Nuclear Modification Factor of Neutral Pions in the Forward and Backward Regions in p-Pb Collisions
Affiliations
- 1 Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands.
- 2 Department of Physics, University of Warwick, Coventry, United Kingdom.
- 3 Physik-Institut, Universität Zürich, Zürich, Switzerland.
- 4 Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom.
- 5 Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, Spain.
- 6 H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom.
- 7 Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, France.
- 8 LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France.
- 9 University of Michigan, Ann Arbor, Michigan 48109, USA (associated with Institution Syracuse University, Syracuse, New York, USA).
- 10 INFN Sezione di Milano, Milano, Italy.
- 11 University of Cincinnati, Cincinnati, Ohio 45221, USA.
- 12 Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany.
- 13 European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 14 School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom.
- 15 ICCUB, Universitat de Barcelona, Barcelona, Spain.
- 16 Department of Physics and Astronomy, University of Manchester, Manchester, United Kingdom.
- 17 Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom.
- 18 Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil.
- 19 Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France.
- 20 INFN Sezione di Firenze, Firenze, Italy.
- 21 Affiliated with an institute covered by a cooperation agreement with CERN.
- 22 INFN Sezione di Ferrara, Ferrara, Italy.
- 23 University of Chinese Academy of Sciences, Beijing, China.
- 24 Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany.
- 25 Syracuse University, Syracuse, New York 13244, USA.
- 26 Aix Marseille University, CNRS/IN2P3, CPPM, Marseille, France.
- 27 Laboratoire Leprince-Ringuet, CNRS/IN2P3, Ecole Polytechnique, Institut Polytechnique de Paris, Palaiseau, France.
- 28 Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
- 29 Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil.
- 30 Imperial College London, London, United Kingdom.
- 31 I. Physikalisches Institut, RWTH Aachen University, Aachen, Germany.
- 32 INFN Sezione di Pisa, Pisa, Italy.
- 33 Institute of High Energy Physics (IHEP), Beijing, China.
- 34 INFN Laboratori Nazionali di Frascati, Frascati, Italy.
- 35 Università degli Studi di Padova, Università e INFN, Padova, Padova, Italy.
- 36 Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland.
- 37 School of Physics and Technology, Wuhan University, Wuhan, China (associated with Institution Center for High Energy Physics, Tsinghua University, Beijing, China).
- 38 University of Birmingham, Birmingham, United Kingdom.
- 39 Center for High Energy Physics, Tsinghua University, Beijing, China.
- 40 School of Physics State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, China.
- 41 Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China.
- 42 Université Savoie Mont Blanc, CNRS, IN2P3-LAPP, Annecy, France.
- 43 Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany.
- 44 School of Physics, University College Dublin, Dublin, Ireland.
- 45 INFN Sezione di Bari, Bari, Italy.
- 46 INFN Sezione di Bologna, Bologna, Italy.
- 47 INFN Sezione di Genova, Genova, Italy.
- 48 INFN Sezione di Milano-Bicocca, Milano, Italy.
- 49 INFN Sezione di Cagliari, Monserrato, Italy.
- 50 INFN Sezione di Roma La Sapienza, Roma, Italy.
- 51 INFN Sezione di Roma Tor Vergata, Roma, Italy.
- 52 Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, Netherlands.
- 53 AGH - University of Science and Technology, Faculty of Physics and Applied Computer Science, Kraków, Poland.
- 54 National Center for Nuclear Research (NCBJ), Warsaw, Poland.
- 55 Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania.
- 56 Instituto de Fisica Corpuscular, Centro Mixto Universidad de Valencia - CSIC, Valencia, Spain.
- 57 NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine.
- 58 Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine.
- 59 STFC Rutherford Appleton Laboratory, Didcot, United Kingdom.
- 60 School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom.
- 61 Department of Physics, University of Oxford, Oxford, United Kingdom.
- 62 Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
- 63 University of Maryland, College Park, Maryland 20742, USA.
- 64 Los Alamos National Laboratory (LANL), Los Alamos, New Mexico 87545, USA.
- 65 School of Physics and Astronomy, Monash University, Melbourne, Australia (associated with Institution Department of Physics, University of Warwick, Coventry, United Kingdom).
