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arXiv 2409.20198hep-ph
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有效标量势的正定性约束在Georgi-Machacek模型中

Positive definiteness constraints of effective scalar potential in Georgi-Machacek Model

Institute of Physics, Henan Academy of Sciences(中国科学院河南分院物理研究所);School of Physics, Henan Normal University(河南师范大学物理学院);School of Physics, Zhengzhou University(郑州大学物理学院)

Xiao Kang Du, Fei Wang

AI总结:

研究通过分析Georgi-Machacek模型的有效标量势正定性,修正了树级BFB约束下的参数范围,揭示了大场值区域的稳定性条件。

摘要:

Georgi-Machacek(GM)模型通过引入额外的三重态扩展了标准模型的希格斯部分,保持了树级的守护对称性,并允许高达约10 GeV量级的三重态真空期望值(VEVs)。对模型参数的理论约束包括树级标量势的有下界(BFB)条件。本研究超越了BFB约束,通过考察GM模型的有效势的正定性,以确保在大场值区域不存在更深层的真空。使用一阶重整化群改进(RG改进)的有效势和新的多项式正定性标准(由于环效应导致守护对称性破坏,因此必要),我们对这些约束进行了数值分析。我们的结果表明,正定性允许的参数范围与树级BFB条件得出的范围有显著差异。值得注意的是,一些此前被树级BFB约束排除的区域在考虑一阶RG改进标量势时仍然可行。此外,某些满足树级BFB约束的参数空间由于在大场值区域违反正定性,应被排除。基于新的多项式正定性标准的数值分析,不仅修订了GM模型的可行性地图,还为其他扩展的希格斯模型的稳定性研究提供了方法论模板。

英文摘要:

The Georgi-Machacek (GM) Model extends the Higgs sector of the Standard Model by introducing additional triplets, preserving custodial symmetry at tree level and allowing large triplet vacuum expectation values (VEVs) of order $\cal{O}$(10) GeV. Theoretical constraints on the model's parameters include bounded-from-below (BFB) conditions for the tree-level scalar potential. This study goes beyond the BFB constraints by examining the positive definiteness of the effective potential in the GM model to ensure the absence of deeper vacua in regions with large field values. Using a one-loop renormalization group-improved (RG-improved) effective potential and new criteria for positive definiteness of homogeneous polynomials with multiple variables (necessary due to custodial symmetry breaking effects from loops), we numerically analyze these constraints. Our results reveal that the parameter ranges allowed by positive definiteness differ significantly from those derived from tree-level BFB conditions. Notably, some regions previously excluded by tree-level BFB constraints remain viable under the one-loop RG-improved scalar potential. Besides, certain parameter spaces that satisfy tree-level BFB constraints with electroweak (EW) scale couplings should be excluded due to violations of positive definiteness in large field-value regions. Our numerical analysis, based on the new criteria for positive definiteness of homogeneous polynomials with multiple variables, not only revises the GM model's viability map but also provides a methodological template for stability studies in other extended Higgs models.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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