383 research outputs found
Upper Bounds on Gluino, Squark and Higgisino Masses in the Focus Point Gaugino Mediation with a Mild Fine Tuning
We show that upper bounds on the masses for gluino, squarks and higgsino are
TeV, TeV and
GeV in a focus point gaugino mediation. Here, we impose a mild fine tuning
. This result shows that it is very challenging for the LHC to
exclude the focus point gaugino mediation with the mild fine tuning. However,
the ILC may have a potential for excluding the focus point gaugino mediation
with such a mild fine tuning. It is also shown that vector-like matters reduce
the required masses of the squark (stop) and gluino to explain the observed
Higgs boson mass and enhance the testability of the model at the LHC. The
fine-tuning is still kept mild.Comment: 13 pages, 2 figure
Focus Point in Gaugino Mediation ~ Reconsideration of the Fine-tuning Problem ~
We reconsider the fine-tuning problem in SUSY models, motivated by the recent
observation of the relatively heavy Higgs boson and non-observation of the SUSY
particles at the LHC. Based on this thought, we demonstrate a focus point-like
behavior in a gaugino mediation model, and show that the fine-tuning is indeed
reduced to about 2 percent level if the ratio of the gluino mass to wino mass
is about 0.4 at the GUT scale. We show that such a mass ratio may arise
naturally in a product group unification model without the doublet-triplet
splitting problem. This fact suggests that the fine-tuning problem crucially
depends on the physics at the high energy scale.Comment: 13 pages, 4 figures; published versio
Coupling Supersymmetric Nonlinear Sigma Models to Supergravity
It is known that supersymmetric nonlinear sigma models for the compact Kahler
manifolds G/H cannot be consistently coupled to supergravity, since the Kahler
potentials are not invariant under the G transformation. We show that the
supersymmetric nonlinear sigma models can be deformed such that the Kahler
potential be exactly G-invariant if and only if one enlarges the manifolds by
dropping all the U(1)'s in the unbroken subgroup H. Then, those nonlinear sigma
models can be coupled to supergravity without losing the G invariance.Comment: 14 pages, LaTeX2
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