Higgs Bosons Near 125 GeV in the NMSSM with Constraints at the GUT Scale

摘要

We study the NMSSM with universal Susy breaking terms (besides the Higgssector) at the GUT scale. Within this constrained parameter space, it is not difficultto find a Higgs boson with a mass of about 125 GeV and an enhanced cross-section inthe diphoton channel. An additional lighter Higgs boson with reduced couplings and amass≲123 GeV is potentially observable at the LHC. The NMSSM-specific Yukawacouplingsλandκare relatively large and tanβis small, such thatλ,κ, and the topYukawa coupling are of𝒪(1)at the GUT scale. The lightest stop can be as lightas 105 GeV, and the fine-tuning is modest. WMAP constraints can be satisfied bya dominantly Higgsino-like LSP with substantial bino, wino, and singlino admixturesand a mass of~60–90 GeV, which would potentially be detectable by XENON100.