The role of the top quark in theories of dynamical electroweak symmetry breaking

Mannan, Samjid Hassan (1991) The role of the top quark in theories of dynamical electroweak symmetry breaking. University of Southampton, Doctoral Thesis.

Abstract

We study various models which attempt to break electroweak symmetry dynamically and simultaneously give a realistic fermion spectrum. A truncation of the Schwinger-Dyson equations of the field theory called the ladder Gap Equation is used as our basic calculational tool. Throughout we concentrate on whether these models can predict a top quark in the range expected from the limits on 6p. We find a top quark mass larger than lOOGeV can be obtained in these models but that none of the models considered is completely satisfactory from a theoretical viewpoint.

We first consider the top mode standard model in which the top quark plays a central role in breaking electroweak symmetry. We study the prediction of the model for the mass of the top quark as well as a fine tuning problem associated with the model. We proceed to consider an extension of the model in which higher dimensional operators are included.

Next we consider a technicolour model where the interactions of tech-nifermions and top quarks are both important for breaking electroweak

symmetries and providing the correct fermion spectrum. Finally we consider an extended technicolor model and study in detail the mass spectrum of fermion and tcchnifcrmions that arises.

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