Author:
Bertuzzo Enrico,Ray Tirtha Sankar,de Sandes Hiroshi,Savoy Carlos A.
Abstract
Abstract
We investigate the issue of anomalous contribution to the T parameter and to Flavor Changing Neutral Currents in models with two Higgs doublets arising as composite pseudo Nambu-Goldstone modes. The non linear Lagrangians of several models are explicitly derived and the anomalous contributions to T are identified. The breaking patterns SU(5) → SU(4) × U(1) and SU(5) → SU(4), are analyzed first and we show how anomalous contributions to T arise in both models. Apart from that, the embedding of the Standard Model fermions in a 10 of SU(5) avoids at the same time large corrections to the
$ Zb\overline{b} $
coupling and Flavor Changing Neutral Current transitions. Finally, we propose a model based on the breaking SO(9)/SO(8) that is free from anomalous contributions to T and in which the problems of the
$ Zb\overline{b} $
coupling and of Flavor Changing Neutral Currents can be simultaneously solved.
Publisher
Springer Science and Business Media LLC
Subject
Nuclear and High Energy Physics
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