Measurements of the charm jet cross section and nuclear modification factor in pPb collisions at sqrt(s_NN) = 5.02 TeV

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 , as well as results from charm quark jets in proton–proton (pp) collisions at and 5.02. 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 in pPb collisions at of 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 and 5.02, and is independent of the jet transverse momentum from 55 to 400 .