Dynamical breakdown of Abelian gauge chiral symmetry by strong Yukawa interactions

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dc.creatorBenes, Petr
dc.creatorBrauner, Tomas
dc.creatorHosek, Jiri
dc.date2006-05-12
dc.date2007-03-21
dc.date.accessioned2026-07-07T11:05:04Z
dc.date.available2026-07-07T11:05:04Z
dc.descriptionWe consider a model with anomaly-free Abelian gauge axial-vector symmetry, which is intended to mimic the standard electroweak gauge chiral SU(2)_L x U(1)_Y theory. Within this model we demonstrate: (1) Strong Yukawa interactions between massless fermion fields and a massive scalar field carrying the axial charge generate dynamically the fermion and boson proper self-energies, which are ultraviolet-finite and chirally noninvariant. (2) Solutions of the underlying Schwinger-Dyson equations found numerically exhibit a huge amplification of the fermion mass ratios as a response to mild changes of the ratios of the Yukawa couplings. (3) The `would-be' Nambu-Goldstone boson is a composite of both the fermion and scalar fields, and it gives rise to the mass of the axial-vector gauge boson. (4) Spontaneous breakdown of the gauge symmetry further manifests by mass splitting of the complex scalar and by new symmetry-breaking vertices, generated at one loop. In particular, we work out in detail the cubic vertex of the Abelian gauge boson.
dc.description11 pages, REVTeX4, 10 eps figures; additional remarks and references added; version published in Phys. Rev. D
dc.identifierhttps://arxiv.org/abs/hep-ph/0605147
dc.identifierhttp://arxiv.org/abs/hep-ph/0605147
dc.identifierPhys.Rev.D75:056003,2007
dc.identifierdoi:10.1103/PhysRevD.75.056003
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/189099
dc.subjectHigh Energy Physics - Phenomenology
dc.titleDynamical breakdown of Abelian gauge chiral symmetry by strong Yukawa interactions
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