Search for the Lepton Flavour Violating Decay B+ → K+μ−τ+ using B∗0s2 Decays

Journal of High Energy Physics 2020
Kārlis Dreimanis, Collaboration LHCb

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∗0s2→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.

Keywords
B physics Beyond Standard Model Flavor physics Hadron-Hadron scattering (experiments) Rare decay
DOI
10.1007/jhep06(2020)129
Hyperlink
https://link.springer.com/article/10.1007%2FJHEP06%282020%29129

The LHCb Collaboration, Aaij, R., Abellán Beteta, C., Dreimanis, K. ... [et al.] Search for the Lepton Flavour Violating Decay B+ → K+μ−τ+ using B∗0s2 Decays. Journal of High Energy Physics, 2020, Vol. 2020, No. 6, Article number 129. ISSN 1029-8479. Available from: doi:10.1007/jhep06(2020)129

Publication language
English (en)