Measurement of the Nuclear Modification Factor and Prompt Charged Particle Production in p-Pb and pp Collisions at root s(NN )=5 TeV

LHCb collaboration

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

The production of prompt charged particles in proton-lead collisions and in proton-proton collisions at the nucleon-nucleon center-of-mass energy root s(NN) = 5 TeV is studied at LHCb as a function of pseudorapidity (eta) and transverse momentum (p(T) ) with respect to the proton beam direction. The nuclear modification factor for charged particles is determined as a function of eta between -4.8 < eta < -2.5 (backward region) and 2.0 < eta < 4.8 (forward region), and p(T) between 0.2 < p(T) < 8.0 GeV/c. The results show a suppression of charged particle production in proton-lead collisions relative to proton-proton collisions in the forward region and an enhancement in the backward region for p(T) larger than 1.5 GeV/c. This measurement constrains nuclear PDFs and saturation models at previously unexplored values of the parton momentum fraction down to 10(-6).
Original languageEnglish
Article number142004
Number of pages12
JournalPhysical Review Letters
Volume128
Issue number14
DOIs
Publication statusPublished - 7 Apr 2022

Keywords

  • COLLECTIVITY
  • EVENT GENERATORS
  • KAON
  • LARGE TRANSVERSE-MOMENTUM
  • MULTIPLICITY DEPENDENCE
  • PION
  • PLUS

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