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Segarra E, Ježo T, Accardi A, Duwentäster P, Hen O, Hobbs T, Keppel C, Klasen M, Kovařík K, Kusina A, Morfín J, Muzakka K, Olness F, Schienbein I, Yu. J. Extending nuclear PDF analyses into the high-
x
, low-
Q2
region. Int J Clin Exp Med 2021. [DOI: 10.1103/physrevd.103.114015] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [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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Kusina A, Lansberg JP, Schienbein I, Shao HS. Gluon Shadowing in Heavy-Flavor Production at the LHC. Phys Rev Lett 2018; 121:052004. [PMID: 30118312 DOI: 10.1103/physrevlett.121.052004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Revised: 04/26/2018] [Indexed: 06/08/2023]
Abstract
We study the relevance of experimental data on heavy-flavor [D^{0}, J/ψ, B→J/ψ and ϒ(1S) mesons] production in proton-lead collisions at the LHC to improve our knowledge of the gluon-momentum distribution inside heavy nuclei. We observe that the nuclear effects encoded in both most recent global fits of nuclear parton densities at next-to-leading order (nCTEQ15 and EPPS16) provide a good overall description of the LHC data. We interpret this as a hint that these are the dominant ones. In turn, we perform a Bayesian-reweighting analysis for each particle data sample which shows that each of the existing heavy-quark(onium) data set clearly points-with a minimal statistical significance of 7σ-to a shadowed gluon distribution at small x in the lead. Moreover, our analysis corroborates the existence of gluon antishadowing. Overall, the inclusion of such heavy-flavor data in a global fit would significantly reduce the uncertainty on the gluon density down to x≃7×10^{-6}-where no other data exist-while keeping an agreement with the other data of the global fits. Our study accounts for the factorization-scale uncertainties which dominate for the charm(onium) sector.
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Affiliation(s)
- Aleksander Kusina
- Institute of Nuclear Physics, Polish Academy of Sciences, ul. Radzikowskiego 152, 31-342 Cracow, Poland
| | | | - Ingo Schienbein
- Laboratoire de Physique Subatomique et de Cosmologie, Université Grenoble-Alpes, CNRS/IN2P3, 53 avenue des Martyrs, 38026 Grenoble, France
| | - Hua-Sheng Shao
- Sorbonne Universités, UPMC Univ. Paris 06, UMR 7589, LPTHE, F-75005, Paris, France
- CNRS, UMR 7589, LPTHE, F-75005, Paris, France
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Massacrier L, Anselmino M, Arnaldi R, Brodsky S, Chambert V, Da Silva C, Didelez J, Echevarria M, Ferreiro E, Fleuret F, Gao Y, Genolini B, Hadjidakis C, Hřivnáčová I, Kikola D, Klein A, Kurepin A, Kusina A, Lansberg J, Lorcé C, Lyonnet F, Martinez G, Nass A, Pisano C, Robbe P, Schienbein I, Schlegel M, Scomparin E, Seixas J, Shao H, Signori A, Steffens E, Szymanowski L, Topilskaya N, Trzeciak B, Uggerhøj U, Uras A, Ulrich R, Wagner J, Yamanaka N, Yang Z. Physics perspectives with AFTER@LHC (A Fixed Target ExpeRiment at LHC). EPJ Web Conf 2018. [DOI: 10.1051/epjconf/201817110001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
AFTER@LHC is an ambitious fixed-target project in order to address open questions in the domain of proton and neutron spins, Quark Gluon Plasma and high-x physics, at the highest energy ever reached in the fixed-target mode. Indeed, thanks to the highly energetic 7 TeV proton and 2.76 A.TeV lead LHC beams, center-of-mass energies as large as [see formula in PDF] = 115 GeV in pp/pA and [see formula in PDF] = 72 GeV in AA can be reached, corresponding to an uncharted energy domain between SPS and RHIC. We report two main ways of performing fixed-target collisions at the LHC, both allowing for the usage of one of the existing LHC experiments. In these proceedings, after discussing the projected luminosities considered for one year of data taking at the LHC, we will present a selection of projections for light and heavy-flavour production.
