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arXiv 2407.09593hep-ph
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复合希格斯模型的非普适探针:新界限与FCC-ee的前景

Non-universal probes of composite Higgs models: New bounds and prospects for FCC-ee

Ben A. Stefanek

AI总结:

研究复合希格斯模型的非普适探针,通过SILH+TQ有效场论分析发现2圈效应增强约束,FCC-ee可探测至25 TeV能标并检验电弱尺度自然性。

摘要:

我们通过强相互作用轻希格斯和顶夸克(SILH+TQ)的有效场论,研究复合希格斯模型的领先圈级现象学。我们系统分析了SILH+TQ情景中树级生成算子的重整化群演化(RGE),发现味非普适算子大量混合进入影响电弱精确观测量的算子中。我们表明,这些与模型无关的RG贡献比有限匹配项的典型估计更为重要。味非普适效应完全通过考察顶夸克混合的三种选项来捕捉:完全复合的$q_L^3$、等复合性以及完全复合的$t_R$。在最具有现象学可行性的完全复合$t_R$情形中,我们表明对自然参数空间的最强约束来自4-top算子$O_{tt} = (\bar t_R γ_μt_R)(\bar t_R γ^μt_R)$对Peskin-Takeuchi $T$参数的2圈双对数贡献。总体而言,我们发现这一2圈效应使得现有的电弱精确数据能够对4-top算子给出比LHC顶夸克产生的高能探针更好的约束。独立于顶夸克混合,我们发现未来的太拉-$Z$机器如FCC-ee有潜力探测复合希格斯模型直至$m_* \gtrsim 25$ TeV的能标,并在$\lesssim 10^{-4}$的水平上检验电弱尺度的自然性。

英文摘要:

We study the leading loop-level phenomenology of composite Higgs models via the effective field theory of a strongly interacting light Higgs and top quark (SILH+TQ). We systematically analyze the renormalization group evolution (RGE) of tree-generated operators in the SILH+TQ scenario, finding large mixings of flavor non-universal operators into those affecting electroweak precision observables. We show that these model-independent RG contributions are more important than typical estimates for finite matching terms. Flavor non-universal effects are completely captured by examining three options for the top mixing: fully composite $q_L^3$, equal compositeness, and fully composite $t_R$. In the most phenomenologically viable case of a fully composite $t_R$, we show that the strongest bound on the natural parameter space comes from a 2-loop double-log contribution of the 4-top operator $O_{tt} = (\bar t_R γ_μt_R)(\bar t_R γ^μt_R)$ into the Peskin-Takeuchi $T$ parameter. In general, we find that this 2-loop effect allows existing electroweak precision data to give better constraints on 4-top operators than high-energy probes from top production at the LHC. Independent of the top mixing, we find that a future tera-$Z$ machine such as FCC-ee has the potential to probe composite Higgs models up to a scale of $m_* \gtrsim 25$ TeV, and test the naturalness of the electroweak scale at the $\lesssim 10^{-4}$ level.

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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