On the $W$-mass and New Higgs Bosons

TL;DR

This paper explores how a simple extension of the Standard Model with a real scalar triplet can naturally explain the CDF II $W$ mass measurement, predicting new Higgs bosons with specific decay properties.

Contribution

It introduces a minimal scalar triplet extension that accounts for the $W$ mass shift and details the properties and decay modes of the new Higgs bosons.

Findings

The model explains the $W$ mass shift without altering the $Z$ mass.

Predicted decay widths for the new charged Higgs bosons.

The neutral Higgs decays mainly into $W$ boson pairs with suppressed fermion couplings.

Abstract

We discuss the prediction of the $W$ boson mass in a simple extension of the Standard Model ($\Sigma {\rm SM}$) with a real scalar triplet. A shift in the $W$ mass as reported by the CDF II collaboration can naturally be accommodated by the model without modifying the Standard Model value for the $Z$ mass. We discuss the main implications and the properties of the new Higgs bosons. Namely, the partial decay widths of the new charged Higgs are predicted. Furthermore, the neutral Higgs has suppressed couplings to fermions and decays predominantly into a pair of $W$ gauge bosons.