The Z b b Excess and Top Decay
Ernest Ma, Daniel Ng
Abstract
The apparent excess of Z → b b events at LEP may be an indication of new physics beyond the standard model. However, in either the two-Higgs-doublet model or the minimal supersymmetric standard model, any explanation would lead to an important new decay mode of the top quark and suppresses the t → W b branching fraction, which goes against what has been observed at the Tevatron. In the two-Higgs-doublet model, the branching fraction of Z → b b + a light boson which decays predominantly into b b would be at least of order 10-4.
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