A Higgs boson near 125 GeV with enhanced di-photon signal in the NMSSM
Ulrich Ellwanger
TL;DR
This paper explores how the NMSSM can naturally produce a 125 GeV Higgs with an enhanced di-photon signal due to singlet-doublet mixing, and predicts a potentially observable lighter Higgs.
Contribution
It identifies a parameter space in the NMSSM where the Higgs signal is enhanced and predicts the existence of a second lighter Higgs boson.
Findings
Enhanced di-photon signal in the NMSSM at 125 GeV
Reduced Higgs decay width into bb due to mixing
Potential observability of a lighter Higgs at the LHC
Abstract
A natural region in the parameter space of the NMSSM can accomodate a CP-even Higgs boson with a mass of about 125 GeV and, simultaneously, an enhanced cross section times branching ratio in the di-photon channel. This happens in the case of strong singlet-doublet mixing, when the partial width of a 125 GeV Higgs boson into bb is strongly reduced. In this case, a second lighter CP-even Higgs boson is potentially also observable at the LHC.
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