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Nuclear effects on the transverse momentum spectra of charged particles in pPb collisions at sNN−−−√=5.02 TeV
Baringer, Philip S. Bean, Alice Murray, Michael J. Sanders, Stephen J. CMS Collaboration
Baringer, Philip S.
Bean, Alice
Murray, Michael J.
Sanders, Stephen J.
CMS Collaboration
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Abstract
Transverse momentum spectra of charged particles are measured by the CMS experiment at the CERN LHC in pPb collisions at sNN−−−√=5.02TeV, in the range 0.4<pT<120GeV/c and pseudorapidity |ηCM|<1.8 in the proton–nucleon center-of-mass frame. For pT<10GeV/c, the charged-particle production is asymmetric about ηCM=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√=5.02TeV 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>20GeV/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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Date
2015-05-29
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Springer Verlag
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Keywords
CMS, Physics, Relativistic heavy-ion collisions
Citation
Khachatryan, V., Sirunyan, A. M., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., … Ghete, V. M. (2015). Nuclear effects on the transverse momentum spectra of charged particles in pPb collisions at sNN−−−√=5.02 TeV. The European Physical Journal C, 75(5). doi:10.1140/epjc/s10052-015-3435-4