非零$Z γγ$顶点对$H\to γγγ$衰变的影响
Implications of a nonvanishing $Z γγ$ vertex on the $H\to γγγ$ decay
摘要：
$Z\to γγ$和$H\to γγγ$衰变在标准模型中是严格禁止的，但它们可以由违反洛伦兹对称性或CPT定理的理论引起。通过假设在新物理的某些背景下诱导出一个非零的$Zγγ$顶点，并通过分析$Z$共振中的反应$H\to γZ^*\to γγγ$，我们得到了$H\to γγγ$衰变分支比的一个估计.具体地，发现具有$10^{-7}$量级的$BR(H\to γγγ)\lesssim BR(H\to γZ)BR_{Exp}(Z\to γγ)$。
英文摘要：
The $Z\to γγ$ and $H\to γγγ$ decays are strictly forbidden in the Standard Model, but they can be induced by theories that violate Lorentz symmetry or the CPT theorem. By assuming that a nonvanishing $Zγγ$ vertex is induced in some context of new physics, and by analyzing the reaction $H\to γZ^*\to γγγ$ in the $Z$ resonance, we obtain an estimation for the branching ratio of the $H\to γγγ$ decay. Specifically, it is found that $BR(H\to γγγ)\lesssim BR(H\to γZ)BR_{Exp}(Z\to γγ)$, which is of the order of $10^{-7}$.
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