Higgs mixing and diphoton rate enhancement in NMSSM models

Understand

We study the implications of the LHC Higgs signals on the Higgs mixing in the next-to-minimal supersymmetric standard model (NMSSM).

• The Higgs couplings can depart from their values in the standard model (SM) due to mixing effects.
• However the Higgs signal rate in the WW and ZZ channels can remain close to the SM values, as observed at the LHC, even if the SM-like Higgs boson with a mass near 125 GeV has a large singlet component.
• This allows to get a sizable enhancement in the Higgs to diphoton rate through the charged-higgsino loop contribution, as well as a sizable reduction of the Higgs to bb and tautau rates through the mixing effects, with little deviation in the WW and ZZ signal rates from the SM prediction.