Nuclear Modification Factor RpA of b jets in pPb collisions

Collaboration
2014
12 pages
Report number:
  • CMS-PAS-HIN-14-007
Experiments:

Citations per year

201420152016201720183201
Abstract:
We present a measurement of the nuclear modification factor RpAPYTHIAR_{\mathrm{pA}}^{\mathrm{PYTHIA}} of b jets in proton-lead collisions from CMS. Jets from b-quark fragmentations are found by exploiting the long lifetime of the b-quark through tagging methods using distributions of the secondary vertex displacement. From these, b-jet cross-sections are calculated and compared to a pp cross-section obtained from a PYTHIA simulation. The RpAPYTHIAR_{\mathrm{pA}}^{\mathrm{PYTHIA}} is consistent with unity within systematic uncertainties and may show slight enhancement due to cold nuclear matter effects for a wide range in pseudorapidity. These effects are qualitatively consistent with the observed value for the inclusive jet RpAR_{\mathrm{pA}}. We use 35 nb1^{-1} of proton-lead data collected during the 2013 heavy-ion run at the LHC.
Note:
  • Preliminary results
  • Data
  • jet: bottom
  • nuclear matter: effect
  • bottom: particle identification
  • track data analysis
  • vertex: secondary
  • PYTHIA
  • p nucleus: inclusive reaction
  • CERN LHC Coll
  • heavy ion: scattering