Oblique S and T Constraints on Electroweak Strongly-Coupled Models with a Light Higgs
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Oblique S and T Constraints on Electroweak Strongly-Coupled Models with a Light Higgs

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Oblique S and T Constraints on Electroweak Strongly-Coupled Models with a Light Higgs

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Pich Zardoya, Antonio Perfil; Rosell Escribà, Ignasi; Sanz Cillero, Juan José
This document is a artículoDate2014

Este documento está disponible también en : http://hdl.handle.net/10550/37987
Using a general effective Lagrangian implementing the chiral symmetry breaking SU(2)L x 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.

    Pich Zardoya, Antonio Rosell Escribà, Ignasi Sanz Cillero, Juan José 2014 Oblique S and T Constraints on Electroweak Strongly-Coupled Models with a Light Higgs Journal of High Energy Physics 2014 1 157
http://dx.doi.org/10.1007/JHEP01(2014)157

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