Measurement of the cross-section ratio σ(χc2)/σ(χc1) for prompt χc production at s=7 TeV

The LHCb Collaboration

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The prompt production of the charmonium χc1 and χc2 mesons has been studied in proton-proton collisions at the Large Hadron Collider at a centre-of-mass energy of s=7 TeV. The χc mesons are identified through their decays χc→J/ψγ with 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 the two χc spin states, σ(χc2)/σ(χc1), has been determined as a function of the J/ψ transverse momentum, pTJ/ψ, in the range from 2 to 15 GeV/c. The results are in agreement with the next-to-leading order non-relativistic QCD model at high pTJ/ψ and lie consistently above the pure leading-order colour-singlet prediction.

Original languageEnglish
Pages (from-to)215-223
Number of pages9
JournalPhysics Letters B
Issue number2-5
Publication statusPublished - 14 Aug 2012
Externally publishedYes

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