One-loop effects from spin-1 resonances in Composite Higgs models

A bstract We compute the 1-loop correction to the electroweak observables from spin-1 resonances in SO(5)/SO(4) composite Higgs models. The strong dynamics is modeled with an effective description comprising the Nambu-Goldstone bosons and the lowest-lying spin-1 resonances. A classification is perfo...

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Bibliographic Details
Published in:The journal of high energy physics 2015-07, Vol.2015 (7), p.1-35, Article 65
Main Authors: Contino, Roberto, Salvarezza, Matteo
Format: Article
Language:English
Subjects:
Bosons
Classical and Quantum Gravitation
Classification
Dynamics
Elementary Particles
Gaging
Gauging
High energy physics
Matching
Mathematical models
Operators
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Quantum Physics
Regular Article - Theoretical Physics
Relativity Theory
String Theory
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Summary:A bstract We compute the 1-loop correction to the electroweak observables from spin-1 resonances in SO(5)/SO(4) composite Higgs models. The strong dynamics is modeled with an effective description comprising the Nambu-Goldstone bosons and the lowest-lying spin-1 resonances. A classification is performed of the relevant operators including custodially-breaking effects from the gauging of hypercharge. The 1-loop contribution of the resonances is extracted in a diagrammatic approach by matching to the low-energy theory of Nambu-Goldstone bosons. We find that the correction is numerically important in a significant fraction of the parameter space and tends to weaken the bounds providing a negative shift to the S parameter.
ISSN:1029-8479
1029-8479
DOI:10.1007/JHEP07(2015)065