Centro de Investigacion y de Estudios Avanzados del Instituto Politecnico Nacional, Mexico City 07360
| | - F Di Capua
- INFN Sezione di Napoli, I-80126 Napoli
- Dipartimento di Scienze Fisiche, Università di Napoli Federico II, I-80126 Napoli
| | - Z Doležal
- Faculty of Mathematics and Physics, Charles University, 121 16 Prague
| | - T V Dong
- Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics, Fudan University, Shanghai 200443
| | - K Dort
- Justus-Liebig-Universität Gießen, 35392 Gießen
| | - D Dossett
- School of Physics, University of Melbourne, Victoria 3010
| | - G Dujany
- Université de Strasbourg, CNRS, IPHC, UMR 7178, 67037 Strasbourg
| | - S Eidelman
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
- Novosibirsk State University, Novosibirsk 630090
| | - T Ferber
- Deutsches Elektronen-Synchrotron, 22607 Hamburg
| | - D Ferlewicz
- School of Physics, University of Melbourne, Victoria 3010
| | - S Fiore
- INFN Sezione di Roma, I-00185 Roma
| | - A Fodor
- McGill University, Montréal, Québec, H3A 2T8
| | - F Forti
- INFN Sezione di Pisa, I-56127 Pisa
- Dipartimento di Fisica, Università di Pisa, I-56127 Pisa
| | - B G Fulsom
- Pacific Northwest National Laboratory, Richland, Washington 99352
| | - E Ganiev
- INFN Sezione di Trieste, I-34127 Trieste
- Dipartimento di Fisica, Università di Trieste, I-34127 Trieste
| | - R Garg
- Panjab University, Chandigarh 160014
| | - A Garmash
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- Novosibirsk State University, Novosibirsk 630090
| | - V Gaur
- Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
| | - A Gaz
- Graduate School of Science, Nagoya University, Nagoya 464-8602
- Kobayashi-Maskawa Institute, Nagoya University, Nagoya 464-8602
| | - U Gebauer
- II. Physikalisches Institut, Georg-August-Universität Göttingen, 37073 Göttingen
| | - A Gellrich
- Deutsches Elektronen-Synchrotron, 22607 Hamburg
| | - T Geßler
- Justus-Liebig-Universität Gießen, 35392 Gießen
| | - R Giordano
- INFN Sezione di Napoli, I-80126 Napoli
- Dipartimento di Scienze Fisiche, Università di Napoli Federico II, I-80126 Napoli
| | - A Giri
- Indian Institute of Technology Hyderabad, Telangana 502285
| | - B Gobbo
- INFN Sezione di Trieste, I-34127 Trieste
| | - R Godang
- University of South Alabama, Mobile, Alabama 36688
| | - P Goldenzweig
- Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe
| | - B Golob
- J. Stefan Institute, 1000 Ljubljana
- Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana
| | - P Gomis
- Instituto de Fisica Corpuscular, Paterna 46980
| | - W Gradl
- Johannes Gutenberg-Universität Mainz, Institut für Kernphysik, D-55099 Mainz
| | | | - D Greenwald
- Department of Physics, Technische Universität München, 85748 Garching
| | - C Hadjivasiliou
- Pacific Northwest National Laboratory, Richland, Washington 99352
| | - S Halder
- Tata Institute of Fundamental Research, Mumbai 400005
| | - O Hartbrich
- University of Hawaii, Honolulu, Hawaii 96822
| | | | | | - C Hearty
- Institute of Particle Physics (Canada), Victoria, British Columbia V8W 2Y2
- University of British Columbia, Vancouver, British Columbia V6T 1Z1
| | - M T Hedges
- University of Hawaii, Honolulu, Hawaii 96822
| | - I Heredia de la Cruz
- Centro de Investigacion y de Estudios Avanzados del Instituto Politecnico Nacional, Mexico City 07360
- Consejo Nacional de Ciencia y Tecnología, Mexico City 03940
| | | | - A Hershenhorn
- University of British Columbia, Vancouver, British Columbia V6T 1Z1
| | - T Higuchi
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), University of Tokyo, Kashiwa 277-8583
