791 research outputs found
Constraining the Higgs sector from False Vacua in the Next-to-Minimal Supersymmetric Standard Model
We study the mass, the mixing and the coupling with boson of the lightest
Higgs boson in the next-to-minimal supersymmetric standard model. The vacuum
structure of the Higgs potential is analyzed and the new false vacua are
discussed. The significant parameter region can be excluded by requiring that
the realistic vacuum is deeper than false vacua, which result in constraints on
the properties of the lightest Higgs boson.Comment: 23 pages, 8 figure
Flavor structure and coupling selection rule from intersecting D-branes
We study flavor structure and the coupling selection rule in intersecting
D-brane configurations. We formulate the selection rule for Yukawa couplings
and its extensions to generic n-point couplings. We investigate the possible
flavor structure, which can appear from intersecting D-brane configuration, and
it is found that their couplings are determined by discrete abelian symmetry.
Our studies on the flavor structure and the coupling selection rule show that
the minimal matter content of the supersymmetric standard model would have
difficulty to derive realistic Yukawa matrices from stringy 3-point couplings
at the tree-level. However, extended models have a richer structure, leading to
non-trivial mass matrices.Comment: 28 pages, latex, 5 figure
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