The role of spurions in Higgs-less electroweak effective theories

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dc.creatorHirn, Johannes
dc.creatorStern, Jan
dc.date2004-01-07
dc.date2004-03-24
dc.date.accessioned2026-07-07T10:48:58Z
dc.date.available2026-07-07T10:48:58Z
dc.descriptionInspired by recent developments of moose models we reconsider low-energy effective theories of Goldstone bosons, gauge fields and chiral fermions applied to low-energy QCD and to Higgs-less electroweak symmetry breaking. Couplings and the corresponding reduction of symmetry are introduced via constraints enforced by a set of non-propagating covariantly constant spurion fields. Relics of the latter are used as small expansion parameters conjointly with the usual low-energy expansion. Certain couplings can only appear at higher orders of the spurion expansion and consequently, they become naturally suppressed independently of the idea of dimensional deconstruction. At leading order this leads to a set of generalized Weinberg sum rules and to the suppression of non-standard couplings to fermions in Higgs-less EWSB models with the minimal particle content. Within the latter, higher spurion terms allow for a fermion mass matrix with the standard CKM structure and CP violation. In addition, Majorana masses for neutrinos are possible. Examples of non-minimal models are briefly mentioned.
dc.descriptionSome precisions added to section 3.4. Reference [13] added. To appear in EPJC
dc.identifierhttps://arxiv.org/abs/hep-ph/0401032
dc.identifierhttp://arxiv.org/abs/hep-ph/0401032
dc.identifierEur.Phys.J.C34:447-475,2004
dc.identifierdoi:10.1140/epjc/s2004-01731-7
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/184065
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Theory
dc.titleThe role of spurions in Higgs-less electroweak effective theories
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