II型双希格斯二重态模型中准稳真空的命运
Fate of Metastable Vacua in the Type-II Two-Higgs Doublet Model
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中文总结 AI 辅助
研究II型双希格斯二重态模型中标量势的多个极值及EW真空稳定性，通过贝叶斯全局拟合，结合幺正性约束和实验测量，得出导致准稳EW真空的参数空间区域在树图和一圈水平均被排除的结论。
中文摘要 AI 辅助
双希格斯二重态模型（2HDM）的标量势由于存在两个希格斯二重态，与标准模型（SM）不同，它可以容纳多个非简并真空。对于一个物理上可行的参数点，这些真空中必有一个对应于物理电弱（EW）对称破缺真空，其真空期望值约为246 GeV。鉴于标量势的复杂结构，物理EW真空可能本质上是准稳的，而非势的全局最小值。在这项工作中，我们描绘了II型2HDM中标量势具有多个极值的参数空间区域，并以规范无关的方式分析了那里EW真空在树图水平及更高阶的稳定性。对II型2HDM的贝叶斯全局拟合，包括次领头阶幺正性约束和最新实验测量，表明导致准稳EW真空的参数空间区域在树图和一圈水平都被排除。
英文摘要
The scalar potential of the Two-Higgs-Doublet Model (2HDM) can admit multiple non-degenerate vacua due to the presence of the two Higgs doublets unlike the Standard Model (SM). For a physically viable parameter point, one of these vacua must correspond to the physical electroweak (EW) symmetry breaking vacuum with the vacuum expectation value of about $246$ GeV. Given the complex structure of the scalar potential, the physical EW vacuum may be metastable in nature rather than the global minimum of the potential. In this work, we delineate regions of the parameter space in the Type-II 2HDM accommodating multiple extrema of the scalar potential and analyze, in a gauge-independent manner, the stability of the EW vacuum there at the tree level and beyond. A Bayesian global fit of the Type-II 2HDM, including next-to-leading-order unitarity constraints and the latest experimental measurements, indicates that parameter space regions leading to metastable EW vacua are excluded at both the tree and one-loop levels.
