This paper reports the measurement of J / ψ 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 / 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 (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 / ψ cross sections are observed in p Pb relative to p p 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.
Sirunyan, A., Tumasyan, A., Adam, W., Asilar, E., Bergauer, T., Brandstetter, J., et al. (2017). Measurement of prompt and nonprompt J / ψ production in p p and p Pb collisions at √sNN=5.02TeV. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 77(4) [10.1140/epjc/s10052-017-4828-3].
Measurement of prompt and nonprompt J / ψ production in p p and p Pb collisions at √sNN=5.02TeV
BRIANZA, LUCA;BRIVIO, FRANCESCO;CIRIOLO, VINCENZO;DINARDO, MAURO EMANUELE;FIORENDI, SARA;GHEZZI, ALESSIO;GOVONI, PIETRO;MALBERTI, MARTINA;MANZONI, RICCARDO ANDREA;MORONI, LUIGI;PAGANONI, MARCO;PIGAZZINI, SIMONE;RAGAZZI, STEFANO;TABARELLI DE FATIS, TOMMASOPenultimo
;Lucchini, M;De Guio, F;
2017
Abstract
This paper reports the measurement of J / ψ 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 / 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 2File | Dimensione | Formato | |
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