Di-photon resonance around 750 GeV: shedding light on the theory underneath

TL;DR

This paper investigates a 750 GeV di-photon excess observed by ATLAS and CMS, exploring its possible origins and implications within a simplified effective interaction framework, and examining potential new particles involved.

Contribution

It provides a minimal effective interaction model to interpret the 750 GeV di-photon excess and analyzes possible new particles responsible for this signal.

Findings

The excess can be explained by effective interactions with photons and gluons.

Possible new particles include various spins, charges, and color representations.

The study constrains the properties of particles that could mediate the resonance.

Abstract

Both the ATLAS and CMS collaborations have recently observed an excess in the di-photon invariant mass distribution in the vicinity of 750 GeV with a local significance of $\sim3\sigma$. In this article we try to investigate this excess in the context of a minimal simplified framework assuming effective interactions of the hinted resonance with photons and gluons. We scrutinise the consistency of this observation with possible accompanying yet hitherto unseen signatures of this resonance. Subsequently, we try to probe the nature of new particles, e.g., spin, electric charge and number of colour, etc., that could remain instrumental to explain this excess through loop-mediation.