Zhangqier Wang 

Measurements of B(s)-> μ+μ- decays properties in proton-proton collisions at 13 TeV 

ABSTRACT:

Rare B meson decays proceeding via flavour-changing neutral currents allow precision tests of the Standard Model and provide a sensitive probe for potential beyond-the-Standard-Model contributions. I will present new measurements of the Bs → μ+μ− branching fraction and effective lifetime, as well as results of a search for the B0 → μ+μ− decay. The analysis is based on pp collision data collected by the CMS experiment at sqrt(s)=13 TeV during the LHC Run 2, corresponding to an integrated luminosity of 140 fb−1. The measured branching fraction of the Bs-> μ+μ- decays and the effective Bs lifetime are the most precise to date. No evidence for the B0-> μμ decay has been found. All results are found to be consistent with the standard model predictions.