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arXiv 2109.04426hep-ph
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希格斯粒子衰变为轻子对和光子:$\mathbf{H\to Zγ}$发现和新物理探测的路线图

Higgs decay into a lepton pair and a photon: a roadmap to $\mathbf{H\to Zγ}$ discovery and probes of new physics

Aliaksei Kachanovich, Ulrich Nierste, Ivan Nišandžić

摘要:

衰减$H\to \ell^+\ell^- γ$,$\ell=e,μ$,接收来自$H\to Z[\to \ell^+\ell^-] γ$的贡献和非共振贡献,这两者都是回路诱导的。我们描述了如何可以分开这些子过程中的规范独立的方式,定义的衰减率$Γ(H\to Zγ)$,并提取后者从差分$H\to \ell^+\ell^- γ$分支比。对于$\ell=μ$,由μ子汤川耦合驱动的树衰变率也很重要。我们提出了优化的运动学切割,以分离三个贡献,铺平了道路的里程碑(一)发现$H\to Z γ$,(二)发现$H\to μ^+μ^- \left. γ\right|_{\rm tree}$,和(三)量化的新物理在有效的$H$ - $Z$ - $γ$和非共振$H$ - $\ell^+$ - $\ell^-$ - $γ$耦合。

英文摘要:

The decay $H\to \ell^+\ell^- γ$, $\ell=e,μ$, receives contributions from $H\to Z[\to \ell^+\ell^-] γ$ and a non-resonant contribution, both of which are loop-induced. We describe how one can separate these sub-processes in a gauge-independent way, define the decay rate $Γ(H\to Zγ)$, and extract the latter from differential $H\to \ell^+\ell^- γ$ branching ratios. For $\ell=μ$ also the tree decay rate, which is driven by the muon Yukawa coupling, is important. We propose kinematic cuts optimized to separate the three contributions, paving the way to the milestones (i) discovery of $H\to Z γ$, (ii) discovery of $H\to μ^+μ^- \left. γ\right|_{\rm tree}$, and (iii) quantification of new physics in both the effective $H$-$Z$-$γ$ and non-resonant $H$-$\ell^+$-$\ell^-$-$γ$ couplings.

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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