Anomalous CP-Violation in B_s-Bbar_s Mixing Due to a Light Spin-One Particle

TL;DR

This paper explores how a light spin-1 particle could explain the anomalous CP-violation observed in B_s-Bbar_s mixing, aligning theoretical predictions with experimental data.

Contribution

It proposes a new physics scenario involving a light spin-1 particle to account for the D0 dimuon charge asymmetry anomaly.

Findings

A light spin-1 particle can produce effects consistent with the D0 measurement.

Experimental constraints limit the mass and coupling of the proposed particle.

The model offers a potential explanation for observed CP-violation anomalies.

Abstract

The recent measurement of the like-sign dimuon charge asymmetry in semileptonic b-hadron decays by the D0 Collaboration is about 3 sigmas away from the standard-model prediction, hinting at the presence of CP-violating new physics in the mixing of B_s mesons. We consider the possibility that this anomalous result arises from the contribution of a light spin-1 particle. Taking into account various experimental constraints, we find that the effect of such a particle with mass below the b-quark mass can yield a prediction consistent with the anomalous D0 measurement within its one-sigma range.