Measurement of Bc(2S)+ and Bc*(2S)+ cross section ratios in proton-proton collisions at sqrt(s) = 13 TeVстатья
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Аннотация:The ratios of the Bc(2S)+ to B+c, B∗c(2S)+ to B+c, and B∗c(2S)+ to Bc(2S)+ production cross sections are measured in proton-proton collisions at s√= 13 TeV, using a data sample collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 143 fb−1. The three measurements are made in the B+c meson phase space region defined by the transverse momentum pT > 15 GeV and absolute rapidity |y| < 2.4, with the excited B(∗)c(2S)+ states reconstructed through the B(∗)+cπ+π−, followed by the B+c → J/ψπ+ and J/ψ → μ+μ− decays. The Bc(2S)+ to B+c, B∗c(2S)+ to B+c, and B∗c(2S)+ to Bc(2S)+ cross section ratios, including the unknown B(∗)c(2S)+ → B(∗)+cπ+π− branching fractions, are (3.47 ± 0.63 (stat) ± 0.33 (syst))%, (4.69 ± 0.71 (stat) ± 0.56 (syst))%, and 1.35 ± 0.32 (stat) ± 0.09 (syst), respectively. None of these ratios shows a significant dependence on the pT or |y| of the Bc meson. The normalized dipion invariant mass distributions from the decays B(∗)c(2S)+ → B(∗)c+π+π− are also reported.