Nuclear effects on the transverse momentum spectra of charged particles in pPb collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV

Abstract : Transverse momentum spectra of charged particles are measured by the CMS experiment at the CERN LHC in pPb collisions at sqrt(s[NN]) =5.02 TeV, in the range 0.4 < pt < 120 GeVc and pseudorapidity abs(eta[CM]) < 1.8 in the proton-nucleon center-of-mass frame. For pt < 10 GeV, 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 sqrt(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 compared to expectations from the pp reference. The enhancement is larger than predicted by perturbative quantum chromodynamic calculations that include antishadowing modifications of nPDFs.
Type de document :
Article dans une revue
European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2015, 75, pp.237. 〈10.1140/epjc/s10052-015-3435-4〉
Domaine :

http://hal.in2p3.fr/in2p3-01126679
Contributeur : Dominique Girod <>
Soumis le : vendredi 6 mars 2015 - 15:28:05
Dernière modification le : jeudi 10 mai 2018 - 01:59:22

Citation

V. Khachatryan, M. Besancon, F. Couderc, M. Dejardin, D. Denegri, et al.. Nuclear effects on the transverse momentum spectra of charged particles in pPb collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2015, 75, pp.237. 〈10.1140/epjc/s10052-015-3435-4〉. 〈in2p3-01126679〉

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