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arXiv 1406.7281hep-ph
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奇异$XY \! Z$介子形成和衰变的新图象

A New Picture for the Formation and Decay of the Exotic $XY \! Z$ Mesons

Stanley J. Brodsky, Dae Sung Hwang, Richard F. Lebed

摘要:

我们提出了一个新的动力学图像,确定形成的异国情调的$\bar c c$ -包含状态$XY \! Z$与约束诱导强子化的一个紧凑的双夸克和反双夸克的快速分离对。这幅图结合了双夸克模型的优点,它可以容纳大部分已知的$XY \! Z$光谱,以及实验事实,即这些状态都相对较窄,并迅速产生。它也很自然地解释了某些奇异态倾向于衰变到$ψ(2S)$,而不是$J/ψ$,用一个简单的波函数重叠效应。

英文摘要:

We present a new dynamical picture that identifies the formation of the exotic $\bar c c$-containing states $XY \! Z$ with the confinement-induced hadronization of a rapidly separating pair of a compact diquark and antidiquark. This picture combines the advantages of diquark-based models, which can accommodate much of the known $XY \! Z$ spectrum, with the experimental fact that such states are both relatively narrow and are produced promptly. It also naturally explains the preference of some of the exotic states to decay to $ψ(2S)$, rather than $J/ψ$, in terms of a simple wave-function overlap effect.

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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