| | - E C Hill
- University of British Columbia, Vancouver, British Columbia V6T 1Z1
| | - H Hirata
- Graduate School of Science, Nagoya University, Nagoya 464-8602
| | - M Hoek
- Johannes Gutenberg-Universität Mainz, Institut für Kernphysik, D-55099 Mainz
| | - M Hohmann
- School of Physics, University of Melbourne, Victoria 3010
| | - C-L Hsu
- School of Physics, University of Sydney, New South Wales 2006
| | - Y Hu
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049
| | - K Inami
- Graduate School of Science, Nagoya University, Nagoya 464-8602
| | - G Inguglia
- Institute of High Energy Physics, Vienna 1050
| | - J Irakkathil Jabbar
- Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe
| | - A Ishikawa
- The Graduate University for Advanced Studies (SOKENDAI), Hayama 240-0193
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | - R Itoh
- The Graduate University for Advanced Studies (SOKENDAI), Hayama 240-0193
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | - P Jackson
- Department of Physics, University of Adelaide, Adelaide, South Australia 5005
| | - W W Jacobs
- Indiana University, Bloomington, Indiana 47408
| | - D E Jaffe
- Brookhaven National Laboratory, Upton, New York 11973
| | - E-J Jang
- Gyeongsang National University, Jinju 52828
| | - S Jia
- Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics, Fudan University, Shanghai 200443
| | - Y Jin
- INFN Sezione di Trieste, I-34127 Trieste
| | - C Joo
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), University of Tokyo, Kashiwa 277-8583
| | - A B Kaliyar
- Tata Institute of Fundamental Research, Mumbai 400005
| | - J Kandra
- Faculty of Mathematics and Physics, Charles University, 121 16 Prague
| | - G Karyan
- Alikhanyan National Science Laboratory, Yerevan 0036
| | - Y Kato
- Graduate School of Science, Nagoya University, Nagoya 464-8602
- Kobayashi-Maskawa Institute, Nagoya University, Nagoya 464-8602
| | - H Kichimi
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | - C Kiesling
- Max-Planck-Institut für Physik, 80805 München
| | - C-H Kim
- Department of Physics and Institute of Natural Sciences, Hanyang University, Seoul 04763
| | - D Y Kim
- Soongsil University, Seoul 06978
| | - H J Kim
- Kyungpook National University, Daegu 41566
| | - S-H Kim
- Seoul National University, Seoul 08826
| | - Y-K Kim
- Yonsei University, Seoul 03722
| | - T D Kimmel
- Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
| | - K Kinoshita
- University of Cincinnati, Cincinnati, Ohio 45221
| | - C Kleinwort
- Deutsches Elektronen-Synchrotron, 22607 Hamburg
| | - P Kodyš
- Faculty of Mathematics and Physics, Charles University, 121 16 Prague
| | - T Koga
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | - S Kohani
- University of Hawaii, Honolulu, Hawaii 96822
| | - I Komarov
- Deutsches Elektronen-Synchrotron, 22607 Hamburg
| | - S Korpar
- J. Stefan Institute, 1000 Ljubljana
- University of Maribor, 2000 Maribor
| | | | - P Križan
- J. Stefan Institute, 1000 Ljubljana
- Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana
| | - P Krokovny
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- Novosibirsk State University, Novosibirsk 630090
| | - T Kuhr
- Ludwig Maximilians University, 80539 Munich
| | - M Kumar
- Malaviya National Institute of Technology Jaipur, Jaipur 302017
| | - R Kumar
- Punjab Agricultural University, Ludhiana 141004
| | - K Kumara
- Wayne State University, Detroit, Michigan 48202
| | - S Kurz
- Deutsches Elektronen-Synchrotron, 22607 Hamburg
