Measurement of the ratio of $B_c^{+}$ branching fractions to $J/\psi {\pi }^{+}$ and $J/\psi {\mu }^{+}{\nu }_{\mu }$

Abstract

The first measurement that relates semileptonic and hadronic decay rates of the $B_c^{+}$ meson is performed using proton-proton collision data corresponding to 1.0 fb${}^{-1}$ of integrated luminosity collected with the LHCb detector. The measured value of the ratio of branching fractions, $\mathcal{B}(B_c^{+}\to J/\psi {\pi }^{+})/\mathcal{B}(B_c^{+}\to J/\psi {\mu }^{+}{\nu }_{\mu })=0.0469\pm 0.0028(stat.)\pm 0.0046(syst.)$, is at the lower end of available theoretical predictions.

arXiv comment20 pages, 4 figures

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