Split supersymmetry and dark matter generation

Abstract

We analyze a simple Split Supersymmetry scenario based on anomaly mediation, where scalar masses are near 1000 TeV, the gravitino mass is near 100 TeV, and fermions are near 1 TeV. We find that the decay chain of moduli fields to gravitinos to LSPs generates dark matter more efficiently than perturbative freeze-out, allowing for a light, LHC visible spectrum. These decaying moduli can also weaken cosmological constraints on the axion decay constant. With squark masses of order 1000 TeV, LHC gluinos will decay millimeters from their primary vertices, resulting in a striking experimental signature, and the suppression of Flavor Changing Neutral Currents is almost sufficient to allow arbitrary mixing in squark mass matrices

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