Measurements of the charm jet cross section and nuclear modification factor in pPb collisions at $\sqrt{s_{NN}} = 5.02$ TeV

Abstract

The CMS Collaboration presents the first measurement of the differential cross section of jets from charm quarks produced in proton–lead (pPb) collisions at a nucleon–nucleon center-of-mass energy of $\sqrt{s_{NN}} = 5.02$ TeV, as well as results from charm quark jets in proton–proton (pp) collisions at $\sqrt{s}$ = 2.76 and 5.02TeV. By comparing the yields of the pPb and pp collision systems at the same energy, a nuclear modification factor for charm jets from 55 to 400 GeV/c in pPb collisions at $\sqrt{s_{NN}} = 5.02$ TeV of RpA=0.92±0.07(stat)±0.11(syst) is obtained. This is consistent with an absence of final-state energy loss for charm quarks in pPb collisions. In addition, the fraction of jets coming from charm quarks is found to be consistent with that predicted by pythia 6 for pp collisions at $\sqrt{s}$ = 2.76 and 5.02 TeV, and is independent of the jet transverse momentum from 55 to 400 GeV/c.

Abstract

The CMS Collaboration presents the first measurement of the differential cross section of jets from charm quarks produced in proton–lead (pPb) collisions at a nucleon–nucleon center-of-mass energy of $\sqrt{s_{NN}} = 5.02$ TeV, as well as results from charm quark jets in proton–proton (pp) collisions at $\sqrt{s}$ = 2.76 and 5.02TeV. By comparing the yields of the pPb and pp collision systems at the same energy, a nuclear modification factor for charm jets from 55 to 400 GeV/c in pPb collisions at $\sqrt{s_{NN}} = 5.02$ TeV of RpA=0.92±0.07(stat)±0.11(syst) is obtained. This is consistent with an absence of final-state energy loss for charm quarks in pPb collisions. In addition, the fraction of jets coming from charm quarks is found to be consistent with that predicted by pythia 6 for pp collisions at $\sqrt{s}$ = 2.76 and 5.02 TeV, and is independent of the jet transverse momentum from 55 to 400 GeV/c.

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