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Aguilar-Arevalo A, Aoki M, Blecher M, Britton D, vom Bruch D, Bryman D, Chen S, Comfort J, Cuen-Rochin S, Doria L, Gumplinger P, Hussein A, Igarashi Y, Ito S, Kettell S, Kurchaninov L, Littenberg L, Malbrunot C, Mischke R, Numao T, Protopopescu D, Sher A, Sullivan T, Vavilov D. Search for three body pion decays
π+→l+νX. Int J Clin Exp Med 2021. [DOI: 10.1103/physrevd.103.052006] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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2
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Aguilar-Arevalo A, Amidei D, Baxter D, Cancelo G, Vergara BAC, Chavarria AE, D'Olivo JC, Estrada J, Favela-Perez F, Gaïor R, Guardincerri Y, Hoppe EW, Hossbach TW, Kilminster B, Lawson I, Lee SJ, Letessier-Selvon A, Matalon A, Mitra P, Overman CT, Piers A, Privitera P, Ramanathan K, Da Rocha J, Sarkis Y, Settimo M, Smida R, Thomas R, Tiffenberg J, Traina M, Vilar R, Virto AL. Results on Low-Mass Weakly Interacting Massive Particles from an 11 kg d Target Exposure of DAMIC at SNOLAB. Phys Rev Lett 2020; 125:241803. [PMID: 33412014 DOI: 10.1103/physrevlett.125.241803] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2020] [Accepted: 11/04/2020] [Indexed: 06/12/2023]
Abstract
We present constraints on the existence of weakly interacting massive particles (WIMPs) from an 11 kg d target exposure of the DAMIC experiment at the SNOLAB underground laboratory. The observed energy spectrum and spatial distribution of ionization events with electron-equivalent energies >200 eV_{ee} in the DAMIC CCDs are consistent with backgrounds from natural radioactivity. An excess of ionization events is observed above the analysis threshold of 50 eV_{ee}. While the origin of this low-energy excess requires further investigation, our data exclude spin-independent WIMP-nucleon scattering cross sections σ_{χ-n} as low as 3×10^{-41} cm^{2} for WIMPs with masses m_{χ} from 7 to 10 GeV c^{-2}. These results are the strongest constraints from a silicon target on the existence of WIMPs with m_{χ}<9 GeV c^{-2} and are directly relevant to any dark matter interpretation of the excess of nuclear-recoil events observed by the CDMS silicon experiment in 2013.
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Affiliation(s)
| | - D Amidei
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040, USA
| | - D Baxter
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - G Cancelo
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | | | - A E Chavarria
- Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - J C D'Olivo
- Universidad Nacional Autónoma de México, Mexico City, 04510, Mexico
| | - J Estrada
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | - F Favela-Perez
- Universidad Nacional Autónoma de México, Mexico City, 04510, Mexico
| | - R Gaïor
- Laboratoire de Physique Nucléaire et des Hautes Énergies (LPNHE), Sorbonne Université, Université de Paris, CNRS-IN2P3, 75005 Paris, France
| | - Y Guardincerri
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | - E W Hoppe
- Pacific Northwest National Laboratory (PNNL), Richland, Washington 99354, USA
| | - T W Hossbach
- Pacific Northwest National Laboratory (PNNL), Richland, Washington 99354, USA
| | - B Kilminster
- Universität Zürich Physik Institut, Zurich 8057, Switzerland
| | - I Lawson
- SNOLAB, Lively, Ontario P3Y 1N2, Canada
| | - S J Lee
- Universität Zürich Physik Institut, Zurich 8057, Switzerland
| | - A Letessier-Selvon
- Laboratoire de Physique Nucléaire et des Hautes Énergies (LPNHE), Sorbonne Université, Université de Paris, CNRS-IN2P3, 75005 Paris, France
| | - A Matalon
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
- Laboratoire de Physique Nucléaire et des Hautes Énergies (LPNHE), Sorbonne Université, Université de Paris, CNRS-IN2P3, 75005 Paris, France
| | - P Mitra
- Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - C T Overman
- Pacific Northwest National Laboratory (PNNL), Richland, Washington 99354, USA
