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arXiv 0809.4363hep-ph
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四夸克态光谱学

Tetraquark spectroscopy

Elena Santopinto, Giuseppe Galata'

摘要:

根据自旋味、颜色和空间自由度对四夸克态进行了完整的分类。讨论了夸克-夸克和反夸克-反夸克子系统的自旋-味和轨道部分的置换对称性。这种完整的分类是通用的和独立于模型的,对模型建立者和实验者都很有用。总的波函数也明确地构造在理想混合的假设下,这个基础上的四夸克态将使本征值问题得到解决的一个明确的动力学模型。这也适用于双夸克-反双夸克模型,其基是我们所构造的基的子集。从正常介子的Iachello质量公式得到四夸克态谱的一个估计,这里推广到四夸克态系统。该质量公式是Gell-Mann Okubo质量公式的推广,其系数已通过最新的PDG数据进行了升级。基态四夸克态九夸克态被确定为$f_{0}(600)$,$κ(800)$,$f_{0}(980)$,$a_{0}(980)$ .用该质量公式计算的质量劈裂与KLOE、Fermilab E791和BES的实验数据进行了比较。还研究了双夸克-反双夸克极限。

英文摘要:

A complete classification of tetraquark states in terms of the spin-flavor, color and spatial degrees of freedom was constructed. The permutational symmetry properties of both the spin-flavor and orbital parts of the quark-quark and antiquark-antiquark subsystems are discussed. This complete classification is general and model-independent, and is useful both for model-builders and experimentalists. The total wave functions are also explicitly constructed in the hypothesis of ideal mixing; this basis for tetraquark states will enable the eigenvalue problem to be solved for a definite dynamical model. This is also valid for diquark-antidiquark models, for which the basis is a subset of the one we have constructed. An evaluation of the tetraquark spectrum is obtained from the Iachello mass formula for normal mesons, here generalized to tetraquark systems. This mass formula is a generalizazion of the Gell-Mann Okubo mass formula, whose coefficients have been upgraded by means of the latest PDG data. The ground state tetraquark nonet was identified with $f_{0}(600)$, $κ(800)$, $f_{0}(980)$, $a_{0}(980)$. The mass splittings predicted by this mass formula are compared to the KLOE, Fermilab E791 and BES experimental data. The diquark-antidiquark limit was also studied.

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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