Mass bounds of the lightest CP-even Higgs boson in the two-Higgs-doublet model

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dc.creatorKanemura, Shinya
dc.creatorKasai, Takashi
dc.creatorOkada, Yasuhiro
dc.date1999-03-08
dc.date1999-11-11
dc.date.accessioned2026-07-07T04:06:35Z
dc.date.available2026-07-07T04:06:35Z
dc.descriptionThe upper and the lower bounds of the lightest CP-even Higgs-boson mass ($m_h$) are discussed in the two-Higgs-doublet model (2HDM) with a softly-broken discrete symmetry. They are obtained as a function of a cut-off scale $Λ$ ($\leq 10^{19}$ GeV) by imposing the conditions in which the running coupling constants neither blow up nor fall down below $Λ$. In comparison with the standard model (SM), although the upper bound does not change very much, the lower bound is considerably reduced. In the decoupling regime where only one Higgs boson ($h$) becomes much lighter than the others, the lower bound is given, for example, by about 100 GeV for $Λ= 10^{19}$ GeV and $m_t = 175$ GeV, which is smaller by about 40 GeV than the corresponding lower bound in the SM. In generic cases, $m_h$ is no longer bounded from below by these conditions. If we consider the $b \to s γ$ constraint, small values of $m_h$ are excluded in Model II of the 2HDM.
dc.description13 pages, 5 figures, extend the analysis to the case without restriction among self-coupling constants. Conclusions unchanged. To appear in Phys. Lett. B
dc.identifierhttps://arxiv.org/abs/hep-ph/9903289
dc.identifierhttp://arxiv.org/abs/hep-ph/9903289
dc.identifierPhys.Lett. B471 (1999) 182-190
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/48824
dc.subjectHigh Energy Physics - Phenomenology
dc.titleMass bounds of the lightest CP-even Higgs boson in the two-Higgs-doublet model
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