LHC diphoton excess from colorful resonances

TL;DR

This paper proposes a coloron model from a broken SU(3) gauge symmetry to explain the 750 GeV diphoton excess observed at the LHC, predicting new colored particles and signals for future validation.

Contribution

It introduces a novel coloron model with a cascade decay mechanism that accounts for the diphoton excess while satisfying existing constraints.

Findings

Explains the diphoton excess via a cascade decay process.

Predicts new colored particles detectable at the LHC.

Accounts for the absence of excess at 8 TeV searches.

Abstract

Motivated by the possible diphoton excess around $750~\rm{GeV}$ observed by ATLAS and CMS at $13~\rm{TeV}$, we consider a coloron model from $\rm{SU}(3)_1 \times \rm{SU}(3)_2$ spontaneously breaking to the Standard Model $\rm{SU}(3)_C$. A colored massive vector boson is resonantly produced by $q \bar q $ in proton collision, followed by a colored scalar cascade decay. This process gives two photons and one jet in the final states. And the kinetic edge of the two photons can be an interpretation of the diphoton excess, while satisfying the dijet, $\rm{t}\bar{t}$, jet+photon resonance constraints. In this model, due to the large mass of vector resonance, the parton luminosity function ratio between $13~\rm{TeV}$ and $8~\rm{TeV}$ can be quite large. Therefore, the diphoton excess has not been observed at $8~\rm{TeV}$ search. On the other hand, having all the new particles color-charged around $\rm{TeV}$, this model predicts new signals at the LHC, which can be validated soon.