CMS Collaboration, Adair, A., Boulahouache, C., et al.. "Measurement of the relative prompt production rate of χ c2 and χ c1 in pp collisions at √s=7 TeV." The European Physical Journal C, 72, no. 2251 (2012) http://dx.doi.org/10.1140/epjc/s10052-012-2251-3.
A measurement is presented of the relative prompt production rate of χ c2 and χ c1 with 4.6 fb−1 of data collected by the CMS experiment at the LHC in pp collisions at √s=7 TeV. The two states are measured via their radiative decays χ c→J/ψ+γ, with the photon converting into an e+e− pair for J/ψ rapidity |y(J/ψ)|<1.0 and photon transverse momentum p T(γ)>0.5 GeV/c. The measurement is given for six intervals of p T(J/ψ) between 7 and 25 GeV/c. The results are compared to theoretical predictions.
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