Abstract
Prompted by the aspon model of Frampton and Kephart, we investigate the current limits on the mass of new vectorlike quarks and the prospects for their discovery at future accelerators. Events in which four leptons are produced provide the strongest constraints. Fermilab data enables us to rule out masses below about 90 GeV whilst at Superconducting Super Collider energies, a heavy quark, if it had properties of the kind we consider, would be discovered.
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