2026-04-14T03:58:44Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/2213002025-12-05T17:01:43Zcom_2072_1057col_2072_478823col_2072_478904col_2072_478917

00925njm 22002777a 4500 dc Alfonso Albero, Alejandro author Garcia Moreno, Paula author Garrido Beltrán, Lluís author Gironella Gironell, Pere author Gomez Fernandez, Sergio author Graugés Pous, Eugeni author Lobo Salvia, Aniol author Marin Benito, Carla author Mauricio Ferre, Joan author Vazquez Gomez, Ricardo author LHCb Collaboration author 2025-05-30T17:52:51Z 2025-05-30T17:52:51Z 2023-07-28 2025-05-30T17:52:52Z 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. Col·lisions (Física nuclear) Física de partícules Gran Col·lisionador d'Hadrons Collisions (Nuclear physics) Particle physics Large Hadron Collider (France and Switzerland) Nuclear Modification Factor of Neutral Pions in the Forward and Backward Regions in p-Pb Collisions