Strong Electroweak Symmetry Breaking: Generating Masses Dynamically

Abstract

One viable model of electroweak symmetry breaking through strong dynamics is topcolor-assisted technicolor (TC2). The underlying basic model, the Nambu--Jona-Lasinio (NJL) model, is studied and compared to the Standard Model. Custodial symmetry is shown to hold in the Standard Model and is explored in the NJL model. Several variants of technicolor and topcolor based on the NJL model are briefly discussed, before the phenomenology of TC2 is investigated. Quantitative results of the effect of TC2 on the asymmetry of top, which has been measured at the Tevatron in 2011, are given as a function of the mass of several new composite particles that appear in the TC2 effective theory.