Axigluon on like-sign charge asymmetry ${\cal A}^b_{s\ell}$, FCNCs and CP asymmetries in B decays

TL;DR

This paper investigates how a non-universal axigluon in chiral color models can significantly affect B meson mixing, CP asymmetries, and like-sign dimuon charge asymmetry, providing potential explanations for observed anomalies.

Contribution

It introduces a new axigluon model that explains enhancements in B meson CP asymmetries and like-sign dimuon charge asymmetry beyond Standard Model predictions.

Findings

Axigluon contributions can enhance ${ m A}^{b}_{s ext{l}}$ by an order of magnitude.

Constraints from $ riangle m_{B_q}$ and $ ext{sin}2eta$ measurements restrict axigluon parameters.

Large CP asymmetries $ ext{sin}2eta^{J/ ext{ extpi}} ext{ extphi}_s$ and differences in $ ext{sin}2eta$ are achievable.

Abstract

A non-universal axigluon in generalized chiral color models leads to flavor changing neutral currents (FCNCs) at tree level. We analyze phenomenologically the new contributions to $B_{q}$ (q=d, s) mixing and the related CP asymmetries (CPAs) that are generated by axigluon exchange. We find that although $\Delta m_{B_q}$ can give a strict constraint on the parameters of $b\to q$ transition, the precise measurement of $\sin2\beta_{J/\Psi K^0}$ can further exclude the parameter space of $b\to d$ transition. The axigluon-mediated effects can enhance the like-sign dimuon charge asymmetry ${\cal A}^{b}_{s\ell}$ by one order of magnitude larger than the standard model prediction. Accordingly, large CPA $\sin2\beta^{J/\Psi \phi}_s$ and CPA difference $\sin2\beta_{J\Psi K^0}-\sin2\beta_{\phi K^0}$ are achieved.