# Transverse momentum spectra of inclusive b jets in pPb collisions at $\sqrt{^{s}NN}$ = 5.02 TeV

CMS Collaboration; Canelli, F; Chiochia, V; Kilminster, B; Robmann, P; et al (2016). Transverse momentum spectra of inclusive b jets in pPb collisions at $\sqrt{^{s}NN}$ = 5.02 TeV. Physics Letters B, 754:59.

## 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 ex- ploiting the long lifetime of hadrons containing a b quark through tagging meth- ods using distributions of the secondary vertex mass and displacement. Extracted cross sections for b jets are scaled by the effective number of nucleon-nucleon colli- sions 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 |ηlab| < 2. We also compare this result to predictions from models using perturbative calculations in quantum chromodynamics.

## 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 ex- ploiting the long lifetime of hadrons containing a b quark through tagging meth- ods using distributions of the secondary vertex mass and displacement. Extracted cross sections for b jets are scaled by the effective number of nucleon-nucleon colli- sions 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 |ηlab| < 2. We also compare this result to predictions from models using perturbative calculations in quantum chromodynamics.

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