Test of lepton flavor universality in semileptonic B${}_{\text{c}}^{+}$ meson decays in proton-proton collisions at $\sqrt{s}$ = 13 TeV

CMS Collaboration

A measurement of the ratio of branching fractions $R$(J/$\ddot{I}ˆ$) = $\mathcal{B}$(B${}_{\text{c}}^{+}$ $\to$ J/$\ddot{I}ˆ$$\ddot{I}{„}^{+}\hat{I}{½}_{\ddot{I}}„$) / $\mathcal{B}$(B${}_{\text{c}}^{+}$ $\to$ J/$\ddot{I}ˆ$$\hat{I}{¼}^{+}\hat{I}{½}_{\hat{I}}¼$) in the…