Transverse momentum spectra of inclusive b jets in pPb collisions at √sNN = 5.02 TeV

CMS Collaboration

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30 Citations (Scopus)

Abstract

We present a measurement of b jet transverse momentum (pT) spectra in proton-lead (pPb) collisions using a dataset corresponding to about 35nb−1 collected with the CMS detector at the LHC. Jets from b quark fragmentation are found by exploiting the long lifetime of hadrons containing a b quark through tagging methods using distributions of the secondary vertex mass and displacement. Extracted cross sections for b jets are scaled by the effective number of nucleon–nucleon collisions and are compared to a reference obtained from pythia simulations of pp collisions. The pythia-based estimate of the nuclear modification factor is found to be 1.22 ±0.15 (stat+syst pPb) ±0.27 (syst pythia) averaged over all jets with pT between 55 and 400 GeV/c and with |ηlab| < 2. We also compare this result to predictions from models using perturbative calculations in quantum chromodynamics.
Original languageEnglish
Pages (from-to)59-80
Number of pages22
JournalPhysics Letters B
Volume754
DOIs
Publication statusPublished - 2016
Externally publishedYes

Keywords

  • CMS
  • Physics
  • Heavy ions
  • b-tagging

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