Long-lived superheavy particles in dynamical supersymmetry-breaking models in supergravity

  title={Long-lived superheavy particles in dynamical supersymmetry-breaking models in supergravity},
  author={Koichi Hamaguchi and Ken-Ichi Izawa and Yasunori Nomura and Tsutomu. T. Yanagida},
  journal={Physical Review D},
Superheavy particles of masses $\simeq 10^{13}-10^{14} GeV$ with lifetimes $\simeq 10^{10}-10^{22} years$ are very interesting, since their decays may account for the ultra-high energy (UHE) cosmic rays discovered beyond the Greisen-Zatsepin-Kuzmin cut-off energy $E \sim 5 \times 10^{10} GeV$. We show that the presence of such long-lived superheavy particles is a generic prediction of QCD-like SU(N_c) gauge theories with N_f flavors of quarks and antiquarks and the large number of colors N_c… 
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