Singlet scalar resonances and the diphoton excess

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Abstract

ATLAS and CMS recently released the first results of searches for diphoton resonances in 13 TeV data, revealing a modest excess at an invariant mass of approximately 750 GeV. We find that it is generically possible that a singlet scalar resonance is the origin of the excess while avoiding all other constraints. We highlight some of the implications of this model and how compatible it is with certain features of the experimental results. In particular, we find that the very large total width of the excess is difficult to explain with loop-level decays alone, pointing to other interesting bounds and signals if this feature of the data persists. Finally we comment on the robust Zγ signature that will always accompany the model we investigate.

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McDermott, S. D., Meade, P., & Ramani, H. (2016). Singlet scalar resonances and the diphoton excess. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 755, 353–357. https://doi.org/10.1016/j.physletb.2016.02.033

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