106 research outputs found
A Light Stop with a Heavy Gluino: Enlarging the Stop Gap
It is widely thought that increasing bounds on the gluino mass, which feeds
down to the stop mass through renormalization group running, are making a light
stop increasingly unlikely. Here we present a counter-example. We examine the
case of the Minimal Composite Supersymmetric Standard Model which has a light
composite stop. The large anomalous dimension of the stop from strong dynamics
pushes the stop mass toward a quasi-fixed point in the infrared, which is
smaller than standard estimates by a factor of a large logarithm. The gluino
can be about three times heavier than the stop, which is comparable to
hierarchy achieved with supersoft Dirac gluino masses. Thus, in this class of
models, a heavy gluino is not necessarily indicative of a heavy stop.Comment: 6 pages, 1 figur
Exploring Softly Broken SUSY Theories via Grassmannian Taylor Expansion
We demonstrate that soft SUSY breaking introduced via replacement of the
couplings of a rigid theory by spurion superfields has far reaching
consequences. Substituting these modified couplings into renormalization
constants, RG equations, solutions to these equations, fixed points, finiteness
conditions, etc., one can get corresponding relations for the soft terms by a
simple Taylor expansion over the Grassmannian variables. This way one can get
new solutions of the RG equations. Some examples including the MSSM, SUSY GUTs
and the N=2 Seiberg-Witten model are given.Comment: Latex, 10pp, no figure
Duality of a Supersymmetric Standard Model
We examine a dual theory of a Supersymmetric Standard Model(SSM) in terms of
an gauge group. In this scenario, it is naturally understood that at
least one quark (the top quark) should be heavy, i.e., almost the same order as
the weak scale. Moreover, the supersymmetric Higgs mass parameter can
naturally be expected to be small. This model automatically induces nine pairs
of composite Higgs fields, which may be observed in the near future.Comment: 9 pages, LaTe
Duality Symmetric Actions with Manifest Space-Time Symmetries
We consider a space-time invariant duality symmetric action for a free
Maxwell field and an invariant effective action
describing a low-energy bosonic sector of the heterotic string compactified on
a six-dimensional torus. The manifest Lorentz and general coordinate invariant
formulation of the models is achieved by coupling dual gauge fields to an
auxiliary vector field from an axionic sector of the theory.Comment: 9 pages, LaTeX, no figures, references added, misprints eliminate
Duality in SUSY with an Antisymmetric Tensor
We present a dual description for supersymmetric gauge theory with an
antisymmetric tensor and fundamentals, and no superpotential. This duality is
derived from the dualities of Seiberg. Under a perturbation of the
superpotential, the dual theory breaks supersymmetry at tree level.Comment: 8 pages, uses harvmac, no figure
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