Reach of the Fermilab Tevatron and CERN LHC for gaugino mediated SUSY breaking models

In supersymmetric models with gaugino mediated SUSY breaking (gMSB), it is assumed that SUSY breaking on a hidden brane is communicated to the visible brane via gauge superfields which propagate in the bulk. This leads to GUT models where the common gaugino mass m1/2 is the only soft SUSY breaking term to receive contributions at the tree level. To obtain a viable phenomenology, it is assumed that the gaugino mass is induced at some scale Mc beyond the GUT scale, and that additional renormalization group running takes place between Mc and MGUT as in a SUSY GUT. We assume an SU(5) SUSY GUT above the GUT scale, and compute the SUSY particle spectrum expected in models with gMSB. We use the Monte Carlo program ISAJET to simulate signals within the gMSB model, and compute the SUSY reach including cuts and triggers appropriate to Fermilab Tevatron and CERN LHC experiments. We find no reach for SUSY by the Tevatron collider in the trilepton channel. At the CERN LHC, values of m1/2=1000 (1160) GeV can be probed with 10 (100) fb^-1 of integrated luminosity, corresponding to a reach in terms of m_ ̃ \~g of 2150 (2500) GeV. The gMSB model and MSUGRA can likely only be differentiated at a linear e⁺e^- collider with sufficient energy to produce sleptons and charginos.