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hep-ph/0110072 Higgsino and Wino Dark Matter from Q-ball Decay

By Masaaki Fujii and K. Hamaguchi

Abstract

We claim that the Higgsino-like and wino-like neutralinos can be good dark matter candidates if they are produced by the late time decay of Q-ball. The late time decays of the Q-balls into these LSP’s and subsequent pair annihilations of the LSP’s naturally lead to the desired mass density of dark matter. Furthermore, these dark matter can be much more easily detected by the dark-matter search experiments than the standard bino-like dark matter. Supersymmetry (SUSY) has been widely considered as an attractive framework for physics beyond the standard model. It explains the stability of the electroweak scale against quadratically divergent radiative corrections. Furthermore, particle contents of the minimal SUSY standard model (MSSM) lead to a beautiful unification of the three gauge coupling constants of the standard model. One of the remarkable features in the MSSM is the existence of an ideal dark matter candidate, that is, the lightest SUSY particle (LSP). 1 The most extensively studied LSP as a dark matter candidate is the bino-like neutralino, since its thermal relic abundance naturally provides a desired amount of the present mass density of the dark matter. O

Year: 2001
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