- 66 Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro, Brazil (associated with Institution Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil).
- 67 Physics and Micro Electronic College, Hunan University, Changsha City, China (associated with Institution Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China).
- 68 Guangdong Provincial Key Laboratory of Nuclear Science, Guangdong-Hong Kong Joint Laboratory of Quantum Matter, Institute of Quantum Matter, South China Normal University, Guangzhou, China (associated with Institution Center for High Energy Physics, Tsinghua University, Beijing, China).
- 69 Departamento de Fisica, Universidad Nacional de Colombia, Bogota, Colombia (associated with Institution LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France).
- 70 Universität Bonn - Helmholtz-Institut für Strahlen und Kernphysik, Bonn, Germany (associated with Institution Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany).
- 71 Institut für Physik, Universität Rostock, Rostock, Germany (associated with Institution Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany).
- 72 Eotvos Lorand University, Budapest, Hungary (associated with Institution European Organization for Nuclear Research (CERN), Geneva, Switzerland).
- 73 INFN Sezione di Perugia, Perugia, Italy (associated with Institution INFN Sezione di Ferrara, Ferrara, Italy).
- 74 Van Swinderen Institute, University of Groningen, Groningen, Netherlands (associated with Institution Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands).
- 75 Universiteit Maastricht, Maastricht, Netherlands (associated with Institution Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands).
- 76 DS4DS, La Salle, Universitat Ramon Llull, Barcelona, Spain (associated with Institution ICCUB, Universitat de Barcelona, Barcelona, Spain).
- 77 Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden (associated with Institution School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom).
- PMID: 37566846
- DOI: 10.1103/PhysRevLett.131.042302
Nuclear Modification Factor of Neutral Pions in the Forward and Backward Regions in p-Pb Collisions
Authors
Affiliations
- 1 Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands.
- 2 Department of Physics, University of Warwick, Coventry, United Kingdom.
- 3 Physik-Institut, Universität Zürich, Zürich, Switzerland.
- 4 Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom.
- 5 Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, Spain.
- 6 H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom.
- 7 Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, France.
- 8 LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France.
- 9 University of Michigan, Ann Arbor, Michigan 48109, USA (associated with Institution Syracuse University, Syracuse, New York, USA).
- 10 INFN Sezione di Milano, Milano, Italy.
- 11 University of Cincinnati, Cincinnati, Ohio 45221, USA.
- 12 Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany.
- 13 European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 14 School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom.
- 15 ICCUB, Universitat de Barcelona, Barcelona, Spain.
- 16 Department of Physics and Astronomy, University of Manchester, Manchester, United Kingdom.
- 17 Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom.
- 18 Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil.
- 19 Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France.
- 20 INFN Sezione di Firenze, Firenze, Italy.
- 21 Affiliated with an institute covered by a cooperation agreement with CERN.
- 22 INFN Sezione di Ferrara, Ferrara, Italy.
- 23 University of Chinese Academy of Sciences, Beijing, China.
- 24 Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany.
- 25 Syracuse University, Syracuse, New York 13244, USA.
- 26 Aix Marseille University, CNRS/IN2P3, CPPM, Marseille, France.
- 27 Laboratoire Leprince-Ringuet, CNRS/IN2P3, Ecole Polytechnique, Institut Polytechnique de Paris, Palaiseau, France.
- 28 Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
- 29 Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil.
- 30 Imperial College London, London, United Kingdom.
- 31 I. Physikalisches Institut, RWTH Aachen University, Aachen, Germany.
- 32 INFN Sezione di Pisa, Pisa, Italy.
- 33 Institute of High Energy Physics (IHEP), Beijing, China.
- 34 INFN Laboratori Nazionali di Frascati, Frascati, Italy.
- 35 Università degli Studi di Padova, Università e INFN, Padova, Padova, Italy.
- 36 Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland.
- 37 School of Physics and Technology, Wuhan University, Wuhan, China (associated with Institution Center for High Energy Physics, Tsinghua University, Beijing, China).
- 38 University of Birmingham, Birmingham, United Kingdom.
- 39 Center for High Energy Physics, Tsinghua University, Beijing, China.
