/ nucl-ex CMS-HIN-14-007

Transverse momentum spectra of b jets in pPb collisions at sqrt(s[NN]) = 5.02 TeV

Pages: 32

Abstract: We present a measurement of b jet transverse momentum (pt) spectra in proton-lead (pPb) collisions using a dataset corresponding to about 35 inverse nanobarns 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 abs(eta[lab])<2. We also compare this result to predictions from models using perturbative calculations in quantum chromodynamics.

Note: Submitted to Phys. Lett. B

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