2005/05/26 by Howard Baer, Azar Mustafayev, Eun-Kyung Park +2 · 2 citations
Physics and Astronomy · #Astrophysics #Cosmology #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark energy #Dark matter #Gaugino #Large Hadron Collider #Light dark matter #Lightest Supersymmetric Particle #Neutralino #Particle physics #Particle physics theoretical and experimental studies #Physics #Scalar field dark matter #Superpartner #Supersymmetry #Warm dark matter #Weakly interacting massive particles #hep-ph
paper · pdf · doi:10.1088/1126-6708/2005/07/046
published as JHEP 0507:046,2005 · 29 pages including 19 eps figures
arxiv created 2005/05/26 · openalex publication_date 2005/07/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
In supersymmetric models with gravity-mediated SUSY breaking and gaugino mass unification, the predicted relic abundance of neutralinos usually exceeds the strict limits imposed by the WMAP collaboration. One way to obtain the correct relic abundance is to abandon gaugino mass universality and allow a mixed wino-bino lightest SUSY particle (LSP). The enhanced annihilation and scattering cross sections of mixed wino dark matter (MWDM) compared to bino dark matter lead to enhanced rates for direct dark matter detection, as well as for indirect detection at neutrino telescopes and for detection of dark matter annihilation products in the galactic halo. For collider experiments, MWDM leads to a reduced but significant mass gap between the lightest neutralinos so that chi20 two-body decay modes are usually closed. This means that dilepton mass edges-- the starting point for cascade decay reconstruction at the CERN LHC-- should be accessible over almost all of parameter space. Measurement of the m\tz2-m\tz1 mass gap at LHC plus various sparticle masses and cross sections as a function of beam polarization at the International Linear Collider (ILC) would pinpoint MWDM as the dominant component of dark matter in the universe.