# 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 07 Faculty of Science > Physics Institute 530 Physics English 18 February 2015 12 Feb 2016 13:32 29 Sep 2017 08:57 Springer 1434-6044 PubMed ID. An embargo period may apply. https://doi.org/10.1140/epjc/s10052-015-3435-4 26069462 arXiv:1502.05387v2