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

The CMS collaboration

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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 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.

Original languageEnglish
Pages (from-to)306-329
Number of pages24
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume772
DOIs
Publication statusPublished - 10 Sep 2017

Keywords

  • Charm-tagging
  • CMS
  • Heavy ions
  • Heavy-flavor
  • HEAVY QUARKS
  • PERSPECTIVE
  • RECONSTRUCTION
  • QUARK-GLUON PLASMA
  • PB COLLISIONS

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