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arXiv 1409.3199hep-ph
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极限双Higgs二重态模型

Limiting two-Higgs-doublet models

Alessandro Broggio, Eung Jin Chun, Massimo Passera, Ketan M. Patel, Sudhir K. Vempati

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18 pages, 3 figures
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摘要：

我们更新的约束两希格斯偶极子模型（2 HDMs），专注于相关的参数空间来解释目前的μ子$g$ $-$ $2$异常，$Δa_μ$，在四种不同类型的模型，I型，II型，“轻子特定”（或X）和“翻转”（或Y）。结果表明，在带电标量与重中性标量简并且混合角$α$和$β$满足标准模型极限$β-α\approx π/2$的区域，可以避开由电弱精确数据提供的对赝标量Higgs质量的强约束.我们结合了真空稳定性和微扰性的理论约束与对撞机和$B$ ~物理产生的直接和间接的界限。还考虑了来自电子$g$ $-$ $2$的可能的未来约束。如果将LHC发现的126 GeV共振解释为2 HDM的轻CP偶希格斯玻色子玻色子，我们发现只有X型模型才能满足所有考虑的理论和实验约束。

英文摘要：

We update the constraints on two-Higgs-doublet models (2HDMs) focusing on the parameter space relevant to explain the present muon $g$$-$$2$ anomaly, $Δa_μ$, in four different types of models, type I, II, "lepton specific" (or X) and "flipped" (or Y). We show that the strong constraints provided by the electroweak precision data on the mass of the pseudoscalar Higgs, whose contribution may account for $Δa_μ$, are evaded in regions where the charged scalar is degenerate with the heavy neutral one and the mixing angles $α$ and $β$ satisfy the Standard Model limit $β-α\approx π/2$. We combine theoretical constraints from vacuum stability and perturbativity with direct and indirect bounds arising from collider and $B$~physics. Possible future constraints from the electron $g$$-$$2$ are also considered. If the 126 GeV resonance discovered at the LHC is interpreted as the light CP-even Higgs boson of the 2HDM, we find that only models of type X can satisfy all the considered theoretical and experimental constraints.

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