Abstract : 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.).
Document type :
Journal articles
Journal of High Energy Physics, Institute of Physics (IOP), 2012, 12, pp.125. <10.1007/JHEP12(2012)125>
http://hal.in2p3.fr/in2p3-00741291
Contributor : Françoise Marechal <>
Submitted on : Friday, October 12, 2012 - 11:46:34 AM
Last modification on : Monday, January 7, 2013 - 2:56:10 PM
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, Institute of Physics (IOP), 2012, 12, pp.125. <10.1007/JHEP12(2012)125>. <in2p3-00741291>
