Phenomenology of a 750 GeV singlet

Adam Falkowski*, Oren Slone, Tomer Volansky

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Article number152
Pages (from-to)1-21
Number of pages21
JournalJournal of High Energy Physics
Issue number2
StatePublished - 1 Feb 2016


  • Beyond Standard Model
  • Higgs Physics


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