Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1853410 | Physics Letters B | 2010 | 8 Pages |
Abstract
We suppose that the lightest supersymmetric particle (LSP) in the minimal supersymmetric standard model (MSSM) is the dark matter. The bino-like LSP can decay through the SO(10) gauge interactions, if one right-handed (RH) neutrino (ν1c) is lighter than the LSP and its superpartner (νË1c) develops a vacuum expectation value (VEV), raising extremely small R-parity violation naturally. The leptonic decay modes can be dominant, if the VEV scale of 16H is a few orders of magnitude lower than the VEV of 45H (â1016GeV), and if a slepton (eË1c) is relatively lighter than squarks. The desired decay rate of the LSP, ÎÏâ¼10â26sâ1 to explain PAMELA data can be naturally achieved, because the gaugino mediating the LSP decay is superheavy. From PAMELA data, the SU(3)cÃSU(2)LÃSU(2)RÃU(1)BâL breaking scale (or the 16H VEV scale) can be determined. A global symmetry is necessary to suppress the Yukawa couplings between one RH (s)neutrino and the MSSM fields. Even if one RH neutrino is quite light, the seesaw mechanism providing the extremely light three physical neutrinos and their oscillations is still at work.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Nuclear and High Energy Physics
Authors
Bumseok Kyae,