“$ρπ$难题”的进一步见解
Further insights into the "$ρπ$ puzzle"
摘要：
在系统研究$J/ψ(ψ^\prime)\to VP$（$V$和$P$分别代表光矢量和赝标介子）的基础上，我们确定了电磁跃迁和中间介子环跃迁所起的作用，这是理解$J/ψ$和$ψ^\prime$与$VP$耦合的基本成分.我们发现，一方面，在$ψ^\prime\to ρπ$和$K^*\bar{K}+c.c.$中的EM跃迁具有相对较大的干扰，如矢量介子优势（VMD）所明确显示的。另一方面，$ψ^\prime$的强衰变受到中间介子环跃迁的相对较大的相消干扰。通过在$J/ψ(ψ^\prime)\to VP$的整体研究中确定这些机制，我们对所谓的“$ρπ$之谜”提供了一个连贯的理解。
英文摘要：
Based on a systematic investigation of $J/ψ(ψ^\prime)\to VP$, where $V$ and $P$ stand for light vector and pseudoscalar mesons, we identify the role played by the electromagnetic (EM) transitions and intermediate meson loop transitions, which are essential ingredients for understanding the $J/ψ$ and $ψ^\prime$ couplings to $VP$. We show that on the one hand, the EM transitions have relatively larger interferences in $ψ^\prime\to ρπ$ and $K^*\bar{K}+c.c.$ as explicitly shown by vector meson dominance (VMD). On the other hand, the strong decay of $ψ^\prime$ receives relatively larger destructive interferences from the intermediate meson loop transitions. By identifying these mechanisms in an overall study of $J/ψ(ψ^\prime)\to VP$, we provide a coherent understanding of the so-called "$ρπ$ puzzle".
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