Nuclear effects on the transverse momentum spectra of charged particles in pPb collisions at √s[subscript NN] = 5.02 TeV
Name
Khachatryan-2015-Nuclear effects on t.pdf
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1.18 MB
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Checksum (MD5)
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Author(s)
Apyan, Aram
Barbieri, Richard Alexander
Busza, Wit
Cali, Ivan Amos
Di Matteo, Leonardo
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Gulhan, Doga Can
Klute, Markus
Lai, Yue Shi
Date Issued
May 2015
Journal
The European Physical Journal C
Publisher
Springer-Verlag
Citation
Khachatryan, V., A. M. Sirunyan, A. Tumasyan, W. Adam, T. Bergauer, M. Dragicevic, J. Erö, et al. “Nuclear Effects on the Transverse Momentum Spectra of Charged Particles in pPb Collisions at √s[subscript NN] = 5.02 TeV.” The European Physical Journal C 75, no. 5 (May 2015). © 2015 CERN for the benefit of the CMS collaboration
Version
Final published version
Abstract
Transverse momentum spectra of charged particles are measured by the CMS experiment at the CERN LHC in pPb collisions at √s[subscript NN] = 5.02 TeV, in the range 0.4 < p[subscript T] < 120 GeV/c and pseudorapidity |η[subscript CM]| < 1.8 in the proton–nucleon center-of-mass frame. For p[subscript T] < 10 GeV/c, the charged-particle production is asymmetric about η[subscript CM] = 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 p[subscript T] distribution measured in pPb collisions shows an enhancement of charged particles with p[subscript T] > 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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Massachusetts Institute of Technology. School of Science
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DOI of Published Version
https://doi.org/10.1140/epjc/s10052-015-3435-4
