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Measurement of the ratio of prompt χ c to J / ψ production in pp collisions at √s = 7 TeV
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LHCb Collaboration (Including: Back, J. J., Dossett, D., Gershon, T. J., Harrison, P. F., Kreps, Michal, Latham, Thomas, Pilar, T., Poluektov, Anton, Reid, Matthew M., Silva Coutinho, R., Whitehead, M. (Mark) and Williams, M. P.). (2012) Measurement of the ratio of prompt χ c to J / ψ production in pp collisions at √s = 7 TeV. Physics Letters B, Volume 718 (Number 2). pp. 431-440. doi:10.1016/j.physletb.2012.10.068 ISSN 0370-2693.
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WRAP_LHCb_1-s2.0-S0370269312011343-main.pdf - Published Version Available under License Creative Commons Attribution. Download (717Kb) | Preview |
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 √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.
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