A low energy dynamical SUSY breaking scenario motivated from superstring derived unification

Abstract

Recently there has been a resurgence of interest in gauge mediated dynamical supersymmetry breaking scenarios. I investigate how low energy dynamical SUSY breaking may arise from superstring models. In a three generation string derived model I propose that the unbroken hidden non--Abelian gauge group at the string scale is $SU(3{)}_H$ with matter multiplets. Due to the small gauge content of the hidden gauge group the supersymmetry breaking scale may be consistent with the dynamical SUSY breaking scenarios. The messenger states are obtained in the superstring model from sectors which arise due to the ``Wilson--line'' breaking of the unifying non--Abelian gauge symmetry. An important property of the string motivated messenger states is the absence of superpotential terms with the Standard Model states. The stringy symmetries therefore forbid the flavor changing processes which may arise due to couplings between the messenger sector states and the Standard Model states. Motivated from the problem of string gauge coupling unification I contemplate a scenario in which the messenger sector consists solely of color triplets. This hypothesis predicts a chargino mass below the $W$--boson mass. Imposing the current limits from the LEP1 and LEP1.5 experiments the lightest supersymmetric particles predicted by this hypothesis are in the mass ranges $M_{{\chi }^{\pm }}\approx 55-65$ GeV, $M_{{\chi }^0}\approx 35-50$ GeV and $M_{\tilde{\nu }}\approx 45-60$ GeV which will be tested in the forthcoming LEP2 experiments.

15 pages. Standard Latex. 6 figures. epsf.tex. Title corrected in file. Figures corrected

Cited by in corpus (13)

• Generalized messengers of supersymmetry breaking and the sparticle mass spectrum
• Variations on Minimal Gauge Mediated Supersymmetry Breaking
• Signals for gauge-mediated supersymmetry breaking models at the CERN LEP2 collider
• Weak-scale phenomenology of models with gauge-mediated supersymmetry breaking
• Theory-Motivated Benchmark Models and Superpartners at the Tevatron
• Constraints from $b\to s\gamma$ on gauge-mediated supersymmetry breaking models
• A Family--Universal Anomalous U(1) in String Models as the Origin of Supersymmetry Breaking and Squark Degeneracy
• Adjoint Messengers and Perturbative Unification at the String Scale
• Experimental consequences of no-scale supergravity in light of the CDF $ee\gamma \gamma$ event
• Local discrete symmetries from superstring derived models
• Hadron colliders as the ``neutralino factory'': Search for a slow decay of the lightest neutralino at the CERN LHC
• CP violation in realistic String Models with family universal anomalous U(1)
• Realistic GUT with Gauge Mediated Supersymmetry Breaking