Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-05-25
Phys.Lett.B696:487-494,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
pages 1+18, 8 figures, figures added, discussions extended and references added and updated, version to be published in Physic
Scientific paper
10.1016/j.physletb.2011.01.010
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.
Chen Chuan-Hung
Faisel Gaber
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