Electroweak effective theory and beyond Standard Model resonances

TL;DR

This paper develops a low-energy effective theory for electroweak symmetry breaking, incorporating potential heavy resonances, and derives relations between resonance properties and low-energy couplings, comparing predictions with experimental data.

Contribution

It introduces a non-linear realization of electroweak symmetry breaking including heavy resonances and derives mass-coupling relations using high-energy constraints.

Findings

Relations between resonance masses and low-energy couplings derived

Predictions consistent with experimental data

Bounds on resonance masses inferred

Abstract

We consider a non-linear realization of the electroweak symmetry-breaking pattern $SU(2)_L\times SU(2)_R/SU(2)_{L+R}$ to construct a low-energy effective theory, later extended by the inclusion of heavy new-physics resonances. After assuming appropriate high-energy constraints given by Weinberg sum-rules and the asymptotic behaviour of form-factors, we obtain relations between resonance masses and some low-energy effective couplings. These predictions are compared with current experimental data and some resonance mass bounds are inferred.