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arXiv 1702.01737hep-ph
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三线性Higgs自耦合的精确观测约束

Constraints on the trilinear Higgs self coupling from precision observables

Giuseppe Degrassi, Marco Fedele, Pier Paolo Giardino

摘要:

我们提出的三线性希格斯自耦合的约束所产生的回路效应的$W$玻色子质量和有效的正弦预测。我们计算的贡献,这些精确的观测值的双环图具有异常三线性希格斯自耦合。我们明确地表明,如果在一个理论中进行对$m_{ \scriptscriptstyle W}$和$\mbox{$ \sin^2 θ^{ \rm lep}_{ \rm eff} $}$的分析,发现同样的反常贡献,在该理论中,标准模型拉格朗日中的标量势被一个(不)有限的$(Φ^\dagger Φ)^n$项和$Φ$希格斯偶极子塔修正。我们发现,三线性希格斯自耦合从精密可观的边界是竞争力与那些来自希格斯对生产。

英文摘要:

We present the constraints on the trilinear Higgs self coupling that arise from loop effects in the $W$ boson mass and the effective sine predictions. We compute the contributions to these precision observables of two-loop diagrams featuring an anomalous trilinear Higgs self coupling. We explicitly show that the same anomalous contributions are found if the analysis of $m_{ \scriptscriptstyle W}$ and $\mbox{$\sin^2 θ^{\rm lep}_{\rm eff}$}$ is performed in a theory in which the scalar potential in the Standard Model Lagrangian is modified by an (in)finite tower of $(Φ^\dagger Φ)^n$ terms with $Φ$ the Higgs doublet. We find that the bounds on the trilinear Higgs self coupling from precision observables are competitive with those coming from Higgs pair production.

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