Rare leptonic and semi-leptonic decays at LHCb

TL;DR

This paper reports on LHCb measurements of rare leptonic and semi-leptonic decays, including the observation of a rare decay mode and detailed analysis of contributions to another decay, providing tests of the Standard Model.

Contribution

It presents the first observation of the rare $J/\psi \to \mu^{+}\mu^{-}\mu^{+}\mu^{-}$ decay and a comprehensive analysis of contributions to $B^0 \to K^{*0}\mu^{+}\mu^{-}$ decay, advancing experimental tests of the Standard Model.

Findings

Observation of the rare $J/\psi \to \mu^{+}\mu^{-}\mu^{+}\mu^{-}$ decay

Detailed measurement of local and nonlocal contributions to $B^0 \to K^{*0}\mu^{+}\mu^{-}$ decay

Enhanced understanding of rare decay processes in particle physics

Abstract

Rare leptonic and semi-leptonic decays offer an excellent opportunity to test the Standard Model of Particle Physics. These proceedings report on two recent LHCb measurements. The first is an observation of the rare $J/\psi \to \mu^{+}\mu^{-}\mu^{+}\mu^{-}$ decay and the second is a comprehensive measurement of local and nonlocal contributions to the $B^0 \to K^{*0}\mu^{+}\mu^{-}$ decay.