Nuclear effects on the transverse momentum spectra of charged particles in pPb collisions at √s[subscript NN] = 5.02 TeV
Author(s)Apyan, Aram; Barbieri, Richard Alexander; Bauer, Gerry P.; Busza, Wit; Cali, Ivan Amos; Chan, Matthew Hans; Di Matteo, Leonardo; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Gulhan, Doga Can; Klute, Markus; Lai, Yue Shi; Lee, Yen-Jie; Levin, Andrew Michael; Luckey, P. David, Jr.; Ma, Teng; Paus, Christoph M. E.; Ralph, Duncan Kelley; Roland, Christof E.; Roland, Gunther M.; Stephans, George S. F.; Stockli, Fabian; Sumorok, Konstanty C.; Velicanu, Dragos Alexandru; Veverka, Jan; Wyslouch, Boleslaw; Yang, Mingming; Zanetti, Marco; Zhukova, Victoria; ... Show more Show less
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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.
DepartmentMassachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science; Massachusetts Institute of Technology. School of Science
The European Physical Journal C
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
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