| | - A Piers
- Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - P Privitera
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
- Laboratoire de Physique Nucléaire et des Hautes Énergies (LPNHE), Sorbonne Université, Université de Paris, CNRS-IN2P3, 75005 Paris, France
| | - K Ramanathan
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - J Da Rocha
- Laboratoire de Physique Nucléaire et des Hautes Énergies (LPNHE), Sorbonne Université, Université de Paris, CNRS-IN2P3, 75005 Paris, France
| | - Y Sarkis
- Universidad Nacional Autónoma de México, Mexico City, 04510, Mexico
| | - M Settimo
- SUBATECH, CNRS-IN2P3, IMT Atlantique, Université de Nantes, Nantes 44300, France
| | - R Smida
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - R Thomas
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - J Tiffenberg
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | - M Traina
- Laboratoire de Physique Nucléaire et des Hautes Énergies (LPNHE), Sorbonne Université, Université de Paris, CNRS-IN2P3, 75005 Paris, France
| | - R Vilar
- Instituto de Física de Cantabria (IFCA), CSIC-Universidad de Cantabria, Santander 39005, Spain
| | - A L Virto
- Instituto de Física de Cantabria (IFCA), CSIC-Universidad de Cantabria, Santander 39005, Spain
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3
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Aguilar-Arevalo A, Amidei D, Baxter D, Cancelo G, Cervantes Vergara BA, Chavarria AE, Darragh-Ford E, de Mello Neto JRT, D'Olivo JC, Estrada J, Gaïor R, Guardincerri Y, Hossbach TW, Kilminster B, Lawson I, Lee SJ, Letessier-Selvon A, Matalon A, Mello VBB, Mitra P, Molina J, Paul S, Piers A, Privitera P, Ramanathan K, Da Rocha J, Sarkis Y, Settimo M, Smida R, Thomas R, Tiffenberg J, Torres Machado D, Vilar R, Virto AL. Constraints on Light Dark Matter Particles Interacting with Electrons from DAMIC at SNOLAB. Phys Rev Lett 2019; 123:181802. [PMID: 31763884 DOI: 10.1103/physrevlett.123.181802] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2019] [Revised: 10/03/2019] [Indexed: 06/10/2023]
Abstract
We report direct-detection constraints on light dark matter particles interacting with electrons. The results are based on a method that exploits the extremely low levels of leakage current of the DAMIC detector at SNOLAB of 2-6×10^{-22} A cm^{-2}. We evaluate the charge distribution of pixels that collect <10e^{-} for contributions beyond the leakage current that may be attributed to dark matter interactions. Constraints are placed on so-far unexplored parameter space for dark matter masses between 0.6 and 100 MeV c^{-2}. We also present new constraints on hidden-photon dark matter with masses in the range 1.2-30 eV c^{-2}.
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Affiliation(s)
| | - D Amidei
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040, USA
| | - D Baxter
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - G Cancelo
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | | | - A E Chavarria
- Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - E Darragh-Ford
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - J R T de Mello Neto
- Universidade Federal do Rio de Janeiro, Instituto de Física, Rio de Janeiro 21.941-611, Brazil
| | - J C D'Olivo
- Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
| | - J Estrada
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | - R Gaïor
- Laboratoire de Physique Nucléaire et des Hautes Énergies (LPNHE), Sorbonne Université, Université de Paris, CNRS-IN2P3 75005, Paris France
| | - Y Guardincerri
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | - T W Hossbach
- Pacific Northwest National Laboratory (PNNL), Richland, Washington 99354, USA
| | - B Kilminster
- Universität Zürich Physik Institut, Zurich 8057, Switzerland
| | - I Lawson
- SNOLAB, Lively, Ontario P3Y 1N2, Canada
| | - S J Lee
- Universität Zürich Physik Institut, Zurich 8057, Switzerland
| | - A Letessier-Selvon
