Unparticle contributions to $\Bs$-$\Bsbar$ mixing

TL;DR

This paper revisits the impact of unparticle physics on $ ext{B}_s$-$ ext{B}_s$bar mixing, highlighting the suppressed role of vector unparticles and the significant effects of scalar unparticles on mixing phases.

Contribution

It demonstrates that scalar unparticles can significantly influence $ ext{B}_s$-$ ext{B}_s$bar mixing phases, while vector unparticle effects are highly suppressed due to unitarity constraints.

Findings

Scalar unparticles can produce large mixing phases.

Vector unparticle contributions are strongly suppressed.

The mixing phase from scalar unparticles is negative.

Abstract

The unparticle effects on the $\Bs$-$\Bsbar$ mixing is revisited. Taking into account the unitarity constraints on the unparticle operators, we find that the contribution of the vector unparticle is very suppressed compared to that of the scalar unparticle. This is due to the fact that the lower bound of the scaling dimension of the vector-unparticle operator is larger. It is also shown that the mixing phase from the scalar unparticle is negative, and unparticles can produce large mixing phase.