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Measurement of the ratio of prompt χ c to J / ψ production in pp collisions at sqrt(s) = 7 TeV
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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
Abstract
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 |
| ISSN: | 0370-2693 |
| Date: | 5 December 2012 |
| Volume: | Vol.718 |
| Number: | No.2 |
| Page Range: | pp. 431-440 |
| Identification Number: | 10.1016/j.physletb.2012.10.068 |
| Status: | Peer Reviewed |
| Publication Status: | Published |
| Access rights to Published version: | Restricted or Subscription Access |
| URI: | http://wrap.warwick.ac.uk/id/eprint/52154 |
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