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 GeV 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 chromodynamics calculations that include antishadowing modifications of nPDFs.

Replaced with published version. Added journal reference and DOI

References in corpus (11)

• PYTHIA 6.4 Physics and Manual
• New parton distributions for collider physics
• Glauber Modeling in High Energy Nuclear Collisions
• Implications of CTEQ global analysis for collider observables
• EPS09 - a New Generation of NLO and LO Nuclear Parton Distribution Functions
• Description and performance of track and primary-vertex reconstruction with the CMS tracker
• Observation of long-range near-side angular correlations in proton-lead collisions at the LHC
• Global analysis of fragmentation functions for pions and kaons and their uncertainties
• Measurements of the Nuclear Modification Factor for Jets in Pb+Pb Collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV with the ATLAS Detector
• The PHOBOS Glauber Monte Carlo
• Transverse momentum dependence of inclusive primary charged-particle production in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV

Cited by in corpus (3)

• Measurement of charged pion, kaon, and proton production in proton-proton collisions at sqrt(s) = 13 TeV
• Diffractive and non-diffractive wounded nucleons and final states in pA collisions
• Scattering off the Color Glass Condensate