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

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 400 GeV/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 5.02TeV, and is independent of the jet transverse momentum from 55 to 400 GeV/c.

 Fuente: Physics Letters B 772 (2017) 306-329

 Editorial: Elsevier

 Fecha de publicación: 01/09/2017

 Nº de páginas: 24

 Tipo de publicación: Artículo de Revista

 DOI: 10.1016/j.physletb.2017.06.053

 ISSN: 0370-2693,1873-2445

 Url de la publicación: https://doi.org/10.1016/j.physletb.2017.06.053