1999/03/31 by K. Hamaguchi, Koichi Hamaguchi, K. -I. Izawa +3 · 2 citations
Physics and Astronomy · #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Hidden sector #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum chromodynamics #Quark #Supergravity #Supersymmetry #astro-ph #hep-ph
paper · pdf · doi:10.1103/physrevd.60.125009
published as Phys.Rev.D60:125009,1999 · 13 pages, Latex
arxiv created 1999/08/24 · openalex publication_date 1999/11/16 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Superheavy particles of mass \ensuremath≃1013--1014 GeV with a lifetime \ensuremath≃1010--1022 yr are very interesting, since their decays may account for the ultrahigh energy (UHE) cosmic rays discovered beyond the Greisen-Zatsepin-Kuzmin cutoff energy E\ensuremath∼5\ifmmode×\else\texttimes\fi1010 GeV. We show that the presence of such long-lived superheavy particles is a generic prediction of QCD-like SU(Nc) gauge theories with Nf flavors of quarks and antiquarks and a large number of colors Nc. We construct explicit models based on supersymmetric SU(Nc) gauge theories and show that if the dynamical scale \ensuremathΛ\ensuremath≃1013--1014 GeV and Nc=6--10 the lightest composite baryons have the desired masses and lifetimes to explain the UHE cosmic rays. It is interesting that in these models the gaugino condensation necessarily occurs and hence these models may play the role of the so-called hidden sector for supersymmetry breaking in supergravity.