Angular analysis of the B$^0$ $\to$ K$^*$(892)$^0\mu^+\mu^-$ decay in proton-proton collisions at $\sqrt{s}$ = 13 TeV

TL;DR

This paper presents a detailed angular analysis of the decay B0 to K*0 mu+ mu- in proton-proton collisions at 13 TeV, providing precise measurements that test the Standard Model and reveal some tensions.

Contribution

First measurement of a comprehensive set of angular observables for B0 to K*0 mu+ mu- decay at 13 TeV with high precision.

Findings

Some predictions based on the Standard Model show tension with measurements.

Results are among the most precise for this decay mode.

Analysis covers six q^2 bins from 1.1 to 16 GeV^2.

Abstract

A full set of optimized observables is measured in an angular analysis of the decay B$^0$ $\to$ K$^*$(892)$^0\mu^+\mu^-$ using a sample of proton-proton collisions at $\sqrt{s}$ = 13 TeV, collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 140 fb$^{-1}$. The analysis is performed in six bins of the squared invariant mass of the dimuon system, $q^2$, over the range 1.1 $\lt$ $q^2$ $\lt$ 16 GeV$^2$. The results are among the most precise experimental measurements of the angular observables for this decay and are compared to a variety of predictions based on the standard model. Some of these predictions exhibit tension with the measurements.