Abstract
We study models in which the 750 GeV diphoton excess is due to a scalar decaying to two pseudo-Nambu-Goldstone bosons that subsequently decay into two pairs of highly boosted photons, misidentified as individual photons. Performing a model independent analysis we find that, with axion mass around 200 MeV, this class of theories can naturally explain the observed signal with a large width, without violating monojet constraints. At the same time the requirement of a prompt axion decay can be satisfied only with a relatively large axion-photon coupling, leading to many new charged particles at the TeV scale. However, the required multiplicities of such fields is still moderately reduced relative to models with direct diphoton production.
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Aparicio, L., Azatov, A., Hardy, E. et al. Diphotons from diaxions. J. High Energ. Phys. 2016, 77 (2016). https://doi.org/10.1007/JHEP05(2016)077
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DOI: https://doi.org/10.1007/JHEP05(2016)077