| | | | | | - C La Licata
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), University of Tokyo, Kashiwa 277-8583
| | - L Lanceri
- INFN Sezione di Trieste, I-34127 Trieste
| | - J S Lange
- Justus-Liebig-Universität Gießen, 35392 Gießen
| | - I-S Lee
- Department of Physics and Institute of Natural Sciences, Hanyang University, Seoul 04763
| | - S C Lee
- Kyungpook National University, Daegu 41566
| | - P Leitl
- Max-Planck-Institut für Physik, 80805 München
| | - D Levit
- Department of Physics, Technische Universität München, 85748 Garching
| | | | - C Li
- Liaoning Normal University, Dalian 116029
| | - L K Li
- University of Cincinnati, Cincinnati, Ohio 45221
| | - Y B Li
- Peking University, Beijing 100871
| | - J Libby
- Indian Institute of Technology Madras, Chennai 600036
| | - K Lieret
- Ludwig Maximilians University, 80539 Munich
| | - L Li Gioi
- Max-Planck-Institut für Physik, 80805 München
| | - Z Liptak
- University of Hawaii, Honolulu, Hawaii 96822
| | - Q Y Liu
- Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics, Fudan University, Shanghai 200443
| | - D Liventsev
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
- Wayne State University, Detroit, Michigan 48202
| | - S Longo
- Deutsches Elektronen-Synchrotron, 22607 Hamburg
| | - T Luo
- Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics, Fudan University, Shanghai 200443
| | - C MacQueen
- School of Physics, University of Melbourne, Victoria 3010
| | - Y Maeda
- Graduate School of Science, Nagoya University, Nagoya 464-8602
- Kobayashi-Maskawa Institute, Nagoya University, Nagoya 464-8602
| | - R Manfredi
- INFN Sezione di Trieste, I-34127 Trieste
- Dipartimento di Fisica, Università di Trieste, I-34127 Trieste
| | - E Manoni
- INFN Sezione di Perugia, I-06123 Perugia
| | - S Marcello
- INFN Sezione di Torino, I-10125 Torino
- Dipartimento di Fisica, Università di Torino, I-10125 Torino
| | - C Marinas
- Instituto de Fisica Corpuscular, Paterna 46980
| | - A Martini
- INFN Sezione di Roma Tre, I-00146 Roma
- Dipartimento di Matematica e Fisica, Università di Roma Tre, I-00146 Roma
| | - M Masuda
- Earthquake Research Institute, University of Tokyo, Tokyo 113-0032
- Research Center for Nuclear Physics, Osaka University, Osaka 567-0047
| | - K Matsuoka
- Graduate School of Science, Nagoya University, Nagoya 464-8602
- Kobayashi-Maskawa Institute, Nagoya University, Nagoya 464-8602
| | - D Matvienko
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
- Novosibirsk State University, Novosibirsk 630090
| | | | - F Meier
- Duke University, Durham, North Carolina 27708
| | - M Merola
- INFN Sezione di Napoli, I-80126 Napoli
- Dipartimento di Agraria, Università di Napoli Federico II, I-80055 Portici (NA)
| | - F Metzner
- Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe
| | - M Milesi
- School of Physics, University of Melbourne, Victoria 3010
| | - C Miller
- University of Victoria, Victoria, British Columbia V8W 3P6
| | | | - R Mizuk
- Higher School of Economics (HSE), Moscow 101000
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
| | - K Azmi
- National Centre for Particle Physics, University Malaya, 50603 Kuala Lumpur
| | - G B Mohanty
- Tata Institute of Fundamental Research, Mumbai 400005
| | - H-G Moser
- Max-Planck-Institut für Physik, 80805 München
| | - M Mrvar
- Institute of High Energy Physics, Vienna 1050
| | - F J Müller
- Deutsches Elektronen-Synchrotron, 22607 Hamburg
| | - R Mussa
- INFN Sezione di Torino, I-10125 Torino
| | - I Nakamura
- The Graduate University for Advanced Studies (SOKENDAI), Hayama 240-0193
