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

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

1995-04-24

arxiv.org/abs/hep-ph/9504369v1

Mod.Phys.Lett. A10 (1995) 967-972

Physics

High Energy Physics

High Energy Physics - Phenomenology

To appear in Mod. Phys. Lett. A, 10 Pages(LaTeX)+1 Figure (not included). The PS figure is available upon request from the aut

Scientific paper

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 \gamma decay 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 $\epsilon_b$. We find that the $\epsilon_b$ constraint excludes most of the less appealing window $\tan\beta\lsim 1$ at 95% C.L. for the measured top mass from CDF, mt=176+/- 8+/-10 GeV. Moreover, it excludes $\tan\beta\lsim 2$ at 95% C.L. for mt>176 GeV. Combining with the b->s \gamma constraint, only very heavy charged Higgs (>670 GeV) is allowed by the measured mt from CDF.

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