- Laboratoire de Physique Nucléaire et des Hautes Énergies (LPNHE), Sorbonne Université, Université de Paris, CNRS-IN2P3 75005, Paris France
| | - A Matalon
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
- Laboratoire de Physique Nucléaire et des Hautes Énergies (LPNHE), Sorbonne Université, Université de Paris, CNRS-IN2P3 75005, Paris France
| | - V B B Mello
- Universidade Federal do Rio de Janeiro, Instituto de Física, Rio de Janeiro 21.941-611, Brazil
| | - P Mitra
- Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - J Molina
- Facultad de Ingeniería, Universidad Nacional de Asunción, Asuncion 2169, Paraguay
| | - S Paul
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - A Piers
- Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - P Privitera
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
- Laboratoire de Physique Nucléaire et des Hautes Énergies (LPNHE), Sorbonne Université, Université de Paris, CNRS-IN2P3 75005, Paris France
| | - K Ramanathan
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - J Da Rocha
- Laboratoire de Physique Nucléaire et des Hautes Énergies (LPNHE), Sorbonne Université, Université de Paris, CNRS-IN2P3 75005, Paris France
| | - Y Sarkis
- Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
| | - M Settimo
- SUBATECH, CNRS-IN2P3, IMT Atlantique, Université de Nantes, Nantes 44300, France
| | - R Smida
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - R Thomas
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - J Tiffenberg
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | - D Torres Machado
- Universidade Federal do Rio de Janeiro, Instituto de Física, Rio de Janeiro 21.941-611, Brazil
| | - R Vilar
- Instituto de Física de Cantabria (IFCA), CSIC-Universidad de Cantabria, Santander 39005, Spain
| | - A L Virto
- Instituto de Física de Cantabria (IFCA), CSIC-Universidad de Cantabria, Santander 39005, Spain
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4
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Aguilar-Arevalo A, Aoki M, Blecher M, Britton D, vom Bruch D, Bryman D, Chen S, Comfort J, Cuen-Rochin S, Doria L, Gumplinger P, Hussein A, Igarashi Y, Ito S, Kettell S, Kurchaninov L, Littenberg L, Malbrunot C, Mischke R, Numao T, Protopopescu D, Sher A, Sullivan T, Vavilov D. Improved search for heavy neutrinos in the decay
π→eν. Int J Clin Exp Med 2018. [DOI: 10.1103/physrevd.97.072012] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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5
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Aguilar-Arevalo A, Amidei D, Bertou X, Butner M, Cancelo G, Castañeda Vázquez A, Cervantes Vergara BA, Chavarria AE, Chavez CR, de Mello Neto JRT, D'Olivo JC, Estrada J, Fernandez Moroni G, Gaïor R, Guardincerri Y, Hernández Torres KP, Izraelevitch F, Kavner A, Kilminster B, Lawson I, Letessier-Selvon A, Liao J, Matalon A, Mello VBB, Molina J, Privitera P, Ramanathan K, Sarkis Y, Schwarz T, Settimo M, Sofo Haro M, Thomas R, Tiffenberg J, Tiouchichine E, Torres Machado D, Trillaud F, You X, Zhou J. First Direct-Detection Constraints on eV-Scale Hidden-Photon Dark Matter with DAMIC at SNOLAB. Phys Rev Lett 2017; 118:141803. [PMID: 28430473 DOI: 10.1103/physrevlett.118.141803] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2016] [Indexed: 06/07/2023]
Abstract
We present direct detection constraints on the absorption of hidden-photon dark matter with particle masses in the range 1.2-30 eV c^{-2} with the DAMIC experiment at SNOLAB. Under the assumption that the local dark matter is entirely constituted of hidden photons, the sensitivity to the kinetic mixing parameter κ is competitive with constraints from solar emission, reaching a minimum value of 2.2×10^{-14} at 17 eV c^{-2}. These results are the most stringent direct detection constraints on hidden-photon dark matter in the galactic halo with masses 3-12 eV c^{-2} and the first demonstration of direct experimental sensitivity to ionization signals <12 eV from dark matter interactions.
