We present a measurement of b jet transverse momentum (pT) 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 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.

Khachatryan, V., Sirunyan, A., Tumasyan, A., Adam, W., Asilar, E., Bergauer, T., et al. (2016). Transverse momentum spectra of inclusive b jets in pPb collisions at √sNN=5.02 TeV. PHYSICS LETTERS. SECTION B, 754, 59-80 [10.1016/j.physletb.2016.01.010].

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

Brianza, L.;Dinardo, M. E.;Fiorendi, S.;Gerosa, R.;Ghezzi, A.;Govoni, P.;Manzoni, R. A.;Marzocchi, B.;Paganoni, M.;Ragazzi, S.;Tabarelli de Fatis, T.;De Guio, F.;Lucchini, M. T.;
2016

Abstract

We present a measurement of b jet transverse momentum (pT) 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 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.
Articolo in rivista - Articolo scientifico
b-tagging; CMS; Heavy ions; Physics;
B-tagging; CMS; Heavy ions; Physics; Nuclear and High Energy Physics
English
2016
754
59
80
none
Khachatryan, V., Sirunyan, A., Tumasyan, A., Adam, W., Asilar, E., Bergauer, T., et al. (2016). Transverse momentum spectra of inclusive b jets in pPb collisions at √sNN=5.02 TeV. PHYSICS LETTERS. SECTION B, 754, 59-80 [10.1016/j.physletb.2016.01.010].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/187794
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