Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-04-14
Astropart.Phys.9:297-309,1998
Physics
High Energy Physics
High Energy Physics - Phenomenology
25 pages (Revtex) incl. 10 figures (epsf); Minor changes to reflect version accepted for publication
Scientific paper
10.1016/S0927-6505(98)00028-0
The expected proton and neutrino fluxes from decays of massive metastable relic particles is calculated using the HERWIG QCD event generator. The predicted proton spectrum can account for the observed flux of extremely high energy cosmic rays beyond the Greisen-Zatsepin-Kuzmin cutoff, for a decaying particle mass of O(10^{12}) GeV. The lifetime required is of O(10^{20}) yr if such particles constitute all of the dark matter (with a proportionally shorter lifetime for a smaller contribution). Such values are plausible if the metastable particles are hadron-like bound states from the hidden sector of supersymmetry breaking which decay through non-renormalizable interactions. The expected ratio of the proton to neutrino flux is given as a diagonistic of the decaying particle model for the forthcoming Pierre Auger project.
Birkel Michael
Sarkar Subir
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