Abstract
We examine gauge coupling unification and prediction for α s ( M Z ) in minimal flipped SU(5) with gauge-mediated supersymmetry breaking. We include threshold corrections at weak scale, messenger scale and unification scale, and explicitly show that in this model there can be either one-step or two-step gauge coupling unification, depending on unification-scale threshold corrections. The experimental value of α s ( M Z ) constrains heavy particle masses in one-step unification. In the case of two-step unification, we examine the prediction for α s ( M Z ) with two-loop, light, messenger and heavy threshold corrections, and find it to be compatible with the updated experimental data.
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