Search for the lepton-flavour violating decays $B_{(s)}^0\to e^{\pm }{\mu }^{\mp }$

Abstract

A search for the lepton-flavour violating decays $B_s^0\to e^{\pm }{\mu }^{\mp }$ and $B^0\to e^{\pm }{\mu }^{\mp }$ is performed based on a sample of proton-proton collision data corresponding to an integrated luminosity of 3 fb${}^{-1}$, collected with the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. The observed yields are consistent with the background-only hypothesis. Upper limits on the branching fractions are determined to be $\mathcal{B}(B_s^0\to e^{\pm }{\mu }^{\mp })<5.4(6.3)\times 10^{-9}$ and $\mathcal{B}(B^0\to e^{\pm }{\mu }^{\mp })<1.0(1.3)\times 10^{-9}$ at $90\%(95\%)$ confidence level, which are the strongest limits on these decays to date.

arXiv commentAll figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2017-031.html

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