Measurement of prompt and nonprompt J / ? production in p p and p Pb collisions at ?sNN=5.02TeV

Date

2017-04-27

Authors

Sirunyan, A. M.
Tumasyan, A.
Adam, W.
Asilar, E.
Bergauer, T.
Brandstetter, J.
Brondolin, E.
Dragicevic, M.
Erö, J.
Flechl, M.

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Abstract

This paper reports the measurement of J / ? meson production in proton–proton (p p) and proton–lead (p Pb) collisions at a center-of-mass energy per nucleon pair of 5.02TeV by the CMS experiment at the LHC. The data samples used in the analysis correspond to integrated luminosities of 28pb-1 and 35nb-1 for p p and p Pb collisions, respectively. Prompt and nonprompt J / ? mesons, the latter produced in the decay of B hadrons, are measured in their dimuon decay channels. Differential cross sections are measured in the transverse momentum range of 2<pT<30GeV/c, and center-of-mass rapidity ranges of | yCM| < 2.4 (p p) and - 2.87 < yCM< 1.93 (p Pb). The nuclear modification factor, Rp Pb, is measured as a function of both pT and yCM. Small modifications to the J / ? cross sections are observed in p Pb relative to p p collisions. The ratio of J / ? production cross sections in p -going and Pb-going directions, RFB, studied as functions of pT and yCM, shows a significant decrease for increasing transverse energy deposited at large pseudorapidities. These results, which cover a wide kinematic range, provide new insight on the role of cold nuclear matter effects on prompt and nonprompt J / ? production. © 2017, CERN for the benefit of the CMS collaboration.

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Citation: Sirunyan, A. M., Tumasyan, A., Adam, W., Asilar, E., Bergauer, T., Brandstetter, J., . . . Collaboration, C. M. S. (2017). Measurement of prompt and nonprompt J / ? production in p p and p Pb collisions at ?sNN=5.02TeV. European Physical Journal C, 77(4). doi:10.1140/epjc/s10052-017-4828-3

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