Abstract
A discovery of the rare decay \$B^+ \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.))\$10^-8\$, and the ratio of the \$B^+ \pi^+
\mu^+ \mu^-\$ and \$B^+ \K^+ \mu^+ \mu^-\$ branching
fractions is measured to be 0.053 \$\pm\$ 0.014 (stat.) \$\pm\$ 0.001 (syst.).
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