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arXiv 2103.14356hep-ph
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味SU中$Y(4230)$的辐射衰变和介子衰变(3)

Radiative and meson decays of $Y(4230)$ in flavor SU(3)

Luciano Maiani, Antonio D. Polosa, Verónica Riquer

摘要:

在$e^+e^-$碰撞中产生的粲偶素类奇异态$Y(4230)$和不太为人所知的$Y(4320)$是与光子或赝标介子相关的正宇称奇异强子的来源。我们分析了紧凑的四夸克方案中的辐射和π衰变通道,与一种方法,证明工作同样好,在大多数研究的$D^*\to γ/π+D$衰变。矢量$Y$衰变为π介子和$Z_c$态需要电荷共轭和同位旋的翻转,这在所用的形式中得到了适当的描述。然而,发现速率依赖于π介子动量的五次方,这将使最终态$πZ_c(4020)$相对于$πZ_c(3900)$被强烈抑制。考虑到在$Y(4230)$下由$Y(4320)$共振的尾部馈给$πZ_c(4020)$事件,与BES III数据的一致性将得到改善。这些结果应该更新的兴趣,进一步澄清新兴的实验图片在这个质量区。

英文摘要:

The charmonium-like exotic states $Y(4230)$ and the less known $Y(4320)$, produced in $e^+e^-$ collisions, are sources of positive parity exotic hadrons in association with photons or pseudoscalar mesons. We analyze the radiative and pion decay channels in the compact tetraquark scheme, with a method that proves to work equally well in the most studied $D^*\to γ/π+D$ decays. The decay of the vector $Y$ into a pion and a $Z_c$ state requires a flip of charge conjugation and isospin that is described appropriately in the formalism used. Rates however are found to depend on the fifth power of pion momentum which would make the final states $πZ_c(4020)$ strongly suppressed with respect to $πZ_c(3900)$. The agreement with BES III data would be improved considering the $πZ_c(4020)$ events to be fed by the tail of the $Y(4320)$ resonance under the $Y(4230)$. These results should renovate the interest in further clarifying the emerging experimental picture in this mass region.

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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