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We investigate the prospects to extract supersymmetric couplings from a decaylength measurement at the LHC. Specifically, we exploit the opportunity of alight and long-lived stop which is pair-produced through gluinos in associationwith like-sign top quarks. Any observed finite value of the stop decay lengthstrongly supports models in which flavor is broken in a minimal way solely bythe Standard Model Yukawa couplings. We find that a 1 picosecond stop lifetime,dominated by t~ -> c chi^0 decays, yields macroscopic transverse impactparameters of about 180 microns. If the lightest neutralino is predominantlyhiggsino or very close in mass to the light stop, the stop lifetime evenincreases and allows to observe stop tracks and possibly secondary verticesdirectly. Measuring squark flavor violation with the stop decay length worksalso with a gravitino LSP if the neutralino is the NLSP. For this case,opportunities from t~ -> c chi^0 -> c gamma G~ decays for very light gravitinoswith mass <= keV are pointed out.

Collider Signatures of Minimal Flavor Mixing from Stop Decay Length Measurements