A 750 GeV Dark Pion: Cousin of a Dark G-parity-odd WIMP

TL;DR

This paper proposes a unified dark QCD model explaining the 750 GeV diphoton resonance and a WIMP dark matter candidate, predicting new particles accessible at the LHC and constraining WIMP mass.

Contribution

It introduces a dark QCD framework with dark G-parity that links the diphoton resonance to a dark matter candidate, providing testable predictions.

Findings

The model explains the 750 GeV diphoton excess and dark matter abundance simultaneously.

Predicts additional dark G-even and G-odd color-octet pions observable at the LHC.

WIMP mass is constrained to be between 613 and 750 GeV in the 5+5bar model.

Abstract

We point out a potential common origin of the recently observed 750 GeV diphoton resonance and a Weakly Interacting Massive Particle (WIMP) candidate. In a dark QCD sector with an unbroken dark G-parity, the diphoton resonance could be a dark G-even pion, while the WIMP could be the lightest dark G-odd pion. Both particles are Standard Model gauge singlets and have the same decay constant. For the dark pion decay constant of around 500 GeV, both the diphoton excess at the LHC and the dark matter thermal abundance can be accommodated in our model. Our model predicts additional dark G-even and dark G-odd color-octet pions within reach of the 13 TeV LHC runs. For the 5 + 5bar model, compatible with the Grand Unified Theories, the WIMP mass is predicted to be within (613, 750) GeV.