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Oblique S and T constraints on electroweak strongly-coupled models with a light Higgs

AutorPich, Antonio ; Rosell, Ignasi ; Sanz-Cillero, Juan José
Palabras claveHiggs Physics
Beyond Standard Model
Chiral Lagrangians
Technicolor and Composite Models
Fecha de publicación28-ene-2014
CitaciónJournal of High Energy Physics 2014: 157 (2014)
ResumenUsing a general effective Lagrangian implementing the chiral symmetry breaking SU(2) L ⊗ SU(2) R → SU(2) L+R , we present a one-loop calculation of the oblique S and T parameters within electroweak strongly-coupled models with a light scalar. Imposing a proper ultraviolet behaviour, we determine S and T at next-to-leading order in terms of a few resonance parameters. The constraints from the global fit to electroweak precision data force the massive vector and axial-vector states to be heavy, with masses above the TeV scale, and suggest that the W + W − and ZZ couplings of the Higgs-like scalar should be close to the Standard Model value. Our findings are generic, since they only rely on soft requirements on the short-distance properties of the underlying strongly-coupled theory, which are widely satisfied in more specific scenarios.
Versión del editorhttp://dx.doi.org/10.1007/JHEP01(2014)157
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