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5
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Bertone V, Britzger D, Camarda S, Cooper-Sarkar A, Geiser A, Giuli F, Glazov A, Godat E, Kusina A, Luszczak A, Lyonnet F, Olness F, Plačakytė R, Radescu V, Schienbein I, Zenaiev O. Impact of the heavy-quark matching scales in PDF fits. Eur Phys J C Part Fields 2017; 77:837. [PMID: 31997936 PMCID: PMC6956874 DOI: 10.1140/epjc/s10052-017-5407-3] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2017] [Accepted: 11/22/2017] [Indexed: 06/09/2023]
Abstract
We investigate the impact of displaced heavy-quark matching scales in a global fit. The heavy-quark matching scale μ m determines at which energy scale μ the QCD theory transitions from N F toN F + 1 in the variable flavor number scheme (VFNS) for the evolution of the parton distribution functions (PDFs) and strong couplingα S ( μ ) . We study the variation of the matching scales, and their impact on a global PDF fit of the combined HERA data. As the choice of the matching scale μ m effectively is a choice of scheme, this represents a theoretical uncertainty; ideally, we would like to see minimal dependence on this parameter. For the transition across the charm quark (fromN F = 3 to 4), we find a largeμ m = μ c dependence of the global fit χ 2 at NLO, but this is significantly reduced at NNLO. For the transition across the bottom quark (fromN F = 4 to 5), we have a reducedμ m = μ b dependence of the χ 2 at both NLO and NNLO as compared to the charm. This feature is now implemented in xFitter 2.0.0, an open source QCD fit framework.
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Affiliation(s)
- The xFitter Developers’ Team:
- Department of Physics and Astronomy, VU University, 1081 HV Amsterdam, The Netherlands
- Nikhef Theory Group Science Park 105, 1098 XG Amsterdam, The Netherlands
- DESY Hamburg, Notkestraße 85, 22609 Hamburg, Germany
- CERN, 1211 Geneva 23, Switzerland
- University of Oxford, 1 Keble Road, Oxford, OX1 3NP UK
- SMU Physics, Box 0175, Dallas, TX 75275-0175 USA
- Laboratoire de Physique Subatomique et de Cosmologie, Université Grenoble Alpes, CNRS/IN2P3, 53 avenue des Martyrs, 38026 Grenoble, France
- Institute of Nuclear Physics, Polish Academy of Sciences, ul. Radzikowskiego 152, 31-342 Kraków, Poland
- T.Kosciuszko Cracow University of Technology, 30-084 Kraków, Poland
- Institut für Theoretische Physik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - V. Bertone
- Department of Physics and Astronomy, VU University, 1081 HV Amsterdam, The Netherlands
- Nikhef Theory Group Science Park 105, 1098 XG Amsterdam, The Netherlands
| | - D. Britzger
- DESY Hamburg, Notkestraße 85, 22609 Hamburg, Germany
| | | | | | - A. Geiser
- DESY Hamburg, Notkestraße 85, 22609 Hamburg, Germany
| | - F. Giuli
- University of Oxford, 1 Keble Road, Oxford, OX1 3NP UK
| | - A. Glazov
- DESY Hamburg, Notkestraße 85, 22609 Hamburg, Germany
| | - E. Godat
- SMU Physics, Box 0175, Dallas, TX 75275-0175 USA
| | - A. Kusina
- Laboratoire de Physique Subatomique et de Cosmologie, Université Grenoble Alpes, CNRS/IN2P3, 53 avenue des Martyrs, 38026 Grenoble, France
- Institute of Nuclear Physics, Polish Academy of Sciences, ul. Radzikowskiego 152, 31-342 Kraków, Poland
| | - A. Luszczak
- T.Kosciuszko Cracow University of Technology, 30-084 Kraków, Poland
| | - F. Lyonnet
- SMU Physics, Box 0175, Dallas, TX 75275-0175 USA
| | - F. Olness
- SMU Physics, Box 0175, Dallas, TX 75275-0175 USA
| | - R. Plačakytė
- Institut für Theoretische Physik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - V. Radescu
- DESY Hamburg, Notkestraße 85, 22609 Hamburg, Germany
- CERN, 1211 Geneva 23, Switzerland
| | - I. Schienbein
- Laboratoire de Physique Subatomique et de Cosmologie, Université Grenoble Alpes, CNRS/IN2P3, 53 avenue des Martyrs, 38026 Grenoble, France
| | - O. Zenaiev
- DESY Hamburg, Notkestraße 85, 22609 Hamburg, Germany
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6
