神奇有趣的五夸克态

对今年国际上有关五夸克态的实验与理论研究现状作一个总体的评述 ,指出了有待解决的主要问题和相关的一些背景知识 ,并简单介绍了作者所在研究小组的有关研究工作 .     

关联对的结构

利用了类似于H–F的方法来自洽地确定S对(和D对)的结构,此外,为了避免因辛弱数混合而产生的伪态困难,改进了S对的定义并用不成对粒子算符来构造D对,以使它们相互独立.     

相互作用玻色子模型的非厄米Dyson玻色子展开途径

通过Dyson玻色子展开及修正的Jancovici和Schiff代换,得到费米子集体S,D对态空间与相互作用玻色子模型s,d空间之间的一一对应.费米子算符的玻色子像被唯一确定,IBM哈密顿量具有非厄米形式.费米子矩阵元能够在玻色子空间内直接计算,并且,当需要清除伪态时,相应的投影计算也能在玻色子空间进行.     

Meson decays in an extended Nambu-Jona-Lasinio model with heavy quark flavors

In a previous work, we proposed an extended Nmnbu-Jona-Lasinio （NJL） model including heavy quark flavors. In this work, we will calculate strong and radiative decays of vector mesons in this extended NJL model, including light p, w, K＊, θ and heavy D＊, D＊s, B＊, Bs＊.     

可能的qQ■，qq■■和qQ■■重四夸克态(英文)

假设X(3872)是一个qc(?)四夸克态,并用它的质量作为输入,用具有味对称性破坏的色磁相互作用系统研究了可能的重四夸克态的质量谱．     

A note on Ξc(3055)+ and Ξc(3123)+

The Babar Collaboration announced two new excited charmed baryons Ξ_c(3055)⁺ and Ξ_c(3123)⁺. We study their strong decays assuming they are D-wave states. Some assignments are excluded by comparing our numerical results with the experimental values of the total widths of Ξ_c(3055)⁺ and Ξ_c(3123)⁺. We also suggest some possible decay modes, which will be helpful to     

Heavy mesons in the Nambu-Jona-Lasinio model

We propose an extended Nambu-Jona-Lasinio model to include heavy mesons with heavy quark symmetry.The quark current-current interaction is generalized to include the heavy quark currents. In order to comply with the heavy quark spin symmetry at the heavy quark limit,the dependence of the quark mass on the interaction strength is introduced. The light and heavy pseudo-scalar and vector mesons,their masses and the weak decay constants are calculated in the unified frame.     

Dynamical study of the possible molecular state X（3872） with the s-channel one gluon exchange interaction

The recently observed X（3872） resonance, which is difficult to assign a conventional cc charmonium state in the quark model, may be interpreted as a molecular state. Such a molecular state is a hidden flavor four quark state because of its charmonium-like quantum numbers. The s-channel one gluon exchange is an interaction which only acts in the hidden flavor multi-quark system. In this paper, we will study the X（3872） and other similiar hidden flavor molecular states in a quark model by taking into account the s-channel one gluon exchange interaction.     

Jaffe与Wilczek双夸克模型中的负宇称五夸克态

如果Jaffe与Wilczek关于Q5+五夸克态的双夸克图像是正确的话,那就应该存在负宇称的五夸克SU(3)八重态与单态,其中两个双夸克间没有轨道激发.这些态比Q5+质量低,与传统夸克模型中的由三夸克构成的重子的轨道激发质量接近.我们计算了这些负宇称态的质量与磁矩,用手征有效拉氏量讨论了他们可能的强衰变模式和选择定择，发现有两个态可能比较窄.我们建议实验上寻找这九个额外的负宇称态.如果将来的实验确实发现了这些态,那是对Jaffe与Wilczek双夸克模型的直接验证.否则,应该重新评估Jaffe与Wilczek的双夸克图像甚至抛弃这个模型.