用III型反跷跷板考察IDM的真空稳定性
Scrutinizing Vacuum Stability in IDM with Type-III Inverse seesaw
摘要：
我们考虑了标准模型的扩展，其中包含一个惰性的Higgs双重态，也包含两组或三组超荷为零的$SU(2)_L$三重态费米子，并分析了电弱真空的稳定性。该模型描述了一种由暗物质产生中微子质量的III型反跷跷板机制，并采用双圈β函数的有效势方法计算了电弱真空的命运.与标准模型相比，弱规范耦合$g_2$表现出不同的行为。修改运行的$g_2$，随着希格斯四次耦合和III型汤川耦合成为决定电弱真空的稳定性至关重要。这种三重态费米子的两代和三代之间的相互作用表明，如果我们追求普朗克尺度的稳定性，那么两代费米子的扩展是有利的。给出了不同质量标度的III型费米子的Higgs四次耦合、III型Yukawa耦合和三重态费米子生成数的界。在LHC和其他实验中的惰性双重态和III型费米子的现象进行了评论。
英文摘要：
We consider the extension of the Standard Model (SM) with an inert Higgs doublet that also contains two or three sets of $SU(2)_L$ triplet fermions with hypercharge zero and analyze the stability of electroweak vacuum for the scenarios. The model represents a Type-III inverse seesaw mechanism for neutrino mass generation with a Dark matter candidate.An effective potential approach calculation with two-loop beta function have been carried out in deciding the fate of the electroweak vacuum. Weak gauge coupling $g_2$ shows a different behaviour as compared to the Standard Model. The modified running of $g_2$, along with the Higgs quartic coupling and Type-III Yukawa couplings become crucial in determining the stability of electroweak vacuum. The interplay between two and three generations of such triplet fermions reveals that extensions with two generations is favoured if we aspire for Planck scale stability. Bounds on the Higgs quartic couplings, Type-III Yukawa and number of triplet fermion generations are drawn for different mass scale of Type-III fermions. The phenomenologies of inert doublet and Type-III fermions at the LHC and other experiments are commented upon.
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