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An Effective Higgsless Theory: Satisfying Electroweak Constraints and a Heavy Top Quark
High Energy Physics - Phenomenology · Submitted 8 Sep 2005
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We also show that it is possible to obtain the top quark mass, without affecting the delay of unitarity violation of the $W^+ W^-\to W^+W^-$ scattering amplitude, by separating the mass scales of the fermion sector ($1/R_f$) from that of the gauge sector ($1/R_g$).
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The abstract, sentence by sentence
The main challenge faced by Higgsless models of electroweak symmetry breaking is to reconcile the experimental constraints imposed by the precision electroweak data and the top quark phenomenology with the unitarity constraints imposed by longitudinal gauge boson scattering amplitudes. In this paper we expand on previous work, giving details of how delocalized fermions can be used to adjust the $S$ parameter to zero, while keeping the $T$ and $U$ parameters naturally suppressed. We also show that it is possible to obtain the top quark mass, without affecting the delay of unitarity violation of the $W^+ W^-\to W^+W^-$ scattering amplitude, by separating the mass scales of the fermion sector ($1/R_f$) from that of the gauge sector ($1/R_g$). The fermion sector scale $1/R_f$ is only weakly constrained by unitarity of the $t\bar{t}\to W^+ W^-$ scattering amplitude; thus the ratio $R_g/R_f$ can be quite large, and the top mass can be easily achieved. Anomalous right-handed couplings involving the third generation quarks also avoid constraints from experimental data if $1/R_f$ is sufficiently large.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | The main challenge faced by Higgsless models of electroweak symmetry breaking is to reconcile the experimental constraints imposed by the precision electroweak data and the top quark phenomenology with the unitarity constraints imposed by longitudinal gauge boson scattering amplitudes. | background 0.99 | 0.05 | 0.04 | asserted 1.00 |
| s1 | In this paper we expand on previous work, giving details of how delocalized fermions can be used to adjust the $S$ parameter to zero, while keeping the $T$ and $U$ parameters naturally suppressed. | contribution 0.89 | 0.90 | 0.12 | asserted 0.99 |
| s2 | We also show that it is possible to obtain the top quark mass, without affecting the delay of unitarity violation of the $W^+ W^-\to W^+W^-$ scattering amplitude, by separating the mass scales of the fermion sector ($1/R_f$) from that of the gauge sector ($1/R_g$). | result 0.56 | 0.93 | 0.31 | asserted 0.50 |
| s3 | The fermion sector scale $1/R_f$ is only weakly constrained by unitarity of the $t\bar{t}\to W^+ W^-$ scattering amplitude; thus the ratio $R_g/R_f$ can be quite large, and the top mass can be easily achieved. | result 0.50 | 0.76 | 0.23 | asserted 0.93 |
| s4 | Anomalous right-handed couplings involving the third generation quarks also avoid constraints from experimental data if $1/R_f$ is sufficiently large. | result 0.98 | 0.63 | 0.09 | asserted 0.67 |
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The paper
Original abstract
The main challenge faced by Higgsless models of electroweak symmetry breaking is to reconcile the experimental constraints imposed by the precision electroweak data and the top quark phenomenology with the unitarity constraints imposed by longitudinal gauge boson scattering amplitudes. In this paper we expand on previous work, giving details of how delocalized fermions can be used to adjust the $S$ parameter to zero, while keeping the $T$ and $U$ parameters naturally suppressed. We also show that it is possible to obtain the top quark mass, without affecting the delay of unitarity violation of the $W^+ W^-\to W^+W^-$ scattering amplitude, by separating the mass scales of the fermion sector ($1/R_f$) from that of the gauge sector ($1/R_g$). The fermion sector scale $1/R_f$ is only weakly constrained by unitarity of the $t\bar{t}\to W^+ W^-$ scattering amplitude; thus the ratio $R_g/R_f$ can be quite large, and the top mass can be easily achieved. Anomalous right-handed couplings involving the third generation quarks also avoid constraints from experimental data if $1/R_f$ is sufficiently large.
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References
How the literature uses it
6 arXiv papers cite this in 12 sentences
Papers citing it · 9 sentences without a confident label
Cites it as support 1 paper
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As we demonstrate in the Appendix, this amount of delocalization insures the equality of the tree-level three-site model couplings to those of the standard model, up to corrections of order $x^4$ [ref] and the absence of large tree-level corrections to precision electroweak measurements [ref] .
The Flavor Structure of the Three-Site Higgsless Model · Gauge-Boson Couplings at Tree-Level · 0.96
Cites it as background 2 papers
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We review in this Section the continuum limit of the moose model of [ref] and the holographic approach for gauge fields proposed in [ref] .
Holographic approach to a minimal Higgsless model · Holographic analysis of the gauge sector · 0.89
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Higgsless models [ref] of electroweak symmetry breaking provide effective low-energy theories of a strongly-interacting symmetry breaking sector [ref] which, in the case of “delocalized" fermions [ref] , can be consistent with electroweak precision measurements [ref] .
Z to b bbar and Chiral Currents in Higgsless Models · Introduction · 0.98
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