Flavor Structure of Scherk-Schwarz Supersymmetry Breaking and Constraints from Low Energy Processes

5D orbifold has two attractive features: quasi-localized matter fields can natu-rally reproduce hierarchical Yukawa coupling, while supersymmetry breaking is inherently built in by the Scherk-Schwarz mechanism. We examine the conse-quence of this quasi-localization and the Scherk-Schwarz supersymmetry break-ing in low energy flavor violating processes, under the assumption that physics below the compactification scale is described by the minimal supersymmetric standard model (MSSM) and find BR(µ → e, γ) and K impose stringent con-straint on flavor structure of the Scherk-Schwarz supersymmetry breaking. Chi-rality measurement in lepton flavor violating processes is crucial to deduce the surviving flavor structure. Localization of matter fields along the extra-dimension can naturally reproduce ob-served Yukawa hierarchy [1], while the Scherk-Schwarz mechanism provides a simple al-ternative way to break supersymmetry [2]. 5D orbifold S1/Z2 is a minimal realization of both of these attractive features of introducing new dimensions. Let us first define the model using 5D bulk action on S1 in terms of 4D superfield representation [3]