Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-04-01
Nucl.Phys. B507 (1997) 3-34
Physics
High Energy Physics
High Energy Physics - Phenomenology
42 pages, LaTexx, 4 eps figures
Scientific paper
10.1016/S0550-3213(97)00569-5
The fine tuning in models of low energy gauge mediated supersymmetry breaking required to obtain the correct $Z$ mass is quantified. To alleviate the fine tuning problem, a model with split $(5+\bar{5})$ messenger fields is presented. This model has additional triplets in the low energy theory which get a mass of $O(500)$ GeV from a coupling to a singlet. The improvement in fine tuning is quantified and the spectrum in this model is discussed. The same model with the above singlet coupled to the Higgs doublets to generate the $\mu$ term is also discussed. A Grand Unified version of the model is constructed and a known doublet-triplet splitting mechanism is used to split the messenger $(5+\bar{5})$'s. A complete model is presented and some phenomenological constraints are discussed.
Agashe Kaustubh
Graesser Michael
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