Measurement of the $B^{+}/B^0$ production ratio in $e^{+}{e}^{-}$ collisions at the ${\rm Y}(4S)$ resonance using $B\to J/\psi (\ell \ell )K$ decays at Belle

Belle Collaboration, S. Choudhury, S. Sandilya +197

We measure the ratio of branching fractions for the ${\rm Y}(4S)$ decays to $B^{+}{B}^{-}$ and $B^0\bar{B}{}^0$ using $B^{+}\to J/\psi (\ell \ell )K^{+}$ and $B^0 \rightarrow J/ψ(\ell\ell) K^0…