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The angular distribution and differential branching fraction of the decay$B^{+} \rightarrow K^{+}\mu^{+}\mu^{-}$ are studied with a datasetcorresponding to $1.0\,\mathrm{fb}^{-1}$ of integrated luminosity, collected bythe LHCb experiment. The angular distribution is measured in bins of dimuoninvariant mass squared and found to be consistent with Standard Modelexpectations. Integrating the differential branching fraction over the fulldimuon invariant mass range yields a total branching fraction of$\mathcal{B}(B^{+} \rightarrow K^{+}\mu^{+}\mu^{-}) = (4.36 \pm 0.15 \pm0.18)\times 10^{-7}$. These measurements are the most precise to date of the$B^{+} \rightarrow K^{+}\mu^{+}\mu^{-}$ decay.

Differential branching fraction and angular analysis of the $B^{+} \rightarrow K^{+}\mu^{+}\mu^{-}$ decay