Viable Alternative to the Standard Model

TL;DR

This paper proposes a two-scalar-doublet model as an alternative to the Standard Model, predicting specific deviations in Higgs decay rates, especially an increased gamma-gamma decay rate and unchanged or increased bottom and tau decay widths.

Contribution

It introduces a novel two-doublet scalar model with specific predictions for Higgs decay rates, differing from the Standard Model.

Findings

Gamma(H→γγ) is predicted to be 28.1% higher than the Standard Model.

Gamma(H→bb) and Gamma(H→ττ) are predicted to be greater than or equal to Standard Model values.

The model provides explicit testable predictions for Higgs decay channels.

Abstract

As an alternative to the standard model, we couple two scalar doublets such that, in the third family, one (${\cal H}$) couples only to the top quark, the other ($H$), that is identified as the 126 GeV state already observed, to the bottom quark and the tau lepton. Three explicit predictions of the model are that the partial decay rate $\Gamma(H \rightarrow \gamma \gamma)$ is 28.1\% higher than predicted by the standard model, and the two partial decay widths $\Gamma(H \rightarrow \bar{b}b)$ and $\Gamma(H \rightarrow \bar{\tau}\tau)$ are both predicted to be greater than, or equal to, their standard model values.