First observation of the decay $B^{+}\to {\pi }^{+}{\mu }^{+}{\mu }^{-}$

Abstract

A discovery of the rare decay $B^{+}\to {\pi }^{+}{\mu }^{+}{\mu }^{-}$ is presented. This decay is observed for the first time, with 5.2 $\sigma$ significance. The observation is made using $pp$ collision data, corresponding to an integrated luminosity of 1.0 fb${}^{-1}$, collected with the LHCb detector. The measured branching fraction is (2.3 $\pm$ 0.6 (stat.) $\pm$ 0.1 (syst.))$\times 10^{-8}$, and the ratio of the $B^{+}\to {\pi }^{+}{\mu }^{+}{\mu }^{-}$ and $B^{+} \rightarrow \K^{+} μ^{+} μ^{-}$ branching fractions is measured to be 0.053 $\pm$ 0.014 (stat.) $\pm$ 0.001 (syst.).

20 pages (including authorlist), 8 figures. Version published in JHEP

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