First observation of the decay $B^{+} \rightarrow \pi^{+} \mu^{+} \mu^{-}$ - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles Journal of High Energy Physics Year : 2012

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

R. Aaij
  • Function : Author
J. He
J. Cogan
O. Leroy
J. Serrano


A discovery of the rare decay $B^{+} \rightarrow \pi^{+} \mu^{+} \mu^{-}$ 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 $B^{+} \rightarrow \pi^{+} \mu^{+} \mu^{-}$ and $B^{+} \rightarrow \K^{+} \mu^{+} \mu^{-}$ branching fractions is measured to be 0.053 $\pm$ 0.014 (stat.) $\pm$ 0.001 (syst.).

Dates and versions

in2p3-00741291 , version 1 (12-10-2012)



R. Aaij, S. Barsuk, O. Callot, J. He, B. Jean-Marie, et al.. First observation of the decay $B^{+} \rightarrow \pi^{+} \mu^{+} \mu^{-}$. Journal of High Energy Physics, 2012, 12, pp.125. ⟨10.1007/JHEP12(2012)125⟩. ⟨in2p3-00741291⟩
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