Search for the lepton flavour violating decay B + → K + μ − τ + using B s 2 ∗ 0 decays

Journal article

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 Bs2∗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.

Authors: Aaij, R; Abellán Beteta, C; Ackernley, T; Adeva, B; Adinolfi, M

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: Springer
• Journal: Journal of High Energy Physics
• Volume: 2020
• Issue: 6
• Article number: 129
• Publication date: 2020-06-22
• Acceptance date: 2020-05-25
• DOI: 10.1007/jhep06(2020)129
• EISSN: 1029-8479
• ISSN: 1126-6708
• Language: English
• Keywords: B physics; Beyond Standard Model; Hadron-Hadron scattering (experiments); Flavor physics; Rare decay