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arXiv 1406.7102hep-ph
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关于Higgs衰变为$Z$玻色子和$J/Ψ(Υ)$的注记

A note on Higgs decays into $Z$ boson and $J/Ψ(Υ)$

Dao-Neng Gao

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6 pages, 2 figures
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摘要：

我们分析了稀有衰变$h\to Z V$，其中$V$表示窄的$c\bar{c}$或$b\bar{b}$共振态，如$J/Ψ$或$Υ$态。在标准模型中，这些通道可以通过具有虚拟$Z^*\to V$的树级转换$h\to ZZ^*$以及循环诱导过程$h\to Zγ^*$，然后是$γ^*\to V$。结果表明，对于底偶素末态，环诱导过程产生的$h\to Z Υ$衰变率很小，前者的跃迁贡献最大;而对于粲偶素末态，由$h\to Zγ^* \to Z V$诱导的$Γ(h\to Z J/Ψ)$和$Γ(h\to ZΨ(2S))$衰变率与树能级$h\to ZZ^*\to Z V$跃迁的贡献相当.

英文摘要：

Rare decays $h\to Z V$ with $V$ denoting the narrow $c\bar{c}$ or $b\bar{b}$ resonances, such as $J/Ψ$ or $Υ$ states, have been analyzed. Within the standard model, these channels may proceed through the tree-level transition $h\to ZZ^*$ with the virtual $Z^*\to V$, and also loop-induced process $h\to Zγ^*$, followed by $γ^*\to V$. Our analysis shows that, for the bottomonium final states, the decay rate of $h\to Z Υ$ from the loop-induced process is small and the former transition gives the dominant contribution; while, for the charmonium final states, $Γ(h\to Z J/Ψ)$ and $Γ(h\to ZΨ(2S))$ induced by $h\to Zγ^* \to Z V$ could be comparable to the contribution given by the tree-level $h\to ZZ^*\to Z V$ transition.

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