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Nuclear Modification Factor of Neutral Pions in the Forward and Backward Regions in p-Pb Collisions Alfonso Albero, Alejandro Garcia Moreno, Paula Garrido Beltrán, Lluís Gironella Gironell, Pere Gomez Fernandez, Sergio Graugés Pous, Eugeni Lobo Salvia, Aniol Marin Benito, Carla Mauricio Ferre, Joan Vazquez Gomez, Ricardo LHCb Collaboration Col·lisions (Física nuclear) Física de partícules Gran Col·lisionador d'Hadrons Collisions (Nuclear physics) Particle physics Large Hadron Collider (France and Switzerland) 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 π0 production cross section is measured differentially in transverse momentum (pT) for 1.5 < pT < 10.0 GeV and in center-of-mass pseudorapidity (ηc:m:) regions 2.5 < ηc:m: < 3.5 (forward) and −4.0 < ηc:m: < −3.0 (backward) defined relative to the proton beam direction. The forward measurement shows a sizable suppression of π0 production, while the backward measurement shows the first evidence of π0 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. 2025-05-30T17:52:51Z 2025-05-30T17:52:51Z 2023-07-28 2025-05-30T17:52:52Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Reproducció del document publicat a: https://doi.org/10.1103/PhysRevLett.131.042302 Physical Review Letters, 2023, vol. 131, num.4 https://doi.org/10.1103/PhysRevLett.131.042302 (c) American Physical Society, 2023 info:eu-repo/semantics/openAccess American Physical Society Articles publicats en revistes (Física Quàntica i Astrofísica)