# 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.

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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7 citations in Web of Science®
4 citations in Scopus®

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Item Type: Journal Article, refereed, original work 07 Faculty of Science > Physics Institute 530 Physics English 18 February 2015 12 Feb 2016 13:32 05 Apr 2016 20:03 Springer 1434-6044 Publisher DOI. An embargo period may apply. https://doi.org/10.1140/epjc/s10052-015-3435-4 26069462 arXiv:1502.05387v2
Permanent URL: https://doi.org/10.5167/uzh-121373

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