Constraints on exotic particles from Tevatron missing transverse momentum data

The search at the Tevatron for events with large missing transverse momentum (PT), which set mass bounds exceeding 73 GeV for both squarks and gluinos, implies significantly improved mass limits on other exotic particles. We study various sources for PT events: production of leptoquarks or their fermionic partners in E6 models, Majorana leptogluons in composite models of quarks and leptons, and cosmions in a model which explains the solar neutrino and dark matter problems. The CDF data can already exclude neutral leptogluons with masses below 110 GeV, while an integrated luminosity of order 2 pb-1 would set lower mass bounds of order 100 GeV for the other exotic particles. (orig.)