The production of prompt charged particles in proton-lead collisions and in proton-proton collisions at the nucleon-nucleon center-of-mass energy ffiffiffiffiffiffiffiffi sNN p ¼ 5 TeV is studied at LHCb as a function of pseudorapidity (η) and transverse momentum (pT ) 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 pT between 0.2 < pT < 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 pT 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.

Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2022). Measurement of the Nuclear Modification Factor and Prompt Charged Particle Production in p-Pb and pp Collisions at √sNN=TeV. PHYSICAL REVIEW LETTERS, 128(14) [10.1103/PhysRevLett.128.142004].

Measurement of the Nuclear Modification Factor and Prompt Charged Particle Production in p-Pb and pp Collisions at √sNN=TeV

Borsato, M.;Calvi, M.;Capelli, S.;Carniti, P.;Fazzini, D.;Garcia Pardinas, J.;Gotti, C.;Martinazzoli, L.;Martinelli, M.;Meloni, S.;Minotti, A.;Petruzzo, M.;Salomoni, M.;Shields, E.  B.;
2022

Abstract

The production of prompt charged particles in proton-lead collisions and in proton-proton collisions at the nucleon-nucleon center-of-mass energy ffiffiffiffiffiffiffiffi sNN p ¼ 5 TeV is studied at LHCb as a function of pseudorapidity (η) and transverse momentum (pT ) 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 pT between 0.2 < pT < 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 pT 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.
Articolo in rivista - Articolo scientifico
Fragmentation into hadrons; Relativistic heavy-ion collisions;
English
2022
128
14
142004
open
Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2022). Measurement of the Nuclear Modification Factor and Prompt Charged Particle Production in p-Pb and pp Collisions at √sNN=TeV. PHYSICAL REVIEW LETTERS, 128(14) [10.1103/PhysRevLett.128.142004].
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