Tracks of resonances in electroweak effective Lagrangians

TL;DR

This paper investigates how integrating out heavy resonances in electroweak effective theories reveals patterns of low-energy constants, aiding the search for new physics beyond the Standard Model.

Contribution

It introduces a framework for analyzing the impact of heavy resonances on electroweak effective Lagrangians with a non-linear symmetry realization.

Findings

Patterns of low-energy constants identified

Heavy resonances influence electroweak corrections

Framework applicable to strongly-coupled UV completions

Abstract

Taking into account the negative searches for New Physics at the LHC, electroweak effective theories are appropriate to deal with current energies. Tracks of new, higher scales can be studied through next-to leading order corrections of the electroweak effective theory. We assume a generic non-linear realization of the electroweak symmetry breaking with a singlet Higgs and a strongly-coupled UV-completion. We further consider a high-energy Lagrangian that incorporates explicitly a general set of new heavy fields. After integrating out these heavy resonances, we study the pattern of low-energy constants among the light fields, which are generated by the massive states.