B→sγ AND εb CONSTRAINTS ON TWO-HIGGS DOUBLET MODEL

Abstract

Listen

Translate article

We perform a combined analysis of two stringent constraints on the two-Higgs doublet model, one coming from the recently announced CLEO II bound on B (b→sγ) and the other from the recent LEP data on εb. We have included one-loop vertex corrections to [Formula: see text] through εb in the model. We find that the new εb constraint excludes most of the less appealing window tan β≲1 at 90% C.L. for mt=150 GeV. We also find that although b→sγ constraint is stronger for tan β>1, εb constraint is stronger for tan β≲1, and therefore these two are the strongest and complimentary constraints present in the charged Higgs sector of the model.