Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-05-27
Physics
High Energy Physics
High Energy Physics - Phenomenology
17 pages and 15 pdf figures. Discussion of custodial-triplet right-handed fermions added. Minor typos corrected
Scientific paper
In this paper we consider the effects of top quark compositeness on the electroweak parameters T-hat and S-hat and the Zbb coupling. We do so by using an effective field theory analysis to identify several promising patterns of mixing between standard model like and vector fermions, and then analyzing simple extensions of the Standard Model that realize those patterns. These models illustrate four ways in which an extended O(4) symmetry, which controls the size of radiative corrections to the observables discussed, may be broken. These models may also be viewed as highly-deconstructed versions of five-dimensional gauge theories dual to various strongly-interacting composite Higgs theories. We comment on how our results relate to extra-dimensional models previously considered, and we demonstrate that one pattern of O(4) breaking is phenomenologically favored.
Chivukula Sekhar R.
Foadi Roshan
Simmons Elizabeth H.
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