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arXiv 2109.02884hep-phhep-ex
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扩展Higgs模型中电子-正电子碰撞对Higgs辐射过程的次引导阶修正

Next-to-leading-order corrections to the Higgs strahlung process from electron-positron collisions in extended Higgs models

Masashi Aiko, Shinya Kanemura, Kentarou Mawatari

摘要:

我们给出了在各种扩展的Higgs模型中,如Higgs单重态模型(HSM),惰性二重态模型(IDM)和双Higgs二重态模型(2 HDM)中,电子和$Z$玻色子在次领先阶下任意极化的$e^{+}e^{-}\to hZ$的截面.我们系统地对在壳层重整化方案中的螺旋度振幅进行了完整的单圈计算,给出了完整的解析结果和数值计算。综合分析了总截面$ΔR^{hZ}$与标准模型(SM)预测值的偏差,并详细讨论了各模型之间的差异。我们发现在重整化的$hZZ$顶点出现的新的物理效应几乎支配着$ΔR^{hZ}$的行为,并且在大多数情况下它取负值。$ΔR^{hZ}$的可能尺寸在理论和实验范围内达到百分之几。我们还利用$\texttt{H-COUP}$程序分析了已发现的希格斯玻色子的总截面乘以衰变分支比的偏差$ΔR^{hZ}_{XY}$。通过分析$ΔR^{hZ}_{ττ}$和$ΔR^{hZ}_{bb}$之间以及$ΔR^{hZ}_{ττ}$和$ΔR^{hZ}_{cc}$之间的相关性,发现这四种类型的2 HDMs可以区分。此外,通过测量$ΔR^{hZ}_{WW}$,可以将HSM和IDM与2 HDM区分开。这些特征可以在未来的希格斯工厂(如国际线性对撞机)通过精确测量进行测试。

英文摘要:

We present the cross section for $e^{+}e^{-}\to hZ$ with arbitrary sets of electron and $Z$ boson polarizations at the full next-to-leading order in various extended Higgs models, such as the Higgs singlet model (HSM), the inert doublet model (IDM) and the two Higgs doublet model (2HDM). We systematically perform complete one-loop calculations to the helicity amplitudes in the on-shell renormalization scheme, and present the full analytic results as well as numerical evaluations. The deviation $ΔR^{hZ}$ in the total cross section from its standard model (SM) prediction is comprehensively analyzed, and the differences among these models are discussed in details. We find that new physics effects appearing in the renormalized $hZZ$ vertex almost govern the behavior of $ΔR^{hZ}$, and it takes a negative value in most cases. The possible size of $ΔR^{hZ}$ reaches several percent under the theoretical and experimental bounds. We also analyze the deviation $ΔR^{hZ}_{XY}$ in the total cross section times decay branching ratios of the discovered Higgs boson by utilizing the $\texttt{H-COUP}$ program. It is found that the four types of 2HDMs can be discriminated by analyzing the correlation between $ΔR^{hZ}_{ττ}$ and $ΔR^{hZ}_{bb}$ and those between $ΔR^{hZ}_{ττ}$ and $ΔR^{hZ}_{cc}$. Furthermore, the HSM and the IDM can be discriminated from the 2HDMs by measuring $ΔR^{hZ}_{WW}$. These signatures can be tested by precision measurements at future Higgs factories such as the International Linear Collider.

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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