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | - M Nakao
- The Graduate University for Advanced Studies (SOKENDAI), Hayama 240-0193
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | - H Nakazawa
- Department of Physics, National Taiwan University, Taipei 10617
| | - A Natochii
- University of Hawaii, Honolulu, Hawaii 96822
| | - C Niebuhr
- Deutsches Elektronen-Synchrotron, 22607 Hamburg
| | - N K Nisar
- Brookhaven National Laboratory, Upton, New York 11973
| | - S Nishida
- The Graduate University for Advanced Studies (SOKENDAI), Hayama 240-0193
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | - M H A Nouxman
- National Centre for Particle Physics, University Malaya, 50603 Kuala Lumpur
| | - K Ogawa
- Niigata University, Niigata 950-2181
| | - S Ogawa
- Toho University, Funabashi 274-8510
| | - H Ono
- Niigata University, Niigata 950-2181
| | - P Oskin
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
| | - H Ozaki
- The Graduate University for Advanced Studies (SOKENDAI), Hayama 240-0193
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | - P Pakhlov
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
- Moscow Physical Engineering Institute, Moscow 115409
| | - A Paladino
- INFN Sezione di Pisa, I-56127 Pisa
- Dipartimento di Fisica, Università di Pisa, I-56127 Pisa
| | - A Panta
- University of Mississippi, University, Mississippi 38677
| | - E Paoloni
- INFN Sezione di Pisa, I-56127 Pisa
- Dipartimento di Fisica, Università di Pisa, I-56127 Pisa
| | - S Pardi
- INFN Sezione di Napoli, I-80126 Napoli
| | - H Park
- Kyungpook National University, Daegu 41566
| | | | | | - A Passeri
- INFN Sezione di Roma Tre, I-00146 Roma
| | - A Pathak
- University of Louisville, Louisville, Kentucky 40292
| | - S Patra
- Indian Institute of Science Education and Research Mohali, SAS Nagar, 140306
| | - S Paul
- Department of Physics, Technische Universität München, 85748 Garching
| | | | - I Peruzzi
- INFN Laboratori Nazionali di Frascati, I-00044 Frascati
| | - R Peschke
- University of Hawaii, Honolulu, Hawaii 96822
| | - M Piccolo
- INFN Laboratori Nazionali di Frascati, I-00044 Frascati
| | - L E Piilonen
- Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
| | - G Polat
- Aix Marseille Université, CNRS/IN2P3, CPPM, 13288 Marseille
| | - V Popov
- Higher School of Economics (HSE), Moscow 101000
| | - C Praz
- Deutsches Elektronen-Synchrotron, 22607 Hamburg
| | | | - M T Prim
- Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe
| | - M V Purohit
- Okinawa Institute of Science and Technology, Okinawa 904-0495
| | - N Rad
- Deutsches Elektronen-Synchrotron, 22607 Hamburg
| | - P Rados
- Deutsches Elektronen-Synchrotron, 22607 Hamburg
| | - R Rasheed
- Université de Strasbourg, CNRS, IPHC, UMR 7178, 67037 Strasbourg
| | - M Reif
- Max-Planck-Institut für Physik, 80805 München
| | - S Reiter
- Justus-Liebig-Universität Gießen, 35392 Gießen
| | - M Remnev
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- Novosibirsk State University, Novosibirsk 630090
| | - I Ripp-Baudot
- Université de Strasbourg, CNRS, IPHC, UMR 7178, 67037 Strasbourg
| | - M Ritter
- Ludwig Maximilians University, 80539 Munich
| | - M Ritzert
- University of Heidelberg, 68131 Mannheim
| | - G Rizzo
- INFN Sezione di Pisa, I-56127 Pisa
- Dipartimento di Fisica, Università di Pisa, I-56127 Pisa
| | - S H Robertson
- Institute of Particle Physics (Canada), Victoria, British Columbia V8W 2Y2
- McGill University, Montréal, Québec, H3A 2T8
| | | | - J M Roney
