Analysis of beyond the Standard Model resonances with effective approaches and oblique parameters

TL;DR

This paper investigates how effective field theories and oblique parameters can be used to detect and constrain new heavy resonances beyond the Standard Model, finding that such resonances must be heavier than 2 TeV.

Contribution

It provides a next-to-leading-order analysis of oblique parameters in a non-linear electroweak symmetry breaking model with heavy resonances, setting new bounds on their masses.

Findings

Resonance masses must exceed 2 TeV based on oblique parameter constraints.

The analysis extends previous approaches by considering a more general non-linear realization.

Predictions align with earlier simpler models and experimental bounds.

Abstract

Experiments have confirmed the presence of a mass gap between the Standard Model and potential New Physics. Consequently, the exploration of effective field theories to detect signals indicative of Physics Beyond the Standard Model is of great interest. In this study, we examine a non-linear realization of the electroweak symmetry breaking, wherein the Higgs is a singlet with independent couplings, and Standard Model fields are additionally coupled to heavy bosonic resonances. We present a next-to-leading-order determination of the oblique $S$ and $T$ parameters. Comparing our predictions with experimental values allows us to impose constraints on resonance masses, requiring them to exceed the TeV scale ($M_R > 2\,$TeV). This finding aligns with our earlier analysis, employing a less generalized approach and the experimental bounds of that time, where we computed these observables.