Minimal Composite Dynamics versus Axion Origin of the Diphoton excess

Understand

ATLAS and CMS observe deviations from the expected background in the diphoton invariant mass searches of new resonances around 750 GeV.

• We show that a simple realization in terms of a new pseudoscalar state can accommodate the observations.
• The model leads to further footprints that can be soon observed.
• The new state can be interpreted both as an axion or as a {highly natural} composite state arising from minimal models of dynamical electroweak symmetry breaking.