- 40 School of Physics State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, China.
- 41 Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China.
- 42 Université Savoie Mont Blanc, CNRS, IN2P3-LAPP, Annecy, France.
- 43 Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany.
- 44 School of Physics, University College Dublin, Dublin, Ireland.
- 45 INFN Sezione di Bari, Bari, Italy.
- 46 INFN Sezione di Bologna, Bologna, Italy.
- 47 INFN Sezione di Genova, Genova, Italy.
- 48 INFN Sezione di Milano-Bicocca, Milano, Italy.
- 49 INFN Sezione di Cagliari, Monserrato, Italy.
- 50 INFN Sezione di Roma La Sapienza, Roma, Italy.
- 51 INFN Sezione di Roma Tor Vergata, Roma, Italy.
- 52 Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, Netherlands.
- 53 AGH - University of Science and Technology, Faculty of Physics and Applied Computer Science, Kraków, Poland.
- 54 National Center for Nuclear Research (NCBJ), Warsaw, Poland.
- 55 Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania.
- 56 Instituto de Fisica Corpuscular, Centro Mixto Universidad de Valencia - CSIC, Valencia, Spain.
- 57 NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine.
- 58 Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine.
- 59 STFC Rutherford Appleton Laboratory, Didcot, United Kingdom.
- 60 School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom.
- 61 Department of Physics, University of Oxford, Oxford, United Kingdom.
- 62 Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
- 63 University of Maryland, College Park, Maryland 20742, USA.
- 64 Los Alamos National Laboratory (LANL), Los Alamos, New Mexico 87545, USA.
- 65 School of Physics and Astronomy, Monash University, Melbourne, Australia (associated with Institution Department of Physics, University of Warwick, Coventry, United Kingdom).
- 66 Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro, Brazil (associated with Institution Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil).
- 67 Physics and Micro Electronic College, Hunan University, Changsha City, China (associated with Institution Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China).
- 68 Guangdong Provincial Key Laboratory of Nuclear Science, Guangdong-Hong Kong Joint Laboratory of Quantum Matter, Institute of Quantum Matter, South China Normal University, Guangzhou, China (associated with Institution Center for High Energy Physics, Tsinghua University, Beijing, China).
- 69 Departamento de Fisica, Universidad Nacional de Colombia, Bogota, Colombia (associated with Institution LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France).
- 70 Universität Bonn - Helmholtz-Institut für Strahlen und Kernphysik, Bonn, Germany (associated with Institution Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany).
- 71 Institut für Physik, Universität Rostock, Rostock, Germany (associated with Institution Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany).
- 72 Eotvos Lorand University, Budapest, Hungary (associated with Institution European Organization for Nuclear Research (CERN), Geneva, Switzerland).
- 73 INFN Sezione di Perugia, Perugia, Italy (associated with Institution INFN Sezione di Ferrara, Ferrara, Italy).
- 74 Van Swinderen Institute, University of Groningen, Groningen, Netherlands (associated with Institution Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands).
- 75 Universiteit Maastricht, Maastricht, Netherlands (associated with Institution Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands).
- 76 DS4DS, La Salle, Universitat Ramon Llull, Barcelona, Spain (associated with Institution ICCUB, Universitat de Barcelona, Barcelona, Spain).
- 77 Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden (associated with Institution School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom).
- PMID: 37566846
- DOI: 10.1103/PhysRevLett.131.042302
Abstract
The nuclear modification factor of neutral pions is measured in proton-lead collisions collected at a center-of-mass energy per nucleon of 8.16 TeV with the LHCb detector. The π^{0} production cross section is measured differentially in transverse momentum (p_{T}) for 1.5<p_{T}<10.0 GeV and in center-of-mass pseudorapidity (η_{c.m.}) regions 2.5<η_{c.m.}<3.5 (forward) and -4.0<η_{c.m.}<-3.0 (backward) defined relative to the proton beam direction. The forward measurement shows a sizable suppression of π^{0} production, while the backward measurement shows the first evidence of π^{0} enhancement in proton-lead collisions at the LHC. Together, these measurements provide precise constraints on models of nuclear structure and particle production in high-energy nuclear collisions.
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