Possible explanation of Zbb vertex anomaly in one-family technicolor models
N. Kitazawa, T. Yanagida
Abstract
In technicolor theories a large radiative correction to the Zbb vertex generally emerges, because of the large top quark mass and SU(2)L gauge symmetry. The correction can give us an explanation for the deviation of the experimental value of Rb from the standard model prediction. However, generally the T parameter becomes unacceptably large. We show that in the one-family technicolor model recently proposed by the authors all the S, T, and U parameters can be consistent with the experimental bounds while the observed anomaly of Rb is naturally explained.
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