Rare B Decays at CMS

TL;DR

This paper analyzes angular distributions in rare B meson decays using CMS data at 8 TeV, testing for deviations from the Standard Model with results consistent with predictions.

Contribution

It provides the first detailed angular analysis of B0 to K*0 mu+ mu- decays at CMS, focusing on parameters related to potential new physics.

Findings

Measured angular parameters P1 and P5' as functions of dimuon mass squared.

Results are consistent with Standard Model predictions.

No significant deviation indicating new physics was observed.

Abstract

The flavour changing neutral current decays can be interesting probes for searching for New Physics. Angular distributions of the decay $\mathrm{B}^0 \to \mathrm{K}^{*0} \mu^ +\mu^-$ are studied using a sample of proton-proton collisions at $\sqrt{s} = 8~\mathrm{TeV}$ collected with the CMS detector at the LHC, corresponding to an integrated luminosity of $20.5~\mathrm{fb}^{-1}$. An angular analysis is performed to determine $P_1$ and $P_5'$, where $P_5'$ is of particular interest due to recent measurements that indicate a potential discrepancy with the standard model. Based on a sample of 1397 signal events, $P_1$ and $P_5'$ angular parameters are determined as a function of the dimuon invariant mass squared. The measurements are in agreement with standard model predictions.