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arXiv 2512.02111hep-ph
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评估从单个Higgs观测量确定三线性Higgs自耦合的不确定性

Assessing uncertainties in the determination of the trilinear Higgs self-coupling from single-Higgs observables

Institute for Theoretical Physics (ITP), Universit\"at Heidelberg, Philosophenweg 16, 69120 Heidelberg, Germany

Henning Bahl, Philip Bechtle, Johannes Braathen, Sven Heinemeyer, Jenny List, Murillo Vellasco, Georg Weiglein

AI总结:

通过环贡献和有效场论拟合评估三线性Higgs自耦合的不确定性,发现理论不确定性对确定$λ_{hhh}$的灵敏度有重要影响。

摘要:

环形$e^{+}e^{-}$对撞机在能量低于双Higgs产额阈值的情况下,可以通过其对单Higgs产额过程和电弱精密观测量的环贡献来提供关于三线性Higgs自耦合$λ_{hhh}$的信息。我们研究了如何通过其环贡献在全局有效场论拟合中间接确定非标准模型(non-SM)值的$λ_{hhh}$。以SM Higgs领域惰性双重扩展为例,我们发现与环贡献的处理和有效场论展开截断相关的理论不确定性,通常被忽略,但在全局拟合中对$λ_{hhh}$的灵敏度起着重要作用。不考虑这些额外不确定性所获得的间接确定$λ_{hhh}$的结果会过于乐观,导致$λ_{hhh}$的最终精度被人为提高。因此,这些结果可能在精确识别电弱对称破缺基本物理中产生误导。

英文摘要:

Circular $e^{+}e^{-}$ colliders operating at energies below the di-Higgs production threshold can provide information on the trilinear Higgs self-coupling $λ_{hhh}$ via its loop contributions to single Higgs production processes and electroweak precision observables. We investigate how well a non-SM value of $λ_{hhh}$ can be determined indirectly via its loop contributions within a global EFT fit. Using an inert doublet extension of the SM Higgs sector as an example for a scenario of physics beyond the SM that could be realised in nature, we find that theoretical uncertainties related to the treatment of loop contributions and the truncation of the EFT expansion, which are usually neglected, play an important role in determining the sensitivity to $λ_{hhh}$ in a global fit. The results obtained from such an indirect determination of $λ_{hhh}$ without taking these additional uncertainties into account would be too optimistic, leading to an artificially high resulting precision for $λ_{hhh}$. They could therefore be misleading in the quest to precisely identify the underlying physics of electroweak symmetry breaking.

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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