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

The CMS collaboration
Phys.Lett. B772 (2017) 306-329, 2017

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 sNN=5.02TeV , as well as results from charm quark jets in proton–proton (pp) collisions at s=2.76 and 5.02 TeV . 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 sNN=5.02TeV 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 s=2.76 and 5.02 TeV , and is independent of the jet transverse momentum from 55 to 400  GeV/c .

  • cjet xsec 5TeV

    page 10, Fig. 6, left

    10.17182/hepdata.77602.v1/t1

    Inclusive charm-jet cross section (and fraction) in pp collisions at 5.02 TeV.

  • cjet xsec 2p76TeV

    page 10, Fig. 6, right

    10.17182/hepdata.77602.v1/t2

    Inclusive charm-jet cross section (and fraction) in pp collisions at 2.76 TeV

  • cjet pPb xsec and rpa

    page 11, Fig. 7

    10.17182/hepdata.77602.v1/t3

    Inclusive charm-jet cross section in pp and pPb collisions at 5.02 TeV, with nuclear modification factor RpA for c-jets

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