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 (16)

• The ALICE experiment: a journey through QCD
• The Muon Puzzle in cosmic-ray induced air showers and its connection to the Large Hadron Collider
• Heavy quarks and jets as probes of the QGP
• Probing the partonic degrees of freedom in high multiplicity p-Pb collisions at $\sqrt{s_{NN}}=$ 5.02 TeV
• Predicting parton energy loss in small collision systems
• 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
• Progress and Challenges in Small Systems
• $\gamma$-hadron spectra in p + Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
• Nuclear modification factor of neutral pions in the forward and backward regions in $p$-Pb collisions
• Disentangling centrality bias and final-state effects in the production of high-$p_T$ ${\pi }^0$ using direct $\gamma$ in $d$$+$Au collisions at $\sqrt{s_{{}_{NN}}}=200$ GeV
• Ratios of jet and hadron spectra at LHC energies: measuring high-$p_T$ suppression without a $pp$ reference
• Production of $\Lambda$ and ${\mathrm{K}}_{\mathrm{S}}^0$ in jets in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV and pp collisions at $\sqrt{s}=7$ TeV
• Production of $\eta$ and ${\eta }^{\prime }$ mesons in $pp$ and $p$Pb collisions
• Observation of suppressed charged-particle production in ultrarelativistic oxygen-oxygen collisions
• Scattering off the Color Glass Condensate