Abstract
Data from the 1988 and 1989 runs of the CERN pp̄ Collider have been analysed to look for charged current decays of the top quark. A lower limit of 67(70) GeV at the 95(90)% confidence level has been set for the top mass. A similar analysis for a light fourth generation quark (the b′) gives a lower limit of 53(56) GeV at the 95(90)% confidence level.
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