# 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$_{s}^{0}$  → e$^{±}$μ$^{∓}$ and B$^{0}$ → 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 B$_{s}^{0}$  → 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 $\frac{@}{@}\mathrm{\mathcal{B}}\left({B}_s^0\to {e}^{\pm }{\mu}^{\mp}\right)<6.3(5.4)\times 1{0}^{-9}$ and $\frac{@}{@}\mathrm{\mathcal{B}}\left({B}_s^0\to {e}^{\pm }{\mu}^{\mp}\right)<7.2(6.0)\times 1{0}^{-9}$ at 95% (90%) confidence level, respectively. The upper limit on the branching fraction of the B$^{0}$ → e$^{±}$μ$^{∓}$ decay is also evaluated, obtaining $\frac{@}{@}\mathrm{\mathcal{B}}\left({B}^0\to {e}^{\pm }{\mu}^{\mp}\right)<1.3(1.0)\times 1{0}^{-9}$ at 95% (90%) confidence level. These are the strongest limits on these decays to date.
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Journal articles

https://hal.archives-ouvertes.fr/hal-01758630
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Submitted on : Wednesday, April 4, 2018 - 4:12:52 PM
Last modification on : Thursday, October 17, 2019 - 2:56:55 AM

### Citation

Roel Aaij, Bernardo Adeva, Marco Adinolfi, Ziad Ajaltouni, Simon Akar, et al.. Search for the lepton-flavour violating decays B$_{(s)}^{0} \to e^{\pm}\mu^{\mp}$. JHEP, 2018, 03, pp.078. ⟨10.1007/JHEP03(2018)078⟩. ⟨hal-01758630⟩

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