Nuclear Modification Factor of Neutral Pions in the Forward and Backward Regions in p−Pb Collisions

LHCb collaboration

Research output: Contribution to journalArticleAcademicpeer-review

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 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.
Original languageEnglish
Article number042302
Number of pages12
JournalPhysical review letters
Volume131
Issue number4
DOIs
Publication statusPublished - 24 Jul 2023

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