Implications for new particle searches of some cosmic ray emulsion events

Calculations of backgrounds for cosmic ray candidates for new particles in emulsions are summarized. 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 (approximately greater than 1 μb) and that decay modes with π0 appear to be prominent. Current accelerator upper bounds on sigma x B/sub Kπ/ for production of hadrons with M greater than 2 GeV are considered and the relation between these bounds and the cosmic ray events is discussed