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Alekhin S, Altmannshofer W, Asaka T, Batell B, Bezrukov F, Bondarenko K, Boyarsky A, Choi KY, Corral C, Craig N, Curtin D, Davidson S, de Gouvêa A, Dell'Oro S, deNiverville P, Bhupal Dev PS, Dreiner H, Drewes M, Eijima S, Essig R, Fradette A, Garbrecht B, Gavela B, Giudice GF, Goodsell MD, Gorbunov D, Gori S, Grojean C, Guffanti A, Hambye T, Hansen SH, Helo JC, Hernandez P, Ibarra A, Ivashko A, Izaguirre E, Jaeckel J, Jeong YS, Kahlhoefer F, Kahn Y, Katz A, Kim CS, Kovalenko S, Krnjaic G, Lyubovitskij VE, Marcocci S, Mccullough M, McKeen D, Mitselmakher G, Moch SO, Mohapatra RN, Morrissey DE, Ovchynnikov M, Paschos E, Pilaftsis A, Pospelov M, Reno MH, Ringwald A, Ritz A, Roszkowski L, Rubakov V, Ruchayskiy O, Schienbein I, Schmeier D, Schmidt-Hoberg K, Schwaller P, Senjanovic G, Seto O, Shaposhnikov M, Shchutska L, Shelton J, Shrock R, Shuve B, Spannowsky M, Spray A, Staub F, Stolarski D, Strassler M, Tello V, Tramontano F, Tripathi A, Tulin S, Vissani F, Winkler MW, Zurek KM. A facility to search for hidden particles at the CERN SPS: the SHiP physics case. Rep Prog Phys 2016; 79:124201. [PMID: 27775925 DOI: 10.1088/0034-4885/79/12/124201] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
This paper describes the physics case for a new fixed target facility at CERN SPS. The SHiP (search for hidden particles) experiment is intended to hunt for new physics in the largely unexplored domain of very weakly interacting particles with masses below the Fermi scale, inaccessible to the LHC experiments, and to study tau neutrino physics. The same proton beam setup can be used later to look for decays of tau-leptons with lepton flavour number non-conservation, [Formula: see text] and to search for weakly-interacting sub-GeV dark matter candidates. We discuss the evidence for physics beyond the standard model and describe interactions between new particles and four different portals-scalars, vectors, fermions or axion-like particles. We discuss motivations for different models, manifesting themselves via these interactions, and how they can be probed with the SHiP experiment and present several case studies. The prospects to search for relatively light SUSY and composite particles at SHiP are also discussed. We demonstrate that the SHiP experiment has a unique potential to discover new physics and can directly probe a number of solutions of beyond the standard model puzzles, such as neutrino masses, baryon asymmetry of the Universe, dark matter, and inflation.
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Affiliation(s)
- Sergey Alekhin
- Deutsches Elektronensynchrotron DESY, Platanenallee 6, D-15738 Zeuthen, Germany. Institute for High Energy Physics, 142281 Protvino, Moscow region, Russia
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7
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Andronic A, Arleo F, Arnaldi R, Beraudo A, Bruna E, Caffarri D, del Valle ZC, Contreras JG, Dahms T, Dainese A, Djordjevic M, Ferreiro EG, Fujii H, Gossiaux PB, de Cassagnac RG, Hadjidakis C, He M, van Hees H, Horowitz WA, Kolevatov R, Kopeliovich BZ, Lansberg JP, Lombardo MP, Lourenço C, Martinez-Garcia G, Massacrier L, Mironov C, Mischke A, Nahrgang M, Nguyen M, Nystrand J, Peigné S, Porteboeuf-Houssais S, Potashnikova IK, Rakotozafindrabe A, Rapp R, Robbe P, Rosati M, Rosnet P, Satz H, Schicker R, Schienbein I, Schmidt I, Scomparin E, Sharma R, Stachel J, Stocco D, Strickland M, Tieulent R, Trzeciak BA, Uphoff J, Vitev I, Vogt R, Watanabe K, Woehri H, Zhuang P. Heavy-flavour and quarkonium production in the LHC era: from proton-proton to heavy-ion collisions. Eur Phys J C Part Fields 2016; 76:107. [PMID: 27471429 PMCID: PMC4946869 DOI: 10.1140/epjc/s10052-015-3819-5] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/15/2015] [Accepted: 12/01/2015] [Indexed: 06/06/2023]
Abstract
This report reviews the study of open heavy-flavour and quarkonium production in high-energy hadronic collisions, as tools to investigate fundamental aspects of Quantum Chromodynamics, from the proton and nucleus structure at high energy to deconfinement and the properties of the Quark-Gluon Plasma. Emphasis is given to the lessons learnt from LHC Run 1 results, which are reviewed in a global picture with the results from SPS and RHIC at lower energies, as well as to the questions to be addressed in the future. The report covers heavy flavour and quarkonium production in proton-proton, proton-nucleus and nucleus-nucleus collisions. This includes discussion of the effects of hot and cold strongly interacting matter, quarkonium photoproduction in nucleus-nucleus collisions and perspectives on the study of heavy flavour and quarkonium with upgrades of existing experiments and new experiments. The report results from the activity of the SaporeGravis network of the I3 Hadron Physics programme of the European Union 7[Formula: see text] Framework Programme.
