Measurement of the ratio of prompt χ c to J / ψ production in pp collisions at sqrt(s) = 7 TeV
LHCb Collaboration (Including:). (2012) Measurement of the ratio of prompt χ c to J / ψ production in pp collisions at sqrt(s) = 7 TeV. Physics Letters B, Vol.718 (No.2). pp. 431-440. ISSN 0370-2693 Full text not available from this repository.
Official URL: http://dx.doi.org/10.1016/j.physletb.2012.10.068
The prompt production of charmonium χ c and J / ψ states is studied in proton-proton collisions at a centre-of-mass energy of sqrt(s) = 7 TeV at the Large Hadron Collider. The χ c and J / ψ mesons are identified through their decays χ c → J / ψ γ and J / ψ → μ + μ - using 36 pb - 1 of data collected by the LHCb detector in 2010. The ratio of the prompt production cross-sections for χ c and J / ψ, σ (χ c → J / ψ γ) / σ (J / ψ), is determined as a function of the J / ψ transverse momentum in the range 2 < p T J / ψ < 15 GeV / c. The results are in excellent agreement with next-to-leading order non-relativistic expectations and show a significant discrepancy compared with the colour singlet model prediction at leading order, especially in the low p T J / ψ region. © 2012 CERN.
|Item Type:||Journal Article|
|Divisions:||Faculty of Science > Physics|
|Journal or Publication Title:||Physics Letters B|
|Publisher:||Elsevier Science BV|
|Date:||5 December 2012|
|Page Range:||pp. 431-440|
|Access rights to Published version:||Restricted or Subscription Access|
Actions (login required)