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ATLAS and CMS observe deviations from the expected background in the diphotoninvariant mass searches of new resonances around 750 GeV. We show that a simplerealization in terms of a new pseudoscalar state can accommodate theobservations. 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 symmetrybreaking. We further show how to disentangle the two scenarios. Beyond thepossible explanation of the diphoton excess the results show that it ispossible to directly test and constrain composite dynamics via processesstemming from its distinctive topological sector.

Minimal Composite Dynamics versus Axion Origin of the Diphoton excess