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arXiv 1812.02597hep-ph
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2 HDM在希格斯工厂的签名

Signature of 2HDM at Higgs Factories

Wenhai Xie, R. Benbrik, Abdeljalil Habjia, Souad Taj, Bin Gong, Qi-Shu Yan

摘要:

本文给出了在Higgs工厂中对双Higgs二重态模型(2 HDM)中过程$e^+ e^- \to Z ϕ$($ϕ=h^0,H^0$)的单圈全修正,包括弱修正和QED修正。直到$O(α_{em})$级别,通过使用FeynArts/FormCalc软件包来评估虚拟校正。利用费曼图计算(FDC)软件包计算了实际发射修正,并利用电子的结构函数对共线发散进行了正则化,分别利用FeynArts/FormCalc和FDC软件包研究了标准模型(SM)和2 HDM中的实际发射修正。规范的依赖性所产生的归一化混合角被删除,通过使用捏技术。在考虑到实验的限制,从目前的大型强子对撞机的数据,我们提出了四个有趣的基准方案,为未来的对撞机。通过使用这些基准场景,我们评估了$Δσ(e^+ e^- \to Z ϕ)$与它们的SM值的偏差。我们还研究了希格斯玻色子衰变$ϕ\to b\bar{b}$和$ϕ\to τ^+τ^-$,这可以有很大的电弱(EW)的贡献,从三重希格斯耦合,这是不存在的SM。结果发现,对于这些基准方案,EW和实际的排放修正是相当大的,可以测量在未来的$e^+ e^-$对撞机,如ILC,CLIC,和CEPC。

英文摘要:

The full one-loop corrections, both the weak and QED corrections, to the process $e^+ e^- \to Z ϕ$ ($ϕ=h^0,H^0$) in the two Higgs doublet model (2HDM) at the Higgs factories are presented. Up to the $O(α_{em})$ level, the virtual corrections are evaluated by using the FeynArts/FormCalc packages. The real emission corrections are computed using the Feynman Diagram Calculation (FDC) package and the collinear divergences are regularized by the structure functions of an electron. Using the FeynArts/FormCalc and the FDC packages, we study the corrections in the Standard Model (SM) and the 2HDM, respectively. Gauge dependence arising in the normalization of mixing angles is removed by using the pinch technique. After taking into account experimental constraints from the current LHC data, we propose four interesting benchmark scenarios for future colliders. By using these benchmark scenarios, we evaluate the deviation of $Δσ(e^+ e^- \to Z ϕ)$ from their SM values. We also examine Higgs boson decays $ϕ\to b\bar{b}$ and $ϕ\to τ^+τ^-$, which can have large electroweak (EW) contributions from triple Higgs couplings which are absent in the SM. It is found that for these benchmark scenarios, both EW and real emission corrections are sizeable and could be measured at a future $e^+ e^-$ colliders such as the ILC, CLIC, and CEPC.

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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