Fitting Precision Electroweak Data with Exotic Heavy Quarks

Abstract

The 1999 precision electroweak data from LEP and SLC persist in showing some slight discrepancies from the assumed standard model, mostly regarding $b$ and $c$ quarks. We show how their mixing with exotic heavy quarks could result in a more consistent fit of all the data, including two unconventional interpretations of the top quark.

Comments: 7 pages, no figure, 2 typos corrected, 1 reference updated