Prompt and non-prompt J/psi production in pp collisions at sqrt(s) = 7 TeV

8 CMS
IP2I Lyon - Institut de Physique des 2 Infinis de Lyon
Abstract : The production of J/psi mesons is studied in pp collisions at sqrt(s)=7 TeV with the CMS experiment at the LHC. The measurement is based on a dimuon sample corresponding to an integrated luminosity of 314 inverse nanobarns. The J/psi differential cross section is determined, as a function of the J/psi transverse momentum, in three rapidity ranges. A fit to the decay length distribution is used to separate the prompt from the non-prompt (b hadron to J/psi) component. Integrated over J/psi transverse momentum from 6.5 to 30 GeV/c and over rapidity in the range |y| < 2.4, the measured cross sections, times the dimuon decay branching fraction, are 70.9 \pm 2.1 (stat.) \pm 3.0 (syst.) \pm 7.8(luminosity) nb for prompt J/psi mesons assuming unpolarized production and 26.0 \pm 1.4 (stat.) \pm 1.6 (syst.) \pm 2.9 (luminosity) nb for J/psi mesons from b-hadron decays.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00537749
Contributor : Dominique Girod <>
Submitted on : Friday, November 19, 2010 - 10:48:43 AM
Last modification on : Monday, June 28, 2021 - 3:56:02 PM

Citation

V. Khachatryan, D. Sillou, M. Besancon, M. Dejardin, D. Denegri, et al.. Prompt and non-prompt J/psi production in pp collisions at sqrt(s) = 7 TeV. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2011, 71, pp.1575. ⟨10.1140/epjc/s10052-011-1575-8⟩. ⟨in2p3-00537749⟩

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