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arXiv · 1512.05777

Phenomenology of a 750 GeV Singlet

Adam Falkowski·Oren Slone·Tomer Volansky
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Abstract

We study the recently reported excess in the diphoton resonance search by ATLAS and CMS. We investigate the available parameter space in the combined run-1 and run-2 diphoton data and study its interpretation in terms of a singlet scalar field which possibly mixes with the Standard Model Higgs boson. We show that the mixing angle is already strongly constrained by high-mass Higgs searches in the diboson channel, and by Higgs coupling measurements. While a broad resonance is slightly favored, we argue that the signal is consistent with a narrow-width singlet which couples to colored and electromagnetically-charged vector-like fermions. Dijet signals are predicted and may be visible in upcoming analyses. Allowing for additional decay modes could explain a broader resonance, however, we show that monojet searches disfavor a large invisible width. Finally, we comment on the possible relation of this scenario to the naturalness problem.

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Adam Falkowski, Oren Slone, Tomer Volansky. 2016-05-09. Phenomenology of a 750 GeV Singlet. https://doi.org/10.1007/jhep02(2016)152

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