Alternative interpretation of the Fermilab Tevatron top events

[[abstract]]We propose an alternative interpretation of the top events discovered at the Fermilab Tevatron in 1995. Given that the charge of the b quark jet cannot be measured for the whole sample with certainty, the signal can be due to a quark of charge -4/3 at the reported mass, i.e., 174 GeV, while the top quark is actually heavier, say above 230 GeV. We point out in this paper that such a scenario is actually hinted at by the latest precision electroweak measurements of Z decay. To rule out this possibility in the future, the b quark jet charge analysis has to become definitive, or the single "top" production cross section has to be measured. [S0556-2821(99)50309-3].[[fileno]]2010133010016[[department]]物理