Search for the lepton-flavour violating decays B (s)0 → e ± μ

The LHCb collaboration

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A search for the lepton-flavour violating decays Bs0 → e±μ and B0 → e±μ 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 fraction of the Bs0 → e±μ decays are evaluated both in the hypotheses of an amplitude completely dominated by the heavy eigenstate and by the light eigenstate. The results are @@ℬ(Bs0→e)<6.3(5.4)×10−9 and @@ℬ(Bs0→e)<7.2(6.0)×10−9 at 95% (90%) confidence level, respectively. The upper limit on the branching fraction of the B0 → e±μ decay is also evaluated, obtaining @@ℬ(B0→e)<1.3(1.0)×10−9 at 95% (90%) confidence level. These are the strongest limits on these decays to date.[Figure not available: see fulltext.].

Original languageEnglish
Article number78
JournalJournal of High Energy Physics
Issue number3
Publication statusPublished - 1 Mar 2018


  • B physics
  • Branching fraction
  • Flavor physics
  • Hadron-Hadron scattering (experiments)
  • Rare decay


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