We present an up-to-date analysis of the constraints imposed bythe precision data on the (CP − conserving) Two-Higgs-Doublet Model of type II, with emphasis on the possible existence of very light neutral (pseudo)scalar Higgs boson with mass below 20-30 GeV. We show that even in the presence of such light particles, the 2HDM(II) can describe the electroweak data with precision comparable to that given by the SM. Particularly interesting lower limits on the mass of the lighter neutral CP −even scalar h 0 are obtained in the scenario with a light CP −odd Higgs boson A 0 and large tan β.
Constraints on the general 2HDM ("Model II") are obtained from the existing (g − 2) µ data including limits on Higgs bosons masses from LEP I data. We consider separately two cases: with a light scalar h and with a light pseudoscalar A, assuming M h + M A ≥ M Z . The charged Higgs contribution is also included. It is found that already the present (g − 2) µ data improve limits obtained recently by ALEPH collaboration on tan β for the mass of the pseudoscalar below < ∼ 2 GeV. The improvement in the accuracy by factor 20 in the forthcoming E821 experiment may lead to more stringent, than
We present an up-to-date analysis of the constraints imposed bythe precision data on the (CP − conserving) Two-Higgs-Doublet Model of type II, with emphasis on the possible existence of very light neutral (pseudo)scalar Higgs boson with mass below 20-30 GeV. We show that even in the presence of such light particles, the 2HDM(II) can describe the electroweak data with precision comparable to that given by the SM. Particularly interesting lower limits on the mass of the lighter neutral CP −even scalar h 0 are obtained in the scenario with a light CP −odd Higgs boson A 0 and large tan β.
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