Measurement of the Nuclear Modification Factor and Prompt Charged Particle Production in <i>p</i>-Pb and <i>pp</i> Collisions at √<i>s</i><sub><i>NN</i> </sub>=5 TeV



Aaij, R, Beteta, C Abellan, Ackernley, T, Adeva, B, Adinolfi, M, Afsharnia, H, Aidala, CA, Aiola, S, Ajaltouni, Z, Akar, S
et al (show 963 more authors) (2022) Measurement of the Nuclear Modification Factor and Prompt Charged Particle Production in <i>p</i>-Pb and <i>pp</i> Collisions at √<i>s</i><sub><i>NN</i> </sub>=5 TeV. PHYSICAL REVIEW LETTERS, 128 (14). 142004-.

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Abstract

The production of prompt charged particles in proton-lead collisions and in proton-proton collisions at the nucleon-nucleon center-of-mass energy sqrt[s_{NN}]=5  TeV is studied at LHCb as a function of pseudorapidity (η) 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 η between -4.8<η<-2.5 (backward region) and 2.0<η<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}.

Item Type: Article
Uncontrolled Keywords: LHCb Collaboration
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 16 May 2022 14:19
Last Modified: 07 Oct 2023 09:21
DOI: 10.1103/PhysRevLett.128.142004
Open Access URL: https://journals.aps.org/prl/abstract/10.1103/Phys...
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3154869