Constraints on Unparticles from $B_s\to\mu^+\mu^-$

TL;DR

This paper investigates how scalar unparticles could influence the decay $B_s o\mu^+\mu^-$, providing constraints on unparticle parameters based on current experimental data.

Contribution

It offers the first analysis of scalar unparticle effects on $B_s o\mu^+\mu^-$ decay, deriving allowed parameter regions consistent with measurements.

Findings

Allowed regions for scalar unparticle coupling constants and scaling dimension.

Unparticle contributions could still be compatible with current experimental results.

Vector unparticles are negligible in this decay process.

Abstract

Unparticle contributions to the recently measured decay mode $B_s\to\mu^+\mu^-$ are analyzed. We consider only the scalar unparticles because vector unparticles are expected to provide negligible contributions. Assuming that the relevant coupling constants are real, we present allowed regions of coupling constants and the scaling dimension of the scalar unparticle. While the measured value of the branching ratio is very close to the standard model predictions, one cannot exclude the possible contributions from unparticles.