Distinctive Heavy Higgs Decays

TL;DR

This paper explores alternative decay modes of a heavy Higgs boson above the top-antitop threshold, highlighting their potential to reveal new physics beyond the Standard Model.

Contribution

It identifies and analyzes three decay channels of a heavy Higgs that could compete with the dominant decay to top-antitop pairs, offering new avenues for experimental searches.

Findings

Decays $H\to AZ$, $Z'Z'$, and $\tau'\tau'$ can be significant in heavy Higgs phenomenology.

Heavy Higgs decays provide a promising probe for physics beyond the Standard Model.

These decay modes remain relevant even in the alignment limit of 2-Higgs doublet models.

Abstract

For a heavy Higgs boson above the $t\bar t$ threshold we consider three decay modes that could compete with decay to $t\bar t$, even in the alignment limit of a 2-Higgs doublet model. The decays $H\to AZ$, $ Z'Z'$ and $\tau'\tau'$ show that heavy Higgs decays can be an effective probe of new physics both within and beyond this model.