We investigate the possibility that cosmic rays of energy larger than the Greisen-Zatsepin-Kuzmin cutoff are not nucleons, but a new stable, massive, hadron that appears in many extensions of the standard model. We focus primarily on the S⁰, a uds-gluino bound state. The range of the S⁰ through the cosmic background radiation is significantly longer than the range of nucleons, and therefore S⁰'s can originate from sources at cosmological distances.
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Chung et al. (1998) studied this question.
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