Diphoton excess at 750 GeV: Singlet scalars confront triviality

TL;DR

This paper proposes a model where a set of gauge singlet scalars explains the 750 GeV diphoton excess via loop-mediated decays involving vector-like fermions, maintaining perturbativity and potential stability.

Contribution

It introduces a novel singlet scalar model with vector-like fermions to explain the diphoton excess while ensuring perturbative Yukawa couplings and potential stability.

Findings

Explains the broad resonance with quasi-degenerate scalars.

Maintains Yukawa couplings within the perturbative regime.

Addresses the stability of the scalar potential.

Abstract

We suggest that the recently observed diphoton excess at 750 GeV comes from a quasi-degenerate bunch of gauge singlet scalars produced and decaying through one or more vector-like fermions. This explains the broad nature of the resonance, even though the decay is loop-mediated. At the same time, the model keeps the new Yukawa couplings in the perturbative region, which is necessary for the stability of the potential.