Transverse momentum spectra of inclusive b jets in pPb collisions at √s NN =5.02 TeV
Journal
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Journal Volume
754
Pages
59-80
Date Issued
2016
Author(s)
Abstract
We present a measurement of b jet transverse momentum (p T ) spectra in proton-lead (pPb) collisions using a dataset corresponding to about 35 nb -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 p T between 55 and 400 GeV/c and with | lab | < 2. We also compare this result to predictions from models using perturbative calculations in quantum chromodynamics.
Type
journal article