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Affiliation(s)
- A. Andronic
- />Research Division, ExtreMe Matter Institute (EMMI), GSI Helmholzzentrum für Schwerionenforschung, Darmstadt, Germany
| | - F. Arleo
- />Laboratoire Leprince-Ringuet, Ecole Polytechnique, CNRS/IN2P3, Université Paris–Saclay, Palaiseau, France
- />Laboratoire d’Annecy-le-Vieux de Physique Théorique (LAPTh), Université de Savoie, CNRS, Annecy-le-Vieux, France
| | | | | | - E. Bruna
- />Sezione di Torino, INFN, Turin, Italy
| | - D. Caffarri
- />European Organization for Nuclear Research (CERN), Geneva, Switzerland
| | - Z. Conesa del Valle
- />IPNO, Univ. Paris-Sud, CNRS/IN2P3, Université Paris–Saclay, 91406 Orsay Cedex, France
| | - J. G. Contreras
- />Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Prague, Czech Republic
| | - T. Dahms
- />Excellence Cluster Universe, Technische Universität München, Munich, Germany
| | | | - M. Djordjevic
- />Institute of Physics Belgrade, University of Belgrade, Belgrade, Serbia
| | - E. G. Ferreiro
- />Departamento de Física de Partículas, IGFAE, Universidad de Santiago de Compostela, Santiago de Compostela, Spain
| | - H. Fujii
- />Institute of Physics, University of Tokyo, Tokyo, Japan
| | - P.-B. Gossiaux
- />SUBATECH, Ecole des Mines de Nantes, Université de Nantes, CNRS-IN2P3, Nantes, France
| | - R. Granier de Cassagnac
- />Laboratoire Leprince-Ringuet, Ecole Polytechnique, CNRS/IN2P3, Université Paris–Saclay, Palaiseau, France
| | - C. Hadjidakis
- />IPNO, Univ. Paris-Sud, CNRS/IN2P3, Université Paris–Saclay, 91406 Orsay Cedex, France
| | - M. He
- />Department of Applied Physics, Nanjing University of Science and Technology, Nanjing, China
| | - H. van Hees
- />FIAS, Institute for Theoretical Physics, Frankfurt, Germany
| | - W. A. Horowitz
- />Department of Physics, University of Cape Town, Cape Town, South Africa
| | - R. Kolevatov
- />SUBATECH, Ecole des Mines de Nantes, Université de Nantes, CNRS-IN2P3, Nantes, France
- />Department of High Energy Physics, Saint-Petersburg State University, Ulyanovskaya 1, Saint Petersburg, Russia
| | - B. Z. Kopeliovich
- />Departamento de Física, Centro Científico-Tecnológico de Valparaíso, Universidad Técnica Federico Santa María, Valparaiso, Chile
| | - J.-P. Lansberg
- />IPNO, Univ. Paris-Sud, CNRS/IN2P3, Université Paris–Saclay, 91406 Orsay Cedex, France
| | - M. P. Lombardo
- />INFN, Laboratori Nazionali di Frascati, Frascati, Italy
| | - C. Lourenço
- />European Organization for Nuclear Research (CERN), Geneva, Switzerland
| | - G. Martinez-Garcia
- />SUBATECH, Ecole des Mines de Nantes, Université de Nantes, CNRS-IN2P3, Nantes, France
| | - L. Massacrier
- />IPNO, Univ. Paris-Sud, CNRS/IN2P3, Université Paris–Saclay, 91406 Orsay Cedex, France
- />SUBATECH, Ecole des Mines de Nantes, Université de Nantes, CNRS-IN2P3, Nantes, France
- />LAL, Univ. Paris-Sud, CNRS/IN2P3, Université Paris–Saclay, Orsay, France
| | - C. Mironov
- />Laboratoire Leprince-Ringuet, Ecole Polytechnique, CNRS/IN2P3, Université Paris–Saclay, Palaiseau, France
| | - A. Mischke
- /> Faculty of Science, Institute for Subatomic Physics, Utrecht University, Utrecht, The Netherlands
- />National Institute for Subatomic Physics, Amsterdam, The Netherlands
| | - M. Nahrgang
- />Department of Physics, Duke University, Durham, USA
| | - M. Nguyen
- />Laboratoire Leprince-Ringuet, Ecole Polytechnique, CNRS/IN2P3, Université Paris–Saclay, Palaiseau, France
| | - J. Nystrand
- />Department of Physics and Technology, University of Bergen, Bergen, Norway
| | - S. Peigné
