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- W2005854645 abstract "The recently observed ultra-high energy (UHE) cosmic rays beyond the Greisen-Zatsepin-Kuzmin bound can be explained by the decays of some superheavy $X$ particles forming a part of dark matter in our universe. We consider various discrete gauge symmetries ${bf Z}_N$ to ensure the required long lifetime ($tau_X simeq 10^{10}-10^{22} years$) of the $X$ particle to explain the UHE cosmic rays in the minimal supersymmetric standard model (MSSM) with massive Majorana neutrinos. We show that there is no anomaly-free discrete gauge symmetry to make the lifetime of the $X$ particle sufficiently long in the MSSM with the $X$ particle. We find, however, possible solutions to this problem especially by enlarging the particle contents in the MSSM. We show a number of solutions introducing an extra pair of singlets $Y$ and $bar{Y}$ which have fractional ${bf Z}_N$ (N=2,3) charges. The present experimental constraints on the $X$ particle are briefly discussed." @default.
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- W2005854645 date "1999-02-17" @default.
- W2005854645 modified "2023-10-03" @default.
- W2005854645 title "Long lived superheavy dark matter with discrete gauge symmetries" @default.
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- W2005854645 doi "https://doi.org/10.1103/physrevd.59.063507" @default.
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