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Affiliation(s)
| | - D Amidei
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040, USA
| | - X Bertou
- Centro Atómico Bariloche, CNEA/CONICET/IB, Bariloche 8400, Argentina
| | - M Butner
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
- Northern Illinois University, DeKalb, Illinois 60115, USA
| | - G Cancelo
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | | | | | - A E Chavarria
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - C R Chavez
- Facultad de Ingeniería, Universidad Nacional de Asunción, Asuncion 2169, Paraguay
| | - J R T de Mello Neto
- Universidade Federal do Rio de Janeiro, Instituto de Física, Rio de Janeiro 21.941-611, Brazil
| | - J C D'Olivo
- Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
| | - J Estrada
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | - G Fernandez Moroni
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
- Universidad Nacional del Sur, Bahia Blanca 8000, Argentina
| | - R Gaïor
- Laboratoire de Physique Nucléaire et de Hautes Energies (LPNHE), Universités Paris 6 et Paris 7, CNRS-IN2P3, F-75005 Paris, France
| | - Y Guardincerri
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | | | - F Izraelevitch
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | - A Kavner
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040, USA
| | - B Kilminster
- Universität Zürich Physik Institut, Zurich 8057, Switzerland
| | - I Lawson
- SNOLAB, Lively, Ontario P3Y 1N2, Canada
| | - A Letessier-Selvon
- Laboratoire de Physique Nucléaire et de Hautes Energies (LPNHE), Universités Paris 6 et Paris 7, CNRS-IN2P3, F-75005 Paris, France
| | - J Liao
- Universität Zürich Physik Institut, Zurich 8057, Switzerland
| | - A Matalon
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - V B B Mello
- Universidade Federal do Rio de Janeiro, Instituto de Física, Rio de Janeiro 21.941-611, Brazil
| | - J Molina
- Facultad de Ingeniería, Universidad Nacional de Asunción, Asuncion 2169, Paraguay
| | - P Privitera
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - K Ramanathan
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - Y Sarkis
- Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
| | - T Schwarz
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040, USA
| | - M Settimo
- Laboratoire de Physique Nucléaire et de Hautes Energies (LPNHE), Universités Paris 6 et Paris 7, CNRS-IN2P3, F-75005 Paris, France
| | - M Sofo Haro
- Centro Atómico Bariloche, CNEA/CONICET/IB, Bariloche 8400, Argentina
| | - R Thomas
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
| | - J Tiffenberg
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | - E Tiouchichine
- Centro Atómico Bariloche, CNEA/CONICET/IB, Bariloche 8400, Argentina
| | - D Torres Machado
- Universidade Federal do Rio de Janeiro, Instituto de Física, Rio de Janeiro 21.941-611, Brazil
| | - F Trillaud
- Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
| | - X You
- Universidade Federal do Rio de Janeiro, Instituto de Física, Rio de Janeiro 21.941-611, Brazil
| | - J Zhou
- Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
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6
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Aguilar-Arevalo A, Aoki M, Blecher M, Britton DI, Bryman DA, Vom Bruch D, Chen S, Comfort J, Ding M, Doria L, Cuen-Rochin S, Gumplinger P, Hussein A, Igarashi Y, Ito S, Kettell SH, Kurchaninov L, Littenberg LS, Malbrunot C, Mischke RE, Numao T, Protopopescu D, Sher A, Sullivan T, Vavilov D, Yamada K. Improved Measurement of the π→eν Branching Ratio. Phys Rev Lett 2015; 115:071801. [PMID: 26317713 DOI: 10.1103/physrevlett.115.071801] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2015] [Indexed: 06/04/2023]
Abstract
A new measurement of the branching ratio R_{e/μ}=Γ(π^{+}→e^{+}ν+π^{+}→e^{+}νγ)/Γ(π^{+}→μ^{+}ν+π^{+}→μ^{+}νγ) resulted in R_{e/μ}^{exp}=[1.2344±0.0023(stat)±0.0019(syst)]×10^{-4}. This is in agreement with the standard model prediction and improves the test of electron-muon universality to the level of 0.1%.
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Affiliation(s)
- A Aguilar-Arevalo
- Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de Mexico, Distrito Federal 04510 México
| | - M Aoki
- Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - M Blecher
- Physics Department, Virginia Tech, Blacksburg, Virginia 24061, USA
| | - D I Britton
- Physics Department, University of Glasgow, Glasgow G12 8QQ, United Kingdom
| | - D A Bryman
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - D Vom Bruch
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - S Chen
- Department of Engineering Physics, Tsinghua University, Beijing 100084, People's Republic of China
| | - J Comfort
- Physics Department, Arizona State University, Tempe, Arizona 85287, USA
| | - M Ding
- Department of Engineering Physics, Tsinghua University, Beijing 100084, People's Republic of China
| | - L Doria
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - S Cuen-Rochin
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - P Gumplinger
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - A Hussein
- University of Northern British Columbia, Prince George, British Columbia V2N 4Z9, Canada
| | - Y Igarashi
- KEK, 1-1 Oho, Tsukuba-shi, Ibaraki 305-0801, Japan
| | - S Ito
- Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - S H Kettell
- Brookhaven National Laboratory, Upton, New York 11973-5000, USA
| | - L Kurchaninov
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - L S Littenberg
- Brookhaven National Laboratory, Upton, New York 11973-5000, USA
| | - C Malbrunot
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - R E Mischke
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - T Numao
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - D Protopopescu
- Physics Department, University of Glasgow, Glasgow G12 8QQ, United Kingdom
| | - A Sher
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - T Sullivan
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - D Vavilov
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - K Yamada
- Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
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