赝标量介子双轻子衰变的现象学估计与格点QCD的比较
Comparing phenomenological estimates of dilepton decays of pseudoscalar mesons with lattice QCD
AI总结：
本文比较赝标量介子双轻子衰变的现象学预言与格点QCD结果，重点讨论π0→e+e-和KL→ℓ+ℓ-衰变，并分析如何借助未来实验和格点QCD进展改进不确定性估计。
摘要：
赝标量介子的双轻子衰变一直受到特别关注，这得益于它们对低能QCD动力学以及超出标准模型信号的敏感性。在这一背景下，我们简要回顾了我们最近关于稀有衰变$π^0\to e^+e^-$的改进标准模型预言的研究，并将其与格点上首次确定的结果进行比较，该格点计算还作为副产品预言了$π^0\to γγ$衰变宽度。此外，我们讨论了我们最近关于$K_L\to\ell^+\ell^-$衰变的工作及其与格点QCD的联系。我们评论了当前的不确定性估计，并讨论了如何利用未来实验和格点QCD的进展来改进这些估计。
英文摘要：
Dilepton decays of pseudoscalar mesons have been drawing particular interest, thanks to their sensitivity to both the QCD dynamics at low energy and also signals beyond the Standard Model. In this context, we shortly review our recent study on an improved Standard-Model prediction for the rare decay $π^0\to e^+e^-$, and compare it with the first determination on the lattice that predicted also the $π^0\to γγ$ decay width as a byproduct. In addition, we discuss our recent work on $K_L\to\ell^+\ell^-$ decays and its connection to lattice QCD. We comment on the current uncertainty estimates and discuss how they could be improved profiting from future experiments and progress in lattice QCD.
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