Searching for the Flavon in the diphoton channel at future super hadron colliders

TL;DR

This paper explores the potential to detect a CP-even flavon particle via the diphoton channel at future super hadron colliders, analyzing production, decay, and experimental prospects within a Froggatt-Nielsen flavor symmetry model.

Contribution

It provides a detailed analysis of flavon production and decay in a specific flavor model, identifying parameter spaces where detection is feasible at future colliders.

Findings

Signal significance of 5σ for flavon masses 200-450 GeV at the High-Energy LHC.

Potential to probe flavon masses up to 1 TeV at the Future Circular Collider.

Detection prospects improve with higher integrated luminosities.

Abstract

We study the production of a CP-even flavon $H_F$ in proton-proton collisions and the prospects for its detection via the diphoton channel at future super hadron colliders, i.e., $pp\to H_F\to\gamma\gamma$. The theoretical framework adopted is a model that invokes the Froggatt-Nielsen mechanism with an Abelian flavor symmetry, which includes a Higgs doublet and a complex singlet. We confront the free parameters of the model against theoretical and experimental constraints to find the allowed parameter space, which is then used to evaluate the production cross section of the flavon and the branching ratio of its decay into two photons. We find promising results based on specific benchmark points, achieving signal significances at the level of 5$\sigma$ for flavon masses in the interval $200\lesssim M_{H_F}\lesssim 450$ and integrated luminosities in the range $5-12$ ab$^{-1}$ at the future High-Energy LHC. On the other hand, the Future hadron-hadron Circular Collider could probe masses up to 1 TeV if it reaches an integrated luminosity of at least 2 ab$^{-1}$.