* Title: Phenomenology of a 750 GeV Singlet

* Abstract: A singlet scalar interpretation of the recently reported diphoton excess at the LHC is to be discussed. The singlet scalar possibly mixes with the Standard Model Higgs boson. Here it is shown 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 decay width.

* Refereces : 1512.05777 Falkowski, Slone, Volansky

                     1512.07853 Cheung, Ko, Lee, Park, Tseng

                     1512.08307 Son, Urbano