Multigauge-boson vertices and chiral Lagrangian parameters in Higgsless models with ideal fermion delocalization

Journal Article · Sat Oct 01 00:00:00 EDT 2005 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.72.075012· OSTI ID:20713674

Chivukula, R Sekhar; Simmons, Elizabeth H; He, H -J; Kurachi, Masafumi; Tanabashi, Masaharu ^[1]

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1. Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824 (United States)

Higgsless models with fermions whose SU(2) properties are ''ideally delocalized,'' such that the fermion's probability distribution is appropriately related to the W boson wave function, have been shown to minimize deviations in precision electroweak parameters. As contributions to the S parameter vanish to leading order, current constraints on these models arise from limits on deviations in multi-gauge-boson vertices. We compute the form of the triple and quartic gauge-boson vertices in these models and show that these constraints provide lower bounds only of the order of a few hundred GeV on the masses of the lightest KK resonances. Higgsless models with ideal fermion delocalization provide an example of extended electroweak gauge interactions with suppressed couplings of fermions to extra gauge bosons, and these are the only models for which triple-gauge-vertex measurements provide meaningful constraints. We relate the multigauge couplings to parameters of the electroweak chiral Lagrangian, and the parameters obtained in these SU(2)xSU(2) models apply equally to the corresponding five-dimensional gauge theory models of QCD. We also discuss the collider phenomenology of the KK resonances in models with ideal delocalization. These resonances are found to be fermiophobic, therefore traditional direct collider searches are not sensitive to them and measurements of gauge-boson scattering will be needed to find them.

• OSTI ID: 20713674
• Journal Information: Physical Review. D, Particles Fields, Vol. 72, Issue 7; Other Information: DOI: 10.1103/PhysRevD.72.075012; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CHIRAL SYMMETRY
CHIRALITY
DISTRIBUTION
FERMIONS
GAUGE INVARIANCE
GEV RANGE
KALUZA-KLEIN THEORY
LAGRANGIAN FIELD THEORY
LAGRANGIAN FUNCTION
PROBABILITY
QUANTUM CHROMODYNAMICS
RESONANCE PARTICLES
REST MASS
SCATTERING
SU-2 GROUPS
W MINUS BOSONS
W PLUS BOSONS
WAVE FUNCTIONS