Differential distributions in rare four-leptonic B-decays.

Anna Danilina,Nikolay Nikitin,V.E Volkova,Y.V Zhezher,D.G Levkov,V.A Rubakov,V.A Matveev

doi:10.1051/epjconf/201819102011

Abstract

The branching ratios and differential distributions for the fourleptonic decays B- → μ+μ- νe e-, B- → e+e- νμ μ- and B- → μ+ νμ μ-μ- are calculated within the Standard Model. The contributions of the virtual photon emission from the b- and u- quarks and the bremsstrahlung contribution were taken into account. The resonances contributions were calculated using the vector dominance model. In this paper we present the differential distributions for the B- → μ+μ- νe e- decay obtained by two methods. Testing the lepton universality in rare multileptonic decays of charged and neutral B mesons are discussed.

Highlights

Investigation of four-leptonic decays of B– mesons open the possibility for precision tests of Standard Model predictions in higher orders of perturbation theory
We presented predictions the branching ratios and the differential distributions for the decays B− → μ+μ−e−νe and B− → μ+μ−μ−νμ
We took into account the processes of the photon emission from u– and b–quarks of the B– meson and the bremsstrahlung

Summary

Introduction

Investigation of four-leptonic decays of B– mesons open the possibility for precision tests of Standard Model predictions in higher orders of perturbation theory. Decays of this type could be background processes for the extremely rare helicity suppressed Bd, s → μ+μ− decays, that have been the subject of vigorous studies at the Large Hadron Collider (LHC,CERN) [1,2,3] in connection with searches for physics beyond the Standard Model. In one of them the EvtGen Monte Carlo generator [6] based on the BTOMUMUENU model is used This model can be used directly at the LHC and other simulation procedure.

Effective Hamltonian

Theoretical prediction

EvtGen model for rare four-leptonic B-decays

Distributions for the Forward-Backward Asymmetry

Conclusion