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Nuclear effects on the transverse momentum spectra of charged particles in pPb Collisions at $\sqrt{s_{NN}}$ = 5.02 TeV


CMS Collaboration; Khachatryan, V; Sirunyan, A M; Tumasyan, A; Amsler, C; Canelli, F; Chiochia, V; De Cosa, A; Hinzmann, A; Hreus, T; Kilminster, B; Lange, C; Mejias, B M; Ngadiuba, J; Pinna, D; Ronga, F J; Robmann, P; Taroni, S; Verzetti, M; Yang, Y; et al (2015). Nuclear effects on the transverse momentum spectra of charged particles in pPb Collisions at $\sqrt{s_{NN}}$ = 5.02 TeV. European Physical Journal C - Particles and Fields, 75:237.

Abstract

Transverse momentum spectra of charged particles are measured by the CMS experiment at the CERN LHC in pPb collisions at sNN−−−√=5.02 TeV , in the range 0.4<pT<120 GeV/c and pseudorapidity |η\textsccm|<1.8 in the proton–nucleon center-of-mass frame. For pT<10 GeV/c , the charged-particle production is asymmetric about η\textsccm=0 , with smaller yield observed in the direction of the proton beam, qualitatively consistent with expectations from shadowing in nuclear parton distribution functions (nPDF). A pp reference spectrum at s√=5.02 TeV is obtained by interpolation from previous measurements at higher and lower center-of-mass energies. The pT distribution measured in pPb collisions shows an enhancement of charged particles with pT>20 GeV/c compared to expectations from the pp reference. The enhancement is larger than predicted by perturbative quantum chromodynamics calculations that include antishadowing modifications of nPDFs.

Abstract

Transverse momentum spectra of charged particles are measured by the CMS experiment at the CERN LHC in pPb collisions at sNN−−−√=5.02 TeV , in the range 0.4<pT<120 GeV/c and pseudorapidity |η\textsccm|<1.8 in the proton–nucleon center-of-mass frame. For pT<10 GeV/c , the charged-particle production is asymmetric about η\textsccm=0 , with smaller yield observed in the direction of the proton beam, qualitatively consistent with expectations from shadowing in nuclear parton distribution functions (nPDF). A pp reference spectrum at s√=5.02 TeV is obtained by interpolation from previous measurements at higher and lower center-of-mass energies. The pT distribution measured in pPb collisions shows an enhancement of charged particles with pT>20 GeV/c compared to expectations from the pp reference. The enhancement is larger than predicted by perturbative quantum chromodynamics calculations that include antishadowing modifications of nPDFs.

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Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:18 February 2015
Deposited On:12 Feb 2016 13:32
Last Modified:08 Dec 2017 18:17
Publisher:Springer
ISSN:1434-6044
Free access at:PubMed ID. An embargo period may apply.
Publisher DOI:https://doi.org/10.1140/epjc/s10052-015-3435-4
PubMed ID:26069462
Other Identification Number:arXiv:1502.05387v2

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