Dielectron production in Au + Au collisions at √sNN=200 GeV

Adare, A. and Aidala, C. and Ajitanand, N. N. and Akiba, Y. and Akimoto, R. and Csanád, Máté and Csörgő, Tamás and Imrek, József and Kiss, Ádám and Nagy, Márton and Novák, Tamás and Ster, András and Sziklai, János István and Vargyas, Márton and Vértesi, Róbert (2016) Dielectron production in Au + Au collisions at √sNN=200 GeV. PHYSICAL REVIEW C, 93 (1). ISSN 2469-9985

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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.

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