The production of prompt charged particles in proton-lead collisions and in proton-proton collisions at the nucleon-nucleon center-of-mass energy √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.

Measurement of the Nuclear Modification Factor and Prompt Charged Particle Production in p-Pb and pp Collisions at √sNN =5 TeV

Calabrese, R.;Capriotti, L.;Couturier, B.;Fiorini, M.;Franzoso, E.;Giugliano, C.;Guarise, M.;Kotriakhova, S.;Luppi, E.;Neri, I.;Pappalardo, L. L.;Passalacqua, B.;Tomassetti, L.;
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 √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.
2022
Aaij, R.; Abellán Beteta, C.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Afsharnia, H.; Aidala, C. A.; Aiola, S.; Ajaltouni, Z.; Akar, S.; Albrecht, J.; ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2500485
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