$$Z \to b\bar b$$ probability and asymmetry in a model of dynamical electroweak symmetry breaking
Boris Andreevich Arbuzov, M. Yu. Osipov · Journal of Experimental and Theoretical Physics Letters · 1997
The deviations from the Standard Model in the probability of $$Z \to b\bar b$$ decay and in the forward-backward asymmetry in the reaction $$e^ + e^ - \to b\bar b$$ are studied in the framework of the model of dynamical electroweak symmetry breaking, the essential feature of which is the existence of a triple anomalous W-boson vertex in a region of momenta restricted by a cutoff Λ. We obtain a set of equations for additional terms in the $$Wb \bar t$$ vertex and apply its solution to the process $$Z \to b\bar b$$ . We show that it is possible to obtain a consistent description of both deviations, which is quite nontrivial because these effects are not simply correlated. The necessary value of the anomalous W interaction coupling, λ=−0.22±0.01, is consistent with existing bounds and leads to definite predictions, e.g., for pair W production in e + e − collisions at LEP200.