Scrutinizing a di-photon resonance at the LHC through Moscow zero

TL;DR

This paper analyzes constraints from LHC diphoton searches on models where a scalar resonance decays into light pseudoscalars, which mimic photons, and discusses implications for dark matter within a dynamically generated mass framework.

Contribution

It introduces a model with dynamically generated masses and vector-like fermions, exploring its compatibility with LHC data and dark matter constraints.

Findings

Strong constraints on pseudoscalar decay models from LHC data

A viable dark matter candidate naturally emerges in the model

Upcoming LHC data can probe the model's couplings

Abstract

The ATLAS and CMS collaborations have recently released their new analyses of the diphoton searches. We look in detail the consequences of their results deriving strong constraints on models where a scalar resonance $s$ decays into two light pseudoscalars which in turn decay into two pairs of collimated photons, mis-identified with two real photons. In our construction, all mass terms are generated dynamically, and only one pair of vector-like fermions generate couplings which will be probed using the upcoming LHC data. Moreover, we show that a stable dark matter candidate, respecting the cosmological constraints, is naturally affordable in the model.