Strong dynamics or axion origin of the diphoton excess

Preprint number: CP3-Origins-2015-52 DNRF90 and DIAS-2015-52
Author: Emiliano Molinaro (CP3-Origins & DIAS)
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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 composite state stemming from minimal models of dynamical electroweak symmetry breaking. We further provide insights on how to disentangle the two scenarios.