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The role of spurions in Higgs-less electroweak effective theories
High Energy Physics - Phenomenology · Submitted 7 Jan 2004
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim 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.
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The abstract, sentence by sentence
Inspired 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.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | Inspired 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. | background 0.59 | 0.70 | 0.04 | asserted 0.85 |
| s1 | Couplings and the corresponding reduction of symmetry are introduced via constraints enforced by a set of non-propagating covariantly constant spurion fields. | method 0.94 | 0.69 | 0.07 | asserted 0.99 |
| s2 | Relics of the latter are used as small expansion parameters conjointly with the usual low-energy expansion. | method 0.96 | 0.50 | 0.05 | asserted 1.00 |
| s3 | 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. | result 0.71 | 0.70 | 0.25 | asserted 0.83 |
| s4 | 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. | result 1.00 | 0.81 | 0.48 | asserted 0.99 |
| s5 | Within the latter, higher spurion terms allow for a fermion mass matrix with the standard CKM structure and CP violation. | result 0.96 | 0.68 | 0.11 | asserted 0.69 |
| s6 | In addition, Majorana masses for neutrinos are possible. | result 0.96 | 0.63 | 0.05 | hedged possibility 0.90 |
| s7 | Examples of non-minimal models are briefly mentioned. | contribution 0.53 | 0.52 | 0.02 | asserted 0.71 |
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Original abstract
Inspired 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.
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References
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11 arXiv papers cite this in 25 sentences
Papers citing it · 23 sentences without a confident label
Cites it as background 2 papers
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No new material is involved in this Section that would not be already contained in Refs. [ref] (see also Ref. [ref] ).
Tests of non-standard electroweak couplings of right-handed quarks · Minimal not quite decoupling EW effective theory · 0.98
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We will refer to the models with replicated gauge symmetries as moose models [ref] .
Holographic approach to a minimal Higgsless model · Introduction · 0.91
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