J/ψ and ψ(2S) production in pp collisions at √s = 7 Tev
Author(s)
CMS Collaboration; Alver, Burak Han; Bauer, Gerry P; Bendavid, Joshua L.; Busza, Wit; Butz, Erik M.; Cali, Ivan Amos; Dutta, Valentina; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Hahn, Kristian Allan; Harris, Philip Coleman; Klute, Markus; Lee, Yen-Jie; Luckey Jr, P David; Ma, Teng; Nahn, Steven; Paus, Christoph M. E.; Ralph, Duncan Kelley; Roland, Christof E; Roland, Gunther M; Rudolph, Matthew Scott; Stephans, George S. F.; Stoeckli, Fabian; Sumorok, Konstanty C; Sung, Kevin Kai Hong; Velicanu, Dragos Alexandru; Wenger, Edward Allen; Wolf, Roger; Wyslouch, Boleslaw; Xie, Si; Yang, Ming; Yilmaz, Yetkin; Yoon, A. S.; Zanetti, Marco; Chan, M.; Kim, Y.; Li, W.; ... Show more Show less
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A measurement of the J/ ψ and ψ (2S) production cross sections in pp collisions at √s = 7TeV with the CMS experiment at the LHC is presented. The data sample corresponds to an integrated luminosity of 37 pb ⁻¹. Using a fit to the invariant mass and decay length distributions, production cross sections have been measured separately for prompt and non-prompt charmonium states, as a function of the meson transverse momentum in several rapidity ranges and integrated in the kinematical regions considered in this study. In addition, cross sections restricted to the acceptance of the CMS detector are given, which are not affected by the polarization of the charmonium states. The ratio of the differential production cross sections of the two states, where systematic uncertainties largely cancel, is also determined. The branching fraction of the inclusive B → ψ (2S)X decay is extracted from the ratio of the non-prompt cross sections to be: B(B → ψ (2S)X) = (3:08 ± 0:12 (stat.+syst.) ± 0:13 (theor.) ± 0:42 (BPDG)) × 10 -3 : B(B → ψ(2S)X) = (3.08 ± 0.12 (stat.+syst.) ± 0.13 (theor.) ± 0.42 (B PDG )) × 10 ⁻³.
Date issued
2012-02Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear ScienceJournal
Journal of High Energy Physics
Publisher
Springer Berlin Heidelberg
Citation
Chatrchyan, S. et al. “J/ψ and ψ(2S) production in pp collisions at √s = 7 Tev.” Journal of High Energy Physics 2012, 2 (February 2012) © 2012 SISSA
Version: Final published version
ISSN
1029-8479