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Paper   IPM / Particles / 11637
School of Particles and Accelerator
  Title:   Prompt and non-prompt J/psi production in pp collisions at sqrt(s) = 7 TeV
  Author(s): 
1.  Hessamaddin Arfaei
2.  Hamed Bakhshiansohi
3.  Seyed Mohsen Etesami
4.  Ali Fahim
5.  Majid Hashemi
6.  Abideh Jafari
7.  Mohsen Khakzad
8.  A Mohammadi
9.  Mojtaba Mohammadi Najafabadi
10.  Saeid Paktinat Mehdiabadi
11.  Batool Safarzadeh
12.  Maryam Zeinali
  Status:   Submitted
  Journal: Eur. Phys. J. C
  Year:  2010
  Supported by:  IPM
  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 2.1 (stat.) 3.0 (syst.) 7.8(luminosity) nb for prompt J/psi mesons assuming unpolarized production and 26.0 1.4 (stat.) 1.6 (syst.) 2.9 (luminosity) nb for J/psi mesons from b-hadron decays.

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