Measurement of the ratio of branching fractions $\mathcal{B}(B_c^+\,\to\,J/ψτ^+ν_τ)$/$\mathcal{B}(B_c^+\,\to\,J/ψμ^+ν_μ)$

Abstract

A measurement is reported of the ratio of branching fractions $\mathcal{R}(J/ψ)=\mathcal{B}(B_c^+\,\to\,J/ψτ^+ν_τ)/\mathcal{B}(B_c^+\,\to\,J/ψμ^+ν_μ)$, where the $τ^+$ lepton is identified in the decay mode $τ^+\,\to\,μ^+ν_μ\overlineν_τ$. This analysis uses a sample of proton-proton collision data corresponding to 3.0$\mathrm{\,fb}^{-1}$ of integrated luminosity recorded with the LHCb experiment at center-of-mass energies $7\,\mathrm{TeV}$ and $8\,\mathrm{TeV}$. A signal is found for the decay $B_c^+\,\to\,J/ψτ^+ν_τ$ at a significance of 3 standard deviations, corrected for systematic uncertainty, and the ratio of the branching fractions is measured to be $\mathcal{R}(J/ψ) = 0.71 \pm 0.17 \mathrm{\,(stat)} \pm 0.18\mathrm{\,(syst)}$. This result lies within 2 standard deviations above the range of existing predictions in the Standard Model.

All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2017-035.html