Scalar Resonances in the Non-linearly Realized Electroweak Theory

TL;DR

This paper proposes a non-linearly realized electroweak model with multiple scalar resonances, analyzing their properties and decay rates, and comparing predictions with LHC data to explore new physics beyond the Standard Model.

Contribution

It introduces a novel scalar sector in a non-linear electroweak framework with multiple resonances, differing from conventional models by decoupling particle masses from spontaneous symmetry breaking.

Findings

The model includes at least four scalar resonances with distinct mass generation mechanisms.

Preliminary LHC data comparison suggests a preference for negative top Yukawa coupling.

The CP-even scalar decay to two photons is explicitly calculated within this framework.

Abstract

We introduce a physical scalar sector in a SU(2)xU(1) electroweak theory in which the gauge group is realized non linearly. By invoking theoretical as well as experimental constraints, we build a phenomenologically viable model in which a minimum of four scalar resonances appear, and the mass of the CP even scalar is controlled by a vacuum expectation value; however, the masses of all other particles (both matter as well as vector boson fields) are unrelated to spontaneous symmetry breaking and generated by the St\"uckelberg mechanism. We evaluate in this model the CP-even scalar decay rate to two photons and use this amplitude to perform a preliminary comparison with the recent LHC measurements. As a result, we find that the model exhibits a preference for a negative Yukawa coupling between the top quark and the CP-even resonance.