Differential decay rate of $B^{+}\to J/\ddot{I}ˆK^{+}$ with the LHCb Upgrade I experiment

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1183

The normalised decay rate of $B^{+}\to J/\ddot{I}ˆ(\to \hat{I}{¼}^{+}\hat{I}{¼}^{-})K^{+}$ is measured as a function of the lepton helicity angle using a data sample corresponding to an integrated luminosity o…