Determining the mass for a light gravitino

Gauge mediated supersymmetry breaking scenarios with an ultra-light gravitino of mass m3/2=1–10 eVm3/2=1–10 eV are very interesting, since there is no cosmological gravitino problem. We propose a new experimental determination of the gravitino mass for such an ultra-light gravitino, by measuring a branching ratio of two decay modes of sleptons.