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.B 772 (2017) 306-329, 2017.

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 5.02 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 sqrt(s[NN]) = 5.02 TeV of R[pA] = 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.

  • cjet xsec 5TeV

    page 10, Fig. 6, left


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

  • cjet xsec 2p76TeV

    page 10, Fig. 6, right


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

  • cjet pPb xsec and rpa

    page 11, Fig. 7


    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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