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Prompt and non-prompt J/ ψ production in pp collisions at TeV

Prompt and non-prompt J/ ψ production in pp collisions at TeV,10.1140/epjc/s10052-011-1575-8,European Physical Journal C,V. Khachatryan,A. M. Sirunyan

Prompt and non-prompt J/ ψ production in pp collisions at TeV  
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V. Khachatryan, A. M. Sirunyan, A. Tumasyan, W. Adam, T. Bergauer, M. Dragicevic, J. Erö, C. Fabjan, M. Friedl, R. Frühwirth, V. M. Ghete, J. Hammerhttp://academic.research.microsoft.com/io.ashx?type=5&id=47930159&selfId1=0&selfId2=0&maxNumber=12&query=
The production of J/ψ mesons is studied in pp collisions at  TeV with the CMS experiment at the LHC. The measurement is based on a dimuon sample corresponding to an integrated luminosity of 314 nb−1. The J/ψ differential cross section is determined, as a function of the J/ψ 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/ψ) component. Integrated over J/ψ 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±2.1(stat.)±3.0(syst.)±7.8(luminosity) nb for prompt J/ψ mesons assuming unpolarized production and 26.0±1.4(stat.)±1.6(syst.)±2.9(luminosity) nb for J/ψ mesons from b-hadron decays.
Journal: European Physical Journal C - EUR PHYS J C , vol. 71, no. 3, pp. 1-26, 2011
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