Angular analysis of the decay B0 to K*0 mu mu from pp collisions at sqrt(s) = 8 TeV

TL;DR

This paper presents a detailed angular analysis of the decay B0 to K*0 mu mu using CMS data at 8 TeV, measuring key observables with high precision and confirming Standard Model predictions.

Contribution

It provides the most precise measurements to date of angular observables in B0 to K*0 mu mu decay at 8 TeV, enhancing understanding of flavor physics.

Findings

Measurements agree with Standard Model predictions

Determined forward-backward asymmetry of muons

Measured K*0 polarization fraction

Abstract

The angular distributions and the differential branching fraction of the decay B0 to K*0(892) mu mu are studied using data corresponding to an integrated luminosity of 20.5 inverse femtobarns collected with the CMS detector at the LHC in pp collisions at sqrt(s) = 8 TeV. From 1430 signal decays, the forward-backward asymmetry of the muons, the K*0(892) longitudinal polarization fraction, and the differential branching fraction are determined as a function of the dimuon invariant mass squared. The measurements are among the most precise to date and are in good agreement with standard model predictions.