  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.
