Measurement of the relative prompt production rate of χ c2 and χ c1 in pp collisions at 详细信息    查看全文
文摘
A measurement is presented of the relative prompt production rate of χ c2 and χ c1 with 4.6?fb? of data collected by the CMS experiment at the LHC in pp collisions at $\sqrt{s}= 7~\mathrm{TeV}$ . The two states are measured via their radiative decays χ c→J/ψ+γ, with the photon converting into an e+e?/sup> 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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