Superheavy Dark Matter with Discrete Gauge Symmetries

Details Superheavy Dark Matter with Discrete Gauge Symmetries Superheavy Dark Matter with Discrete Gauge Symmetries

1998-05-18

arxiv.org/abs/hep-ph/9805346v1

Phys.Rev.D58:103503,1998

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, Latex

Scientific paper

10.1103/PhysRevD.58.103503

We show that there are discrete gauge symmetries protect naturally heavy X particles from decaying into the ordinary light particles in the supersymmetric standard model. This makes the proposal very attractive that the superheavy X particles constitute a part of the dark matter in the present universe. It is more interesting that there are a class of discrete gauge symmetries which naturally accommodate a long-lived unstable X particle. We find that in some discrete Z_{10} models, for example, a superheavy X particle has lifetime \tau_X \simeq 10^{11}-10^{26} years for its mass M_X \simeq 10^{13}-10^{14} GeV. This long lifetime is guaranteed by the absence of lower dimensional operators (of light particles) couple to the X. We briefly discuss a possible explanation for the recently observed ultra-high-energy cosmic ray events by the decay of this unstable X particle.

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