Exotic vector charmonium and its leptonic decay width
Exotic vector charmonium and its leptonic decay width
复制标题
外来矢量粲素及其轻子衰变宽度
DOI：
10.1088/1674-1137/40/8/081002
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发表时间：
2016
影响因子：
3.6
通讯作者：
Liu Zhao-Feng
中科院分区：
文献类型：
--
作者：
Chen Ying;Chiu Wei Feng;Gong Ming;Gui Long Cheng;Liu Zhao-Feng
我们提出了一种新的插值场算子，它体现了粲夸克-反夸克对对胶子自由度反冲的类杂化构形。GeV是一个重矢量类查莫尼亚态，质量为4.33(2)，在猝灭近似中从常规查莫尼亚态中解脱出来。这种状态对类杂合算子有亲和力，但对相关的夸克双线性算子的耦合较小。我们还尝试提取它的轻子衰变常数，并给出一个暂定的上限，即它小于J/ψ的十分之一，这对应于大约几十eV的轻子衰变宽度。本文还讨论了该状态与X（4260）的关系。
We propose a novel type of interpolating field operator, which manifests the hybrid-like configuration that the charm quark-antiquark pair recoils against gluonic degrees of freedom. A heavy vector charmonium-like state with a mass of 4.33(2),GeV is disentangled from the conventional charmonium states in the quenched approximation. This state has affinity for the hybrid-like operators but couples less to the relevant quark bilinear operator. We also try to extract its leptonic decay constant and give a tentative upper limit that it is less than one tenth of that of J/ψ, which corresponds to a leptonic decay width about dozens of eV. The connection of this state with X(4260) is also discussed.