Measurement of the branching fraction ratio $\mathcal{B}(B_c^{+}\to \psi (2S){\pi }^{+})/\mathcal{B}(B_c^{+}\to J/\psi {\pi }^{+})$

Abstract

Using $pp$ collision data collected by LHCb at center-of-mass energies $\sqrt{s}$ = 7 TeV and 8 TeV, corresponding to an integrated luminosity of 3 fb${}^{-1}$, the ratio of the branching fraction of the $B_c^{+}\to \psi (2S){\pi }^{+}$ decay relative to that of the $B_c^{+}\to J/\psi {\pi }^{+}$ decay is measured to be 0.268 $\pm$ 0.032 (stat) $\pm$ 0.007 (syst) $\pm$ 0.006 (BF). The first uncertainty is statistical, the second is systematic, and the third is due to the uncertainties on the branching fractions of the $J/\psi \to {\mu }^{+}{\mu }^{-}$ and $\psi (2S)\to {\mu }^{+}{\mu }^{-}$ decays. This measurement is consistent with the previous LHCb result, and the statistical uncertainty is halved.

17 pages including author list, 2 figures

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• Evidence for the decay $B_c^{+}\to J/\psi 3{\pi }^{+}2{\pi }^{-}$

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