Tevatron Mass Limits for Heavy Quarks Decaying via Flavor Changing Neutral Current

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The dimuon and dielectron data from the Tevatron $\bar pp$ collider are used to probe for heavy quarks, which decay dominantly via flavour changing neutral current. Depending on whether the $FCNC$ decay occurs at the tree or loop level, one gets a lower mass limit of 85 or 75 GeV. The former applies to singlet, vector doublet and mirror type quarks while the latter applies to a lefthanded quark doublet of the fourth generation.
13 pages, TIFR/TH/92-58, Two figures to be supplied on request

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