Measurement of prompt and nonprompt J/{ψ } production in pp and pPb collisions at √{s_{NN}} =5.02 {TeV}
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 5.02 {TeV} by the CMS experiment at the LHC. 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/{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 <30{ {GeV}/{c}} , and center-of-mass rapidity ranges of |y_{CM} |<2.4 (pp) and -2.87<y_{CM}<1.93 (pPb). The nuclear modification factor, R_{pPb}, is measured as a function of both pT and y_{CM}. 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, R_{FB}, studied as functions of pT and y_{CM}, 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.
- Publication:
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European Physical Journal C
- Pub Date:
- April 2017
- DOI:
- 10.1140/epjc/s10052-017-4828-3
- Bibcode:
- 2017EPJC...77..269S