- />SUBATECH, Ecole des Mines de Nantes, Université de Nantes, CNRS-IN2P3, Nantes, France
| | - S. Porteboeuf-Houssais
- />Laboratoire de Physique Corpusculaire (LPC), Université Clermont Auvergne, Université Blaise Pascal, CNRS/IN2P3, Clermont-Ferrand, France
| | - I. K. Potashnikova
- />Departamento de Física, Centro Científico-Tecnológico de Valparaíso, Universidad Técnica Federico Santa María, Valparaiso, Chile
| | | | - R. Rapp
- />Department of Physics and Astronomy, Cyclotron Institute, Texas A&M University, College Station, USA
| | - P. Robbe
- />LAL, Univ. Paris-Sud, CNRS/IN2P3, Université Paris–Saclay, Orsay, France
| | | | - P. Rosnet
- />Laboratoire de Physique Corpusculaire (LPC), Université Clermont Auvergne, Université Blaise Pascal, CNRS/IN2P3, Clermont-Ferrand, France
| | - H. Satz
- />Fakultät für Physik, Universität Bielefeld, Bielefeld, Germany
| | - R. Schicker
- />Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
| | - I. Schienbein
- />Laboratoire de Physique Subatomique et de Cosmologie, Université Grenoble-Alpes, CNRS/IN2P3, Grenoble, France
| | - I. Schmidt
- />Departamento de Física, Centro Científico-Tecnológico de Valparaíso, Universidad Técnica Federico Santa María, Valparaiso, Chile
| | | | - R. Sharma
- />Department of Theoretical Physics, Tata Institute of Fundamental Research, Mumbai, India
| | - J. Stachel
- />Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
| | - D. Stocco
- />SUBATECH, Ecole des Mines de Nantes, Université de Nantes, CNRS-IN2P3, Nantes, France
| | - M. Strickland
- />Department of Physics, Kent State University, Kent, USA
| | - R. Tieulent
- />IPN-Lyon, Université de Lyon, Université Lyon 1, CNRS/IN2P3, Villeurbanne, France
| | - B. A. Trzeciak
- />Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Prague, Czech Republic
| | - J. Uphoff
- />Institut für Theoretische Physik, Johann Wolfgang Goethe-Universität, Frankfurt am Main, Germany
| | - I. Vitev
- />Theoretical Division, Los Alamos National Laboratory, Los Alamos, USA
| | - R. Vogt
- />Physics Division, Lawrence Livermore National Laboratory, Livermore, USA
- />Physics Department, University of California, Davis, USA
| | - K. Watanabe
- />Institute of Physics, University of Tokyo, Tokyo, Japan
- />Key Laboratory of Quark and Lepton Physics (MOE), Institute of Particle Physics, Central China Normal University, Wuhan, China
| | - H. Woehri
- />European Organization for Nuclear Research (CERN), Geneva, Switzerland
| | - P. Zhuang
- />Physics Department, Collaborative Innovation Center of Quantum Matter, Tsinghua University, Beijing, China
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Kusina A, Lyonnet F, Olness FI, Schienbein I. Frontiers of QCD with Precision nPDFs. EPJ Web of Conferences 2016. [DOI: 10.1051/epjconf/201611203006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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9
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Lansberg J, Anselmino M, Arnaldi R, Brodsky S, Chambert V, den Dunnen W, Didelez J, Genolini B, Ferreiro E, Fleuret F, Gao Y, Hadjidakis C, Hrvinacova I, Lorcé C, Massacrier L, Mikkelsen R, Pisano C, Rakotozafindrabe A, Rosier P, Schienbein I, Schlegel M, Scomparin E, Trzeciak B, Uggerhøj U, Ulrich R, Yang Z. Spin physics and TMD studies at A Fixed-Target ExpeRiment at the LHC (AFTER@LHC). EPJ Web of Conferences 2015. [DOI: 10.1051/epjconf/20158502038] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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10
