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

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 $\sin 2{\beta }_{J/\Psi K^0}$ can further exclude the parameter space of $b\to d$ transition. The axigluon-mediated effects can enhance the like-sign dimuon charge asymmetry ${\mathcal{A}}_{s\ell }^b$ by one order of magnitude larger than the standard model prediction. Accordingly, large CPA $\sin 2{\beta }_s^{J/\Psi \varphi }$ and CPA difference $\sin 2{\beta }_{J\Psi K^0}-\sin 2{\beta }_{\varphi K^0}$ are achieved.

Comments: pages 1+18, 8 figures, figures added, discussions extended and references added and updated, version to be published in Physics Letters B