Baer, Howard and Krupovnickas, Tadas and Mustafayev, Azar and Park, Eun-Kyung and Profumo, Stefano and Tata, Xerxes (2005) Exploring the BWCA (Bino-Wino co-annihilation) scenario for neutralino dark matter. Journal of High Energy Physics, 2005 (12). Art. no. 011. ISSN 1029-8479 http://resolver.caltech.edu/CaltechAUTHORS:BAEjhep05
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In supersymmetric models with non-universal gaugino masses, it is possible to have opposite-sign SU(2) and U(1) gaugino mass terms. In these models, the gaugino eigenstates experience little mixing so that the lightest SUSY particle remains either pure bino or pure wino. The neutralino relic density can only be brought into accord with the WMAP measured value when bino-wino co-annihilation (BWCA) acts to enhance the dark matter annihilation rate. We map out parameter space regions and mass spectra which are characteristic of the BWCA scenario. Direct and indirect dark matter detection rates are shown to be typically very low. At collider experiments, the BWCA scenario is typified by a small mass gap mtilde Z2-mtilde Z1 ~ 20-80 GeV, so that tree level two body decays of tilde Z2 are not allowed. However, in this case the second lightest neutralino has an enhanced loop decay branching fraction to photons. While the photonic neutralino decay signature looks difficult to extract at the Fermilab Tevatron, it should lead to distinctive events at the CERN LHC and at a linear e+e- collider.
|Additional Information:||© 2005 Institute of Physics Received 8 November 2005, accepted for publication 22 November 2005, Published 6 December 2005 We thank K. Melnikov for the idea of using effective theories in quantum mechanics, as discussed in the appendix. This research was supported in part by the U.S. Department of Energy grant numbers DE-FG02-97ER41022, DE-FG03-94ER40833. T. K. was supported in part by the U.S. Department of Energy under contract No. DE-AC02-98CH10886. E-print number: hep-ph/0511034|
|Subject Keywords:||Supersymmetry Phenomenology, Hadronic Colliders, Supersymmetric Standard Model|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Archive Administrator|
|Deposited On:||17 Feb 2006|
|Last Modified:||26 Dec 2012 08:45|
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