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Implications of the Recent Top Quark Discovery on Two Higgs Doublet Model

Gye T. Park
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Abstract

Concentrating on the impact of the very recent top quark discovery, we perform a combined analysis of two strongest constraints on the 2 Higgs doublet model, one coming from the recent measurement by CLEO on the inclusive branching ratio of b->s γdecay and the other from the recent LEP data on Z->b b-bar decay. We have included the model predictions for one-loop vertex corrections to Z->b b-bar through $ε_b$. We find that the $ε_b$ constraint excludes most of the less appealing window $\tanβ\lsim 1$ at 95% C.L. for the measured top mass from CDF, mt=176+/- 8+/-10 GeV. Moreover, it excludes $\tanβ\lsim 2$ at 95% C.L. for mt>176 GeV. Combining with the b->s γconstraint, only very heavy charged Higgs (>670 GeV) is allowed by the measured mt from CDF.

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Gye T. Park. 1995-04-24. Implications of the Recent Top Quark Discovery on Two Higgs Doublet Model. https://doi.org/10.1142/s021773239500106x

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