Mixed Wino Dark Matter: consequences for direct, indirect and collider detection

In supersymmetric models with gravity-mediated SUSY breaking and gaugino massunification, the predicted relic abundance of neutralinos usually exceeds thestrict limits imposed by the WMAP collaboration. One way to obtain the correctrelic abundance is to abandon gaugino mass universality and allow a mixedwino-bino lightest SUSY particle (LSP). The enhanced annihilation andscattering cross sections of mixed wino dark matter (MWDM) compared to binodark matter lead to enhanced rates for direct dark matter detection, as well asfor indirect detection at neutrino telescopes and for detection of dark matterannihilation products in the galactic halo. For collider experiments, MWDMleads to a reduced but significant mass gap between the lightest neutralinos sothat chi_2^0 two-body decay modes are usually closed. This means that dileptonmass edges-- the starting point for cascade decay reconstruction at the CERNLHC-- should be accessible over almost all of parameter space. Measurement ofthe m_{\tz_2}-m_{\tz_1} mass gap at LHC plus various sparticle masses and crosssections as a function of beam polarization at the International LinearCollider (ILC) would pinpoint MWDM as the dominant component of dark matter inthe universe.Comment: 29 pages including 19 eps figure