Direct-Transmission Models of Dynamical Supersymmetry Breaking

Abstract

We systematically construct gauge-mediated supersymmetry(SUSY)-breaking models with direct transmission of SUSY-breaking effects to the standard-model sector. We obtain a natural model with the gravitino mass $m_{3/2}$ smaller than 1 keV as required from the standard cosmology. If all Yukawa coupling constants are of order one,the SUSY-breaking scale $m_{SUSY}$ transmitted into the standard-model sector is given by $m_{SUSY}\simeq 0.1{\alpha }_i/(4\pi )\Lambda$ where $\Lambda$ is the original dynamical SUSY-breaking scale. Imposing $m_{SUSY}\simeq (10^2-10^3)$ GeV, we get $\Lambda \simeq (10^5-10^6)$ GeV, which yields the gravitino mass $m_{3/2}\simeq (10^{-2}-1)$ keV.

18 pages, Latex, 5 Postscript figures

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• A Solution to the $\mu$ Problem in Gauge-mediated Supersymmetry-breaking Models

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