Measurements of the charm jet cross section and nuclear modification factor in pPb collisions at √sNN = 5.02 TeV
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Date
2017-09-10
Publication Type
Journal Article
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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=5.02TeV, 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 400GeV/c in pPb collisions at √sNN=5.02TeV 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 to400 GeV/c.
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published
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Journal / series
Volume
772
Pages / Article No.
306 - 329
Publisher
Elsevier
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Subject
CMS; Heavy ions; Charm-tagging; Heavy-flavor
Organisational unit
03593 - Dissertori, Günther / Dissertori, Günther
03904 - Wallny, Rainer / Wallny, Rainer
08803 - Grab, Christoph (Tit.Prof.)
03381 - Pauss, Felicitas (emeritus)