No signal observed for B+ → π+ μ± e∓; branching fraction upper limit set at 1.8 × 10^{-9} at 90% CL.
Aaijet al.,Search for the lepton-flavour-violating decays B0 →K ∗0τ ±e∓, JHEP11(2025) 172
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Search for the lepton-flavour violating decays $B^+ \to \pi^+ \mu^\pm e^\mp$
No signal observed for B+ → π+ μ± e∓; branching fraction upper limit set at 1.8 × 10^{-9} at 90% CL.