Rare decays and searches for exotic signatures at LHCb: purely leptonic decays

TL;DR

This paper reviews the experimental status of purely leptonic B meson decays at LHCb, presenting new precise measurements that align with the Standard Model but also support recent anomalies in b→sℓℓ transitions.

Contribution

It provides the most precise single-experiment measurements of B0_{[s]}→μ+μ− decays and discusses their implications for the Standard Model and recent anomalies.

Findings

Measurements are the most precise to date.

Results are consistent with the Standard Model.

Findings support recent anomalies in b→sℓℓ transitions.

Abstract

A review of the experimental status of purely leptonic ${B^0_{[s]}\to\ell^+\ell^-}$ decays is given and the new analysis of ${B^0_{[s]}\to\mu^+\mu^-}$ observables with the LHCb experiment is presented. The new results are the most precise single experiment measurements of the quantities to date and are consistent with the Standard Model. However, they also match the recent anomalies found in $b\to s\ell\ell$ transitions excellently.