Bs,d→μ+μ− in technicolor model with scalars

Rare decays Bs,d→μ+μ− are evaluated in technicolor model with scalars. Rb is revisited to constrain the model parameter space. It is found that restriction on f/f′ arising from Rb which was not considered in previous studies requires f/f′ no larger than 1.9 at 95% confidence level, implying no significantly enhancement for Br(Bs,d→μ+μ−) from neutral scalars in the model. However, the branching ratio of Bs→μ+μ− can still be enhanced by a factor of 5 relative to the standard model prediction. With the value of f/f′≲1.9, an upgraded Tevatron with an integrated luminosity 20 fb−1 will be sensitive to enhancement of Bs→μ+μ− in this model provided that neutral scalar mass mσ is below 580 GeV.