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

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

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