Flavor changing Z decay Z→bs̄(b̄s) in topcolor-assisted technicolor models Original Research Article

In the context of topcolor-assisted technicolor (TC2) models, we examine the flavor changing (FC) Z decay Z→bs̄(b̄s) and calculate the contributions of the new particles predicted by TC2 models to the branching ratio Br(Z→bs̄+b̄s). We find that the contributions mainly come from the top-pions. In most of the parameter space, the Br(Z→bs̄+b̄s) can reach 10−5, which may be detected in near future experiments such as Giga-Z version of the TESLA. Thus, the FC Z decay Z→bs̄(b̄s) can be used to test TC2 models.