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Title
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Nuclear effects on the transverse momentum spectra of charged particles in pPb collisions 5.02 TeV
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Author
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Institution/Organisation
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CMS Collaboration
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Abstract
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| Transverse momentum spectra of charged particles are measured by the CMS experiment at the CERN LHC in pPb collisions at root s(NN) = 5.02 TeV, in the range 0.4 < pT < 120 GeV/c and pseudorapidity |eta(CM)| < 1.8 in the proton-nucleon center-of-mass frame. For p(T) < 10 GeV/c, the charged-particle production is asymmetric about eta(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 root s = 5.02 TeV is obtained by interpolation from previous measurements at higher and lower center-of-mass energies. The p(T) distribution measured in pPb collisions shows an enhancement of charged particles with p(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. |
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Language
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English
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Source (journal)
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European physical journal : C : particles and fields. - Berlin
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Publication
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Berlin
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2015
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ISSN
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1434-6044
1434-6052
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DOI
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10.1140/EPJC/S10052-015-3435-4
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Volume/pages
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75
:5
(2015)
, 25 p.
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ISI
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000355681400005
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Full text (Publisher's DOI)
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Full text (open access)
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