Measurement of the ratio of prompt χ c to J/ψ production in pp collisions at √s=7 TeV

The LHCb Collaboration

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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/ψγ 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/ψγ)/σ(J/ψ), is determined as a function of the J/ψ transverse momentum in the range 2<pTJ/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 pTJ/ψ region.

Original languageEnglish
Pages (from-to)431-440
Number of pages10
JournalPhysics Letters B
Issue number2
Publication statusPublished - 5 Dec 2012
Externally publishedYes

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