$b \rightarrow s γ$ and $Z \rightarrow b \overline b$ Constraints on Two Higgs Doublet Model

Details $b \rightarrow s γ$ and $Z \rightarrow b \overline b$ Constraints on Two Higgs Doublet Model $b \rightarrow s γ$ and $Z \rightarrow b \overline b$ Constraints on Two Higgs Doublet Model

1993-09-08

arxiv.org/abs/hep-ph/9309241v1

Phys.Rev. D50 (1994) 599-601

Physics

High Energy Physics

High Energy Physics - Phenomenology

LATEX, 6 Pages, 2 Figures available upon request, CTP-TAMU-54/93, ACT-21/93

Scientific paper

10.1103/PhysRevD.50.599

We perform a combined analysis of two stringent constraints on two Higgs doublet model, coming from the recently announced CLEO II bound on $B(b \rightarrow s \gamma)$ and $Z \rightarrow b \overline b$ and from the recent LEP data on the ratio $\Gamma(Z\rightarrow b\overline b)\over{\Gamma(Z\rightarrow hadrons)}$. We include one-loop vertex corrections to $Z \rightarrow b \overline b$ in the model. We find that although the CLEO II bound serves as the strongest constraint present in the charged Higgs sector of the model, the current LEP value for $R_b$ may also provide a further constraint for $\tan\beta<1$.

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