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arXiv 2207.01465hep-ph
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Composite Higgs模型的电弱精确检验

Electroweak precision tests of composite Higgs models

Mads T. Frandsen, Martin Rosenlyst

AI总结:

研究具有费米子部分复合性的Composite Higgs模型在电弱精确测量(含CDF 2022 W质量)约束下的表现,发现其S、T参数与LEP及CDF测量界限相符。

摘要:

我们研究了来自电弱精确测量(包括CDF合作组2022年的W玻色子质量结果)对具有费米子部分复合性的Composite Higgs模型的约束。我们关注的模型中,Composite Higgs部分源于具有费米子的底层四维强相互作用规范理论,且标准模型(SM)费米子通过费米子与复合部分之间的线性混合项获得质量——即所谓的费米子部分复合性场景。通常,Composite Higgs部分导致一个较小且为正的S参数和一个负的T参数,但费米子部分复合性部分在大部分参数空间中导致整体为正的T参数。因此,我们发现完整的复合模型与LEP和CDF对S和T的当前电弱精确测量界限(包括S,T相对于SM预测的偏移和相关性)之间具有良好的一致性。

英文摘要:

We study constraints on Composite Higgs models with fermion partial compositeness from electroweak precision measurements, including the 2022 $W$-boson mass result from the CDF collaboration. We focus on models where the Composite Higgs sector arises from underlying four-dimensional strongly interacting gauge theories with fermions, and where the SM fermions obtain their mass via linear mixing terms between the fermions and the composite sector -- the so-called fermion partial compositeness scenario. In general, the Composite Higgs sector leads to a small and positive $S$ parameter, and a negative $T$ parameter, but the fermion partial compositeness sector results in an overall positive $T$ parameter in a large part of parameter space. We, therefore, find good agreement between the full composite models and the current electroweak precision measurement bounds on $S$ and $T$ from LEP and CDF, including the offset and correlation of $S,T$ with respect to the SM predictions.

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