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

TL;DR

This paper investigates how Majorana neutrinos could influence rare B-meson decays, constraining their properties and predicting a lepton number violating decay rate consistent with recent experimental data.

Contribution

It provides new constraints on Majorana neutrino parameters and predicts the branching ratio of a lepton number violating decay within experimental limits.

Findings

Constraints on Majorana neutrino mass and mixing from B decay data

Predicted branching ratio for lepton number violating decay

Consistency with recent LHCb measurements

Abstract

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.