2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/187558Gauge mediated supersymmetry breaking scenarios with an ultra-light gravitino of mass m_{3/2}=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.9 pages, 12 figuresHigh Energy Physics - Phenomenologytext