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"Quaglian"
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Search for the lepton flavour violating decay B+ → K+μ−τ+ using$$ {B}_{s2}^{\\ast 0} $$decays
A search is presented for the lepton flavour violating decay B + → K + μ − τ + using a sample of proton-proton collisions at centre-of-mass energies of 7, 8, and 13 TeV, collected with the LHCb detector and corresponding to a total integrated luminosity of 9 fb − 1 . The τ leptons are selected inclusively, primarily via decays with a single charged particle. The four-momentum of the τ lepton is determined by using B + mesons from$$ {B}_{s2}^{\\ast 0}\\to {B}^{+}{K}^{-} $$B s 2 ∗ 0 → B + K − decays. No significant excess is observed, and an upper limit is set on the branching fraction ℬ( B + → K + μ − τ + ) < 3.9 × 10 −5 at 90 % confidence level. The obtained limit is comparable to the world-best limit.
Journal Article
