750 GeV diphoton resonance in a visible heavy QCD axion model

In this paper, we revisit a visible heavy QCD axion model in light of the recent reports on the 750 GeV diphoton resonance by the ATLAS and CMS experiments. In this model, the axion is made heavy with the help of the mirror copied sector of the Standard Model, while the successful Peccei-Quinn mechanism is kept intact. We identify the 750 GeV resonance as the scalar boson associated with spontaneous breaking of the Peccei-Quinn symmetry, which mainly decays into a pair of axions. We find that the mixing between the axion and eta and eta' plays important roles in its decays and the resultant branching ratio into two photons. The axion decay length can be suitable for explaining the diphoton excess by the di-axion production when its decay constant f(a) similar or equal to 1 TeV. We also find that our model allows multiple sets of the extra fermions without causing the domain wall problem, which is advantageous to explain the diphoton signal.