LHCb results on rare leptonic decays of B-mesons

HSE University, Pokrovskii Bulvar 11, 109028

^* e-mail: evgenii.kurbatov@cern.ch

Published online: 19 November 2019

Abstract

A search for the rare leptonic decays was performed, using the proton-proton collision data collected with the LHCb experiment at center-ofmass energies of 8TeV and 13TeV. The following analysis are reviewed in this work:

• Measurements of the B⁰_s → µ⁺µ⁻ branching fraction and effective lifetime and search for B⁰ → µ⁺µ⁻ decays

• Search for the decays B⁰_s → τ⁺τ⁻ and B⁰ → τ⁺τ⁻

• Search for the lepton-flavour violating decays B⁰_(s) → e^±µ^∓

• Search for the lepton-flavour-violating decays B⁰_s → τ^±µ^∓ and B⁰ → τ^±µ^∓

• Search for the rare decay B⁺ → µ⁺µ⁻µ⁺ν_µ

All results are consistent with the Standard Model. Nearly all results presented are either unique or the most accurate for the time.