$B \to K^* \ell^+ \ell^-$ as a probe of Universal Extra Dimensions

TL;DR

This paper investigates how the rare decay process $B o K^* \, \ell^+ \ell^-$ can serve as a sensitive probe for detecting effects of Universal Extra Dimensions, analyzing various observables and their dependence on the extra dimension's size.

Contribution

It provides a detailed analysis of $B o K^* \, \ell^+ \ell^-$ decay observables within the Standard Model and a Universal Extra Dimension model, highlighting potential signatures of new physics.

Findings

Branching ratio and asymmetries depend on the extra dimension radius R.

Potential deviations from Standard Model predictions are identified.

Tau polarization asymmetries offer additional probes for extra dimensions.

Abstract

We study some rare B decays induced by $b \to s$ transition within the Standard Model and in the Appelquist-Cheng-Dobrescu model, which is a New Physics scenario with a single universal extra dimension. In particular, we discuss the dependence on the radius $R$ of the compactified extra-dimension of the branching ratio, the forward-backward asymmetry and the $K^*$ helicity distributions for the decay modes $B \to K^* \ell^+ \ell^-$, with $\ell^-=e^-,\mu^-$, and the tau polarization asymmetries for the mode $B \to K^* \tau^+ \tau^-$.