xc0→BB^-MM衰变中的重子共振态

基于SU（3）对称性研究了Xc0的遍举多体衰变xc0→BB^-MM（B：重子，M：介子），通过同位旋耦合常数构造了xc0→BB^-→BB^-MM衰变的跃迁振幅．基于这些跃迁振幅，发现N^＊共振态对xc0→BB^-ππ的贡献相对较大，这个衰变道可以在实验上用来研究N^＊共振态．     

重子五夸克波函数与核子磁矩

依据ＳＵＦ（３）味对称性并运用群论方法提出了一个简单的重子夸克模型（ｑｑｑ）＋（ｑｑｑｑｑ），计算了核子的磁矩，得到了静态核子磁矩的一般表达式；并由质子、中子磁矩的实验值定出了静态核子内各夸克组分的权重，从而得到了核子的静态波函数．     

Pentaquark■~+对核物质状态方程的影响

假定■~+通过交换有效的同位旋标量介子σ和ω与核子和它本身发生相互作用,在密度相关的相对论平均场理论基础上研究了{p,n,■~+}系统状态方程和可能形成的亚稳定态．讨论了在不同的重子密度下质子中子同位旋比值以及Pentaquark ■~+成分对系统单个重子能的影响．计算结果表明,在单个重子能取极小时,■~+有可能在核物质中束缚存在．     

Doubly Heavy Baryon Production at Polarized Photon Collider

We study the inclusive production of doubly heavy baryon Ξcc at polarized photon collider. Our results show that proper choice of the initial beam polarizations may increase the production rate of Ξcc approximately 10%.     

序言

Since the announcement of the discovery of a ＂perfect liquid＂ at the Relativistic Heavy Ion Collider （RHIC）, significant progress has been made towards understanding the details of the property of the matter that RHIC has created. Yet there are still puzzles and unsolved problems. At frontiers from other accelerator facilities like Gesellschaft fur Schwerionenforschung, German （GSI） and the Heavy Ion Cooler Storage Ring at institute of Modern Physics, China （CSR）, which are to understand the structure and behavior of the world that surrounds us -- a mission that is similar to RHIC but with different aspects, upgrade plans are on-going and hopefully they will open horizons for potential new discoveries. To promote and facilitate interactions amongst scientists from both experiments and theory, and to enhance the direct exchange of scientific information amongst scientists from both Hadron physics and Heavy Ion physics, the ＂International Workshop on Hadron Physics and Property of High Baryon Density Matter＂ was held in Xi＇an during Nov. 22 to Nov. 25 as a satellite meeting of QM 2006.     

强子物理中的一些问题

简要介绍了当前强作用物理研究的基本目标 .对其中QCD的参数和强子谱研究的问题做了较细致的讨论 ,特别是讨论了北京正负电子对撞机 /北京谱仪可以开展的强子物理实验研究.The basic goals for the study of hadronic physics are briefly discussed. The determination of the QCD parameters and the study of the hadron spectroscopy are discussed in more detail. It is shown that BEPC/BES can play a role in the study of hadron physics.     

X（1835）： A Possible Baryonium？

We point out that the large pp^- coupling of X（1835） and the suppression of the three-body strange final states strongly indicate that X（1835） may be a pp^- baryonium. We also point out that the branching ratio of X（1835） →ηππ should be bigger than that of X（1835） →η′ππ. We suggest BES search X（1835） in the ηππ channel Finally, X（1835） may be used a tetraquark generator if X（1835） is really established as a baryonium state.     

Sigma Terms and Strangeness Contents of Baryon Octet in Modified Chiral Perturbation Theory

In the frame work of chiral perturbation theory, a modified effective Lagrangian for meson-baryon system is constructed, where the SU（3） breaking effect for meson is considered. The difference between physical and chiral limlt decay constants is taken into account. Calculated to one 1ooi） at O（p^3）, the sigma terms and strangeness contents of baryon octet are obtained.     

Search for Exotic Strange Dibaryon in Relativistic Heavy Ion Collisions

The exotic strange dibaryon particle (ΩΩ)0 with S = -6 can be produced in relativistic heavy ion collisions. The yields of this kind of exotic strange dibaryon particles can increase signitlcantly soon as the formation of QGP does exhibit after the collision. If there is no phase transition after the collision, the upper bound of the production of this diomega can be estimated from the free hadronic gas model for nuclear matter. The relative yield ratio of diomega to deuteron is less than 0.000205, this means that if there is no QGP creation it is difficult to observe the production of diomega in relativistic heavy ion collisions.