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Measurement of prompt and nonprompt J/ψ production in pp and pPb collisions at √ sNN = 5.02 TeV
CMS Collaboration
CMS Collaboration
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Abstract
This paper reports the measurement of J/ψ meson production in proton–proton (pp) and proton–lead (pPb) 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 pp and pPb collisions, respectively. Prompt and nonprompt J/ψ 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 (pp) and −2.87<yCM<1.93 (pPb). The nuclear modification factor, RpPb, is measured as a function of both pT and yCM. Small modifications to the J/ψ cross sections are observed in pPb relative to pp collisions. The ratio of J/ψ 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/ψ production.
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2017-04-27
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SpringerOpen
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CMSCollaboration_2017.pdf
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Sirunyan, A.M., Tumasyan, A., Adam, W. et al. Eur. Phys. J. C (2017) 77: 269. https://doi.org/10.1140/epjc/s10052-017-4828-3