Measurement of prompt and nonprompt J/psi production in pp and pPb collisions at sqrt(s[NN]) = 5.02 TeV

The CMS collaboration
Sirunyan, Albert M , Tumasyan, Armen , Adam, Wolfgang , Aşılar, Ece , Bergauer, Thomas , Brandstetter, Johannes , Brondolin, Erica , Dragicevic, Marko , Erö, Janos , Flechl, Martin
Eur.Phys.J.C 77 (2017) 269, 2017.

Abstract (data abstract)
CERN-LHC. Measurements of J/$\psi$ meson production in proton-proton (pp) and proton-lead (pPb) collisions at a center-of-mass energy per nucleon pair of 5.02 TeV by the CMS experiments at the LHC are reported. The data samples used in the analysis correspond to integrated luminosities of 28 pb$^{-1}$ and 35 nb$^{-1}$ for pp and pPb collisions, respectively. Prompt and nonprompt J/$\psi$ 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$<p_{\mathrm{T}}<$30 GeV/c, and center-of-mass rapidity of $|y_{\mathrm{CM}}|<$2.4 (pp) and -2.87$<y_{\mathrm{CM}}<$1.93 (pPb). The nuclear modification factor, $R_{\mathrm{pPb}}$ is measured as a function of both $p_{\mathrm{T}}$ and $y_{\mathrm{CM}}$. Small modifications to the J/$\psi$ cross sections are observed in pPb relative to pp collisions. The ratio of production cross sections in p-going and Pb-going directions ,$R_{\mathrm{pPb}}$, studied as functions of $p_{\mathrm{T}}$ and $y_{\mathrm{CM}}$, shows a significant decrease for increasing transverse energy deposited at large pesudorapidities. These results, which cover a wide kinematic range, provide new insight on the role of cold nuclear matter effects on prompt and nonprompt J/$\psi$ production. See arXiv:1702.01462 for more details.

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