Higgs Mixing in the NMSSM and Light Higgsinos

Higgs Mixing in the NMSSM and Light Higgsinos Kwang Sik Jeong a,b∗, Yutaro Shoji c†, Masahiro Yamaguchi c‡ a DESY, Notkestrasse 85, 22607 Hamburg, Germany b Center for Theoretical Physics of the Universe, IBS, Daejeon 305-811, Korea c Department of Physics, Tohoku University, Sendai 980-8578, Japan Abstract We explore the effects of Higgs mixing in the general next-to-minimal supersymmetric Standard Model (NMSSM). Extended to include a gauge singlet, the Higgs sector can naturally explain the observed Higgs boson mass in TeV scale supersymmetry without invoking large stop mixing. This is particularly the case when the singlet scalar is light so that singlet-doublet mixing increases the mass of the SM-like Higgs boson. In such a case the Higgs mixing has interesting implications following from the fact that the higgsino mass parameter and the singlet coupling to Higgs bilinear crucially depend on the Higgs boson masses and mixing angles. For the mixing compatible with the current LHC data on the Higgs signal rates, the higgsinos are required to be relatively light, around or below a few hundred GeV, as long as the heavy doublet Higgs boson has a mass smaller than about 250 √ tan β GeV and the singlet-like Higgs boson is consistent with the LEP constraint. In addition, the Higgs coupling to photons can receive a sizable contribution of either sign from the charged-higgsino loops combined with singlet-doublet mixing.