Abstract
We summarize calculations of backgrounds for cosmic ray candidates for new particles in emulsions. Even if only the strongest cosmic ray candidates are accepted as genuine, the implication is that their production cross sections would be relatively large at accelerator energies (≳1μb) and that decay modes with π0 appear to be prominent. We refer to current accelerator upper bounds on σ×BKπ for production of hadrons with M≳2 GeV and discuss the relation between these bounds and the cosmic ray events.
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