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arXiv 2107.04858hep-ph
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NLO 精度下希格斯玻色子衰变至费米子对与极化 $Z$ 玻色子

Higgs boson decays to a fermion pair and a polarized $Z$ boson at NLO accuracy

Zi-Qiang Chen, Qi-Ming Feng, Cong-Feng Qiao

AI总结:

该研究在单极点近似下计算含极化 $Z$ 的 $H\ o f\ar{f}μ^-μ^+$ 衰变 NLO 修正,量化其大小并提出提取伪可观测量的方法。

摘要:

本文在次领头阶(NLO)精度下研究希格斯玻色子衰变过程 $H\ o f\ar{f}Z\ o f\ar{f}μ^-μ^+$,其中 $f$ 表示任意轻费米子。计算在单极点近似框架内进行,并在该框架中分别考虑 $Z$ 玻色子不同偏振态的贡献。数值结果表明,通过采用适当的截断,非共振背景可忽略不计,且 NLO 修正为 LO 贡献的 $1\%$--$4\%$。我们还发现,纳入 NLO 修正可大幅降低对电弱耦合方案的依赖,并提高预测的可靠性。我们构建了一种从 $f\ar{f}μ^-μ^+$ 信号中提取伪可观测量 $Γ^{H\ o ffZ}$ 的方法。

英文摘要:

In this paper, we investigate the Higgs boson decay process $H\to f\bar{f}Z\to f\bar{f}μ^-μ^+$, where $f$ denotes any light fermions, at the next-to-leading order (NLO) accuracy. The calculation is performed within the framework of single-pole approximation, in which the contributions of different polarization states of the $Z$ boson are considered separately. Numerical results show that, by taking appropriate cut, the non-resonant background is negligible, and the NLO corrections are $1\%$--$4\%$ of the LO contributions. We also find that the inclusion of NLO corrections can greatly reduce the dependence on the electroweak coupling scheme, and enhance the prediction reliability. We formulate a method for the extraction of the pseudo-observable $Γ^{H\to ffZ}$ from the $f\bar{f}μ^-μ^+$ signal.

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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