Large-N and vacuum alignment in top-color models

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Large-N and vacuum alignment in top-color models

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Title: Large-N and vacuum alignment in top-color models
Author: Chivukula, R. Sekhar; Georgi, Howard

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Citation: Chivukula, R. Sekhar, and Howard Georgi. 1998. “ Large-N and Vacuum Alignment in Top-Color Models .” Phys. Rev. D 58 (7) (September 1). doi:10.1103/physrevd.58.075004.
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Abstract: Topcolor and topcolor-assisted technicolor provide examples of dynamical electroweak symmetry breaking which include top-condensation, thereby naturally incorporating a heavy top quark. In this note we discuss the roles of the Nambu-Jona-Lasinio (NJL) and largeN approximations often used in phenomenological analyses of these models. We show that, in order to provide for top-condensation but not bottom-condensation, the top-color coupling must be adjusted to equal the critical value for chiral symmetry breaking up to O(1/N) in any theory in which the isospin-violating “tilting” interaction is a U(1) gauge interaction. A consequence of these considerations is that the potentially dangerous “bottom-pions” are naturally light. We also show that the contributions to ρ − 1 previously estimated are of leading-order in N, are not included in the usual NJL analysis, and are the result of “vacuum-alignment”.
Published Version: doi:10.1103/PhysRevD.58.075004
Other Sources: http://arxiv.org/abs/hep-ph/9805478
Terms of Use: This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#LAA
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:28265569
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