- Institute of Particle Physics (Canada), Victoria, British Columbia V8W 2Y2
- University of Victoria, Victoria, British Columbia V8W 3P6
| | - C Rosenfeld
- University of South Carolina, Columbia, South Carolina 29208
| | - A Rostomyan
- Deutsches Elektronen-Synchrotron, 22607 Hamburg
| | - N Rout
- Indian Institute of Technology Madras, Chennai 600036
| | - D Sahoo
- Tata Institute of Fundamental Research, Mumbai 400005
| | - Y Sakai
- The Graduate University for Advanced Studies (SOKENDAI), Hayama 240-0193
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | - D A Sanders
- University of Mississippi, University, Mississippi 38677
| | - S Sandilya
- University of Cincinnati, Cincinnati, Ohio 45221
| | - A Sangal
- University of Cincinnati, Cincinnati, Ohio 45221
| | - L Santelj
- J. Stefan Institute, 1000 Ljubljana
- Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana
| | - Y Sato
- Department of Physics, Tohoku University, Sendai 980-8578
| | - V Savinov
- University of Pittsburgh, Pittsburgh, Pennsylvania 15260
| | - B Scavino
- Johannes Gutenberg-Universität Mainz, Institut für Kernphysik, D-55099 Mainz
| | - C Schwanda
- Institute of High Energy Physics, Vienna 1050
| | - A J Schwartz
- University of Cincinnati, Cincinnati, Ohio 45221
| | - R M Seddon
- McGill University, Montréal, Québec, H3A 2T8
| | - Y Seino
- Niigata University, Niigata 950-2181
| | - A Selce
- INFN Sezione di Roma, I-00185 Roma
- Università di Roma "La Sapienza," I-00185 Roma
| | - K Senyo
- Yamagata University, Yamagata 990-8560
| | - J Serrano
- Aix Marseille Université, CNRS/IN2P3, CPPM, 13288 Marseille
| | - M E Sevior
- School of Physics, University of Melbourne, Victoria 3010
| | - C Sfienti
- Johannes Gutenberg-Universität Mainz, Institut für Kernphysik, D-55099 Mainz
| | - J-G Shiu
- Department of Physics, National Taiwan University, Taipei 10617
| | - A Sibidanov
- University of Victoria, Victoria, British Columbia V8W 3P6
| | - F Simon
- Max-Planck-Institut für Physik, 80805 München
| | - R J Sobie
- Institute of Particle Physics (Canada), Victoria, British Columbia V8W 2Y2
- University of Victoria, Victoria, British Columbia V8W 3P6
| | - A Soffer
- Tel Aviv University, School of Physics and Astronomy, Tel Aviv 69978
| | - E Solovieva
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
| | - S Spataro
- INFN Sezione di Torino, I-10125 Torino
- Dipartimento di Fisica, Università di Torino, I-10125 Torino
| | - B Spruck
- Johannes Gutenberg-Universität Mainz, Institut für Kernphysik, D-55099 Mainz
| | - M Starič
- J. Stefan Institute, 1000 Ljubljana
| | - S Stefkova
- Deutsches Elektronen-Synchrotron, 22607 Hamburg
| | - Z S Stottler
- Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
| | - R Stroili
- INFN Sezione di Padova, I-35131 Padova
- Dipartimento di Fisica e Astronomia, Università di Padova, I-35131 Padova
| | - J Strube
- Pacific Northwest National Laboratory, Richland, Washington 99352
| | - M Sumihama
- Gifu University, Gifu 501-1193
- Research Center for Nuclear Physics, Osaka University, Osaka 567-0047
| | - T Sumiyoshi
- Tokyo Metropolitan University, Tokyo 192-0397
| | - D J Summers
- University of Mississippi, University, Mississippi 38677
| | | | - H Svidras
- Deutsches Elektronen-Synchrotron, 22607 Hamburg
| | - M Tabata
- Chiba University, Chiba 263-8522
| | - M Takizawa
- J-PARC Branch, KEK Theory Center, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
- Theoretical Research Division, Nishina Center, RIKEN, Saitama 351-0198
- Showa Pharmaceutical University, Tokyo 194-8543
