Phys. Rev. D 53, 255–260 (1996)Z→bb¯ excess and top quark decayReceived 21 August 1995; published in the issue dated 1 January 1996 The apparent excess of Z→bb¯ events at CERN 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→Wb branching fraction, which goes against what has been observed at the Fermilab Tevatron. In the two-Higgs-doublet model, the branching fraction of Z→bb¯+a light boson which decays predominantly into bb¯ would be at least of order 10-4. © 1995 The American Physical Society. © 1996 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.53.255
DOI:
10.1103/PhysRevD.53.255
PACS:
13.38.Dg, 12.60.Jv, 14.65.Ha, 14.70.Hp
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