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arXiv 0906.2485hep-ph
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Y(4140)能是$c \bar c s \bar s$四夸克态吗?

Can Y(4140) be a $c \bar c s \bar s$ tetraquark ?

Fl. Stancu

摘要:

本文采用色磁相互作用和从介子和重子谱中提取有效夸克质量的简单夸克模型,计算了$c \bar c s \bar s$型四夸克的能谱。人们很想看看这个光谱是否可以容纳CDF合作观察到的共振Y(4140),但尚未得到证实。结果似乎有利于J $^{PC}$ = 1 $^{++}$扇区,当描述为$c \bar c q \bar q$四夸克态时,该扇区与VV通道的耦合几乎与X(3872)一样小。这表明Y(4140)可能是X(3872)的奇怪伙伴,在四夸克解释中。然而,不能完全排除扇区J $^{PC}$ = 0 $^{++}$。这项工作的问题的做法提取有效的夸克质量包含自旋独立的贡献,从介子和重子,用于多夸克系统以及。

英文摘要:

In this exploratory study the spectrum of tetraquarks of type $c \bar c s \bar s$ is calculated within a simple quark model with chromomagnetic interaction and effective quark masses extracted from meson and baryon spectra. It is tempting to see if this spectrum can accommodate the resonance Y(4140), observed by the CDF collaboration, but not yet confirmed. The results seem to favour the J$^{PC}$ = 1$^{++}$ sector where the coupling to the VV channel is nearly as small as that of X(3872), when described as a $c \bar c q \bar q$ tetraquark. This suggests that Y(4140) could possibly be the strange partner of X(3872), in a tetraquark interpretation. However the sector J$^{PC}$ = 0$^{++}$ cannot entirely be excluded. This work questions the practice of extracting effective quark masses containing spin independent contributions, from mesons and baryons, to be used in multiquark systems as well.

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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