The Minimal Model of a Diphoton Resonance: Production without Gluon Couplings

TL;DR

This paper explores a minimal model for a 750 GeV diphoton resonance produced via photon-photon fusion without gluon couplings, providing a simple explanation for the early LHC diphoton anomaly.

Contribution

It introduces a minimal theoretical framework for a photon-coupled resonance produced through photon fusion, avoiding gluon interactions, and estimates its production rate at the LHC.

Findings

Production cross sections of 5-10 fb at 13 TeV are achievable.

The model explains the early LHC diphoton excess with a partial photon width of 15 GeV.

Production depends only on mass, spin, width, and photon branching ratio.

Abstract

We consider the phenomenology of a resonance that couples to photons but not gluons, and estimate its production rate at the LHC from photon-photon fusion in elastic pp scattering using the effective photon and narrow width approximations. The rate is sensitive only to the mass, the spin, the total width of the resonance, and its branching fraction to photons. Production cross sections of 5-10 fb at 13 TeV can be easily accommodated for a 750 GeV resonance with partial photon width of 15 GeV. This provides the minimal explanation of the reported diphoton anomaly in the early LHC Run II data.