Measurements of the Charm Jet Cross Section and Nuclear Modification Factor in pPb Collisions at √sNN = 5.02 TeV

Physics Letters B 2017
CERN international group of authors, Viesturs Veckalns

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

Keywords
Charm-tagging, CMS, Heavy ions, Heavy-flavor
DOI
10.1016/j.physletb.2017.06.053
Hyperlink
https://www.sciencedirect.com/science/article/pii/S0370269317305294?via%3Dihub

international group of authors, C., Veckalns, V. Measurements of the Charm Jet Cross Section and Nuclear Modification Factor in pPb Collisions at √sNN = 5.02 TeV. Physics Letters B, 2017, Vol.772, pp.306-329. ISSN 0370-2693. Available from: doi:10.1016/j.physletb.2017.06.053

Publication language
English (en)