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Search for the lepton-flavour violating decays $B^+ \to K^+ μ^{\pm} e^{\mp}$ (1909.01010v2)

Published 3 Sep 2019 in hep-ex

Abstract: A search for the lepton-flavour violating decays $B+ \to K+ {\mu}{\pm} e{\mp}$ is performed using a sample of proton-proton collision data, collected with the LHCb experiment at centre-of-mass energies of $7$ and $8~{\rm TeV}$ and corresponding to an integrated luminosity of 3$\rm~fb{-1}$. No significant signal is observed, and upper limits on the branching fractions are set as $\mathcal{B}(B+ \to K+ {\mu}- e+) < 7.0~(9.5) \times 10{-9}$ and $\mathcal{B}(B+ \to K+ {\mu}+ e-) < 6.4~(8.8) \times 10{-9}$ at 90 (95) % confidence level. The results improve the current best limits on these decays by more than one order of magnitude.

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