Is an axizilla possible for di-photon resonance?

TL;DR

This paper explores the theoretical possibility of heavy axion-like particles, called axizillas, explaining how they could produce di-photon resonance signals at collider experiments through specific decay chains involving TeV-scale heavy quarks.

Contribution

It proposes a model where axizillas couple to gauge anomalies and can generate observable di-photon signals via heavy quark decays, expanding the understanding of axion-like particles.

Findings

Axizillas can have BR to two photons >10% and to two Z's <10%.

A TeV-scale heavy quark can produce the required di-photon cross section.

Decay chains involving heavy quarks can fit the observed resonance levels.

Abstract

Heavy axion-like particles, called axizillas, are simple extensions of the standard model(SM). An axizilla is required not to couple to the quarks, leptons, and Brout-Englert-Higgs doublets of the SM, but couple to the gauge anomalies of the $W^\pm, Z$ and photon. It is possible to have its branching ratios(BRs) to two photons greater than 10% and to two $Z$'s less than 10%. To have a (production cross section)$\cdot $(BR to di-photons) at a $10^{-38}\,\textrm{cm}^2$ level, a TeV scale heavy quark $Q$ is required for the gluon--quark fusion process. The decay of $Q$ to axizilla plus quark, and the subsequent decay of the axizilla to two photons can be fitted at the required level of $10^{-38}\,\textrm{cm}^2$.