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Measurements of the charm jet cross section and nuclear modification factor in pPb collisions at √sNN = 5.02 TeV
Journal article   Open access   Peer reviewed

Measurements of the charm jet cross section and nuclear modification factor in pPb collisions at √sNN = 5.02 TeV

CMS Collaboration
Physics letters B Nuclear, elementary particle and high-energy physics, Vol.772, pp.306-329
09/10/2017
DOI: 10.1016/j.physletb.2017.06.053
url
https://doi.org/10.1016/j.physletb.2017.06.053View
Published (Version of record) Open Access

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 = 5.02 TeV, 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 = 5.02 TeV 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.
CMS Heavy ions Charm-tagging Heavy-flavor

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