| | - U Tamponi
- INFN Sezione di Torino, I-10125 Torino
| | - S Tanaka
- The Graduate University for Advanced Studies (SOKENDAI), Hayama 240-0193
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | - K Tanida
- Advanced Science Research Center, Japan Atomic Energy Agency, Naka 319-1195
| | - H Tanigawa
- Department of Physics, University of Tokyo, Tokyo 113-0033
| | - P Taras
- Université de Montréal, Physique des Particules, Montréal, Québec H3C 3J7
| | - F Tenchini
- Deutsches Elektronen-Synchrotron, 22607 Hamburg
| | - D Tonelli
- INFN Sezione di Trieste, I-34127 Trieste
| | - E Torassa
- INFN Sezione di Padova, I-35131 Padova
| | - K Trabelsi
- Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay
| | - M Uchida
- Tokyo Institute of Technology, Tokyo 152-8550
| | - T Uglov
- Higher School of Economics (HSE), Moscow 101000
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
| | - K Unger
- Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe
| | - Y Unno
- Department of Physics and Institute of Natural Sciences, Hanyang University, Seoul 04763
| | - S Uno
- The Graduate University for Advanced Studies (SOKENDAI), Hayama 240-0193
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | - P Urquijo
- School of Physics, University of Melbourne, Victoria 3010
| | - Y Ushiroda
- The Graduate University for Advanced Studies (SOKENDAI), Hayama 240-0193
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
- Department of Physics, University of Tokyo, Tokyo 113-0033
| | - S E Vahsen
- University of Hawaii, Honolulu, Hawaii 96822
| | | | - G S Varner
- University of Hawaii, Honolulu, Hawaii 96822
| | - K E Varvell
- School of Physics, University of Sydney, New South Wales 2006
| | - A Vinokurova
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- Novosibirsk State University, Novosibirsk 630090
| | - L Vitale
- INFN Sezione di Trieste, I-34127 Trieste
- Dipartimento di Fisica, Università di Trieste, I-34127 Trieste
| | - E Waheed
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | - M Wakai
- University of British Columbia, Vancouver, British Columbia V6T 1Z1
| | | | - C H Wang
- National United University, Miao Li 36003
| | - M-Z Wang
- Department of Physics, National Taiwan University, Taipei 10617
| | - X L Wang
- Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics, Fudan University, Shanghai 200443
| | - A Warburton
- McGill University, Montréal, Québec, H3A 2T8
| | | | - S Watanuki
- Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay
| | - J Webb
- School of Physics, University of Melbourne, Victoria 3010
| | - S Wehle
- Deutsches Elektronen-Synchrotron, 22607 Hamburg
| | | | | | | | - H Windel
- Max-Planck-Institut für Physik, 80805 München
| | - E Won
- Korea University, Seoul 02841
| | - L J Wu
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049
| | - X P Xu
- Soochow University, Suzhou 215006
| | - B Yabsley
- School of Physics, University of Sydney, New South Wales 2006
| | - W Yan
- University of Science and Technology of China, Hefei 230026
| | | | - H Ye
- Deutsches Elektronen-Synchrotron, 22607 Hamburg
| | - M Yonenaga
- Tokyo Metropolitan University, Tokyo 192-0397
| | - C Z Yuan
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049
| | - Y Yusa
- Niigata University, Niigata 950-2181
| | - L Zani
- Aix Marseille Université, CNRS/IN2P3, CPPM, 13288 Marseille
| | - Q D Zhou
- Graduate School of Science, Nagoya University, Nagoya 464-8602
| | - V I Zhukova
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
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