Study Majorana Neutrino Contribution to B-meson Semi-leptonic Rare Decays

Understand

B meson semi-leptonic rare decays are sensitive to new physics beyond standard model.

• We study the $B^{-}\to \pi^{-}\mu^{+}\mu^{-}$ process and investigate the Majorana neutrino contribution to its decay width.
• The constraints on the Majorana neutrino mass and mixing parameter are obtained from this decay channel with the latest LHCb data.
• Utilizing the best fit for the parameters, we study the lepton number violating decay $B^{-}\to \pi^{+}\mu^{-}\mu^{-}$, and find its branching ratio is about $6.4\times10^{-10}$, which is consistent with the LHCb data reported recently.