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Lansberg J, Arnaldi R, Brodsky S, Chambert V, Didelez J, Genolini B, Ferreiro E, Fleuret F, Hadjidakis C, Lorcé C, Rakotozafindrabe A, Rosier P, Schienbein I, Scomparin E, Uggerhøj U. AFTER@LHC: a precision machine to study the interface between particle and nuclear physics. EPJ Web of Conferences 2014. [DOI: 10.1051/epjconf/20146611023] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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11
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Kusina A, Olness FI, Schienbein I, Ježo T, Kovařík K, Stavreva T, Yu JY. Hybrid scheme for heavy flavors: Merging the fixed flavor number scheme and variable flavor number scheme. Int J Clin Exp Med 2013. [DOI: 10.1103/physrevd.88.074032] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [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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Kovařík K, Schienbein I, Olness FI, Yu JY, Keppel C, Morfín JG, Owens JF, Stavreva T. Nuclear corrections in neutrino-nucleus deep inelastic scattering and their compatibility with global nuclear parton-distribution-function analyses. Phys Rev Lett 2011; 106:122301. [PMID: 21517308 DOI: 10.1103/physrevlett.106.122301] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2010] [Indexed: 05/30/2023]
Abstract
We perform a global χ² analysis of nuclear parton distribution functions using data from charged current neutrino-nucleus (νA) deep-inelastic scattering (DIS), charged-lepton-nucleus (ℓ(±)A) DIS, and the Drell-Yan (DY) process. We show that the nuclear corrections in νA DIS are not compatible with the predictions derived from ℓ(±)A DIS and DY data. We quantify this result using a hypothesis-testing criterion based on the χ² distribution which we apply to the total χ² as well as to the χ² of the individual data sets. We find that it is not possible to accommodate the data from νA and ℓ(±)A DIS by an acceptable combined fit. Our result has strong implications for the extraction of both nuclear and proton parton distribution functions using combined neutrino and charged-lepton data sets.
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Affiliation(s)
- K Kovařík
- LPSC, Université Joseph Fourier/CNRS-IN2P3/INPG, UMR5821, Grenoble, F-38026, France
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15
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Kniehl BA, Kramer G, Schienbein I, Spiesberger H. Reconciling open-charm production at the Fermilab Tevatron with QCD. Phys Rev Lett 2006; 96:012001. [PMID: 16486440 DOI: 10.1103/physrevlett.96.012001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2005] [Indexed: 05/06/2023]
Abstract
We study the inclusive hadroproduction of D0, D+, D*+, and D(s)+ mesons at next-to-leading order in the parton model of quantum chromodynamics endowed with universal nonperturbative fragmentation functions fitted to e+e- annihilation data from CERN LEP1. Working in the general-mass variable-flavor-number scheme, we resum the large logarithms through the evolution of the fragmentation functions and, at the same time, retain the full dependence on the charm-quark mass without additional theoretical assumptions. In this way, the cross section distributions in transverse momentum recently measured by the CDF Collaboration in run II at the Fermilab Tevatron are described within errors.
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Affiliation(s)
- B A Kniehl
- II. Institut für Theoretische Physik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
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