Measurement of the relative prompt production rate of χ c2 and χ c1 in pp collisions at [Formula: see text].

2012 
A measurement is presented of the relative prompt production rate of χc2 and χc1 with 4.6 fb−1 of data collected by the CMS experiment at the LHC in pp collisions at . The two states are measured via their radiative decays χc→J/ψ+γ, with the photon converting into an e+e− pair for J/ψ rapidity |y(J/ψ)| 0.5 GeV/c. The measurement is given for six intervals of pT(J/ψ) between 7 and 25 GeV/c. The results are compared to theoretical predictions.
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