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It is sometimes argued that a virtue of pushing the supersymmetry breakingscale above 1 PeV is that no particular flavor structure is required in thesoft sector in order to evade bounds on flavor-changing neutral currents.However, without flavor structure, suppressing generic Planck-suppressedcontributions to proton decay requires even higher SUSY scales, of order$10^{11}$ ($10^9$) GeV for degenerate (mini-split) gauginos and scalars. Withflavor structure, the question of whether proton decay or flavor symmetries aremore constraining is model-dependent, but it straightforward to find simplemodels where both constraints are satisfied for much lower SUSY scales.

Proton Decay at $M_{pl}$ and the Scale of SUSY-Breaking