Prompt production of charmonium Χ c0, Χ c1 and Χ c2 mesons is studied using proton-proton collisions at the LHC at a centre-of-mass energy of √s = 7TeV. The Χ c mesons are identified through their decay to J/Φ,γ with J/Φ → μ +μ - using photons that converted in the detector. A data sample, corresponding to an integrated luminosity of 1.0 fb -1 collected by the LHCb detector, is used to measure the relative prompt production rate of Χ c1 and Χ c2 in the rapidity range 2:0 < y < 4:5 as a function of the J/Φ transverse momentum from 3 to 20 GeV=c. First evidence for Χ c0 meson production at a high-energy hadron collider is also presented.
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All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics