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      A Realistic Extension of Gauge-Mediated SUSY-Breaking Model with Superconformal Hidden Sector

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          Abstract

          The sequestering of supersymmetry (SUSY) breaking parameters, which is induced by superconformal hidden sector, is one of the solutions for the mu/B_mu problem in gauge-mediated SUSY-breaking scenario. However, it is found that the minimal messenger model does not derive the correct electroweak symmetry breaking. In this paper we present a model which has the coupling of the messengers with the SO(10) GUT-symmetry breaking Higgs fields. The model is one of the realistic extensions of the gauge mediation model with superconformal hidden sector. It is shown that the extension is applicable for a broad range of conformality breaking scale.

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          Dynamical Supersymmetry Breaking Simplified

          We present a model in which supersymmetry is dynamically broken at comparatively low energies. Previous efforts to construct simple models of this sort have been hampered by the presence of axions. The present model, which exploits an observation of Bagger, Poppitz and Randall to avoid this problem, is far simpler than previous constructions. Models of this kind do not suffer from the naturalness difficulties of conventional supergravity models, and make quite definite predictions for physics over a range of scales from \(100\)'s of GeV to \(1000\)'s of TeV. Thus ``Renormalizable Visible Sector Models'' are a viable alternative to more conventional approaches. Our approach also yields a viable example of hidden sector dynamical supersymmetry breaking.
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            Dynamical Supersymmetry Breaking at Low Energies

            Conventional approaches to supersymmetric model building suffer from several naturalness problems: they do not explain the large hierarchy between the weak scale and the Planck mass, and they require fine tuning to avoid large flavor changing neutral currents and particle electric dipole moments. The existence of models with dynamical supersymmetry breaking, which can explain the hierarchy, has been known for some time, but efforts to build such models have suffered from unwanted axions and difficulties with asymptotic freedom. In this paper, we describe an approach to model building with supersymmetry broken at comparatively low energies which solves these problems, and give a realistic example.
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              More Visible Effects of the Hidden Sector

              There is a growing appreciation that hidden sector dynamics may affect the supersymmetry breaking parameters in the visible sector (supersymmetric standard model), especially when the dynamics is strong and superconformal. We point out that there are effects that have not been previously discussed in the literature. For example, the gaugino masses are suppressed relative to the gravitino mass. We discuss their implications in the context of various mediation mechanisms. The issues discussed include anomaly mediation with singlets, the mu (B mu) problem in gauge and gaugino mediation, and distinct mass spectra for the superparticles that have not been previously considered.
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                Author and article information

                Journal
                25 October 2008
                2009-02-06
                Article
                10.1016/j.physletb.2009.02.010
                0810.4606
                b173509d-3746-419a-ad07-9c53c6be6e57

                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

                History
                Custom metadata
                ICRR-REPORT-532, IPMU 08-0081
                Phys.Lett.B673:146-151,2009
                15 pages, 2 figures, 1 table
                hep-ph

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