6533b83afe1ef96bd12a6f35

RESEARCH PRODUCT

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

Ignasi RosellJuan José Sanz-cilleroAntonio Pich

subject

PhysicsParticle physicsNuclear and High Energy PhysicsHiggs PhysicsElectroweak interactionScalar (mathematics)High Energy Physics::PhenomenologyOrder (ring theory)Oblique caseFOS: Physical sciencesTechnicolor and Composite ModelsResonance (particle physics)Standard ModelHigh Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)Beyond Standard ModelHiggs bosonChiral symmetry breakingChiral lagrangians

description

Using 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.

yearjournalcountryeditionlanguage
2014-01-28
https://dx.doi.org/10.48550/arxiv.1310.3121