论文标题
在2HDM中进行微调
Fine-Tuning in the 2HDM
论文作者
论文摘要
两型双打模型（2HDM）是希格斯行业最受欢迎和最自然的扩展之一。但是，它有两个潜在的微调问题，与electroweak（EW）的破裂以及与SM Higgs玻色子的对齐要求有关。我们已经根据最初的2HDM参数和物理（质量，混合角等）来量化获得分析表达式的微调。我们还提供简单的近似表达式。我们已经考虑到微调不是独立的，并通过将对齐方式的变化投影到常数-U {\ rm v}^2 $ hypersurface上，从而删除了“双重计数”。 EW和对齐微调在参数空间的不同，甚至相反的区域都变得严重，即分别在大小的额外质量的质量中。出现一个中间区域，$ 500 \ {\ rm gev} \ leq \ {m_h，m_a，m_a，m_ {h^\ pm} \ pm} \ leq 700 \ {\ rm gev} $，在两者都可以接受的地方很小。我们还讨论了一个显着的趋势，乍一看并不明显。也就是说，对于大$ \tanβ$，EW和对齐微调都会减轻。结果，即使$ \tanβ\ geq {\ cal o}（10）$，即使$ m_h，m_a，m_a，m_ {h^\ pm} $也很自然，也很自然。我们解释了为什么由超对称性造成的2HDM并非如此。我们已经通过数字分析几种代表性方案来说明所有这些趋势。
The Two-Higgs Doublet Model (2HDM) is one of the most popular and natural extensions of the Higgs sector; but it has two potential fine-tuning problems, related to the electroweak (EW) breaking and the requirement of alignment with the SM Higgs boson. We have quantified the fine-tunings obtaining analytical expressions, both in terms of the initial 2HDM parameters and the physical ones (masses, mixing angles, etc.). We also provide simple approximate expressions. We have taken into account that the fine-tunings are not independent and removed the "double counting" by projecting the variations of the alignment onto the constant-${\rm v}^2$ hypersurface. The EW and the alignment fine-tunings become severe in different, even opposite, regions of the parameter space, namely in the regimes of large and small extra-Higgs masses, respectively; emerging an intermediate region, $500\ {\rm GeV} \leq \{m_H, m_A, m_{H^\pm}\} \leq 700\ {\rm GeV}$, where both are acceptably small. We also discuss a remarkable trend that is not obvious at first glance. Namely, for large $\tanβ$ both the EW and the alignment fine-tunings become mitigated. In consequence, the 2HDM becomes quite natural for $\tanβ\geq {\cal O} (10)$, even if $m_H, m_A, m_{H^\pm}$ are as large as 1500 GeV. We explain why this is not the case for the 2HDM stemming from supersymmetry. We have illustrated all these trends by numerically analyzing several representative scenarios.
