Phenomenology of Light Gauginos

Original · EN

I advocate the virtues of a very economical version of the minimal supersymmetric standard model which avoids cosmological problems often encountered in dynamical SUSY-breaking and solves the SUSY-CP problem. Imposing mZ=91 GeV and mₜ 175 GeV implies that scalar masses are generally 100-200 GeV. The gluino and photino are massless at tree level. At 1-loop, the gluino mass is predicted to be in the range m: 100 - 600 MeV and the photino mass can be estimated to be m: 100 - 1400 MeV. New hadrons with mass 1 1/2 GeV are predicted and described. The ``extra'' flavor singlet pseudoscalar observed in two experiments in the ι(1440) region, if confirmed, is naturally interpreted as the state which gets its mass via the QCD anomaly. Its superpartner, a gluon-gluino bound state, generally has a lifetime longer than 5 10⁻¹¹ sec and would not have shown up in existing searches. Search strategies and other consequences of the scenario are discussed.