The ■ tetraquark states and the structure of X(2239) observed by the BESⅢ collaboration

We investigate the mass spectrum of the■tetraquark states in the relativized quark model.By solving the Schrodinger-like equation with the relativized potential,the masses of S-and P-wave■tetraquarks are obtained.The screening effects are also taken into account.It is found that the resonant structureX(2239)observed in thee+e-→K+K-process by the BESIII collaboration can be assigned as a P-wave 1--■tetraquark state.Furthermore,the radiative transition and the strong decay behavior of this structure are also estimated,which can provide helpful information for future experimental searches.     

N、Δ重子谱计算中高组态混合效应的影响

本文在Ｎ≤６的组态空间里对Ｎ、Δ能谱重新进行了计算，着重考查高组态的混合效应对能谱的影响．结果表明：计算的收敛性很好；在采用适当形式的禁闭位的前提下，高组态的引入可以使某些能级的计算得到明显改善．     

A Discussion of Deuteron Transverse Charge Densities

The deuteron transverse charge density ρC(b) is the two-dimensional Fourier transform of its charge form factor in the impact space. We show that different parameterizations of the charge form factors provide different ρC(b),in particular at the central value of impact parameter(b = 0), although all the parameterizations can well reproduce the form factors in the region of small Q2. In addition, we also check the explicit contributions from the different coordinate intervals of the deuteron wave function to its root-mean-square radius.     

相对论效应对有限温下重夸克偶素的性质的影响

考虑相对论修正对重夸克偶素结合和分解所产生的作用，计算了重夸克偶素在热力学环境中的临界性质，并与非相对论模型理论进行了比较．     

相对论夸克模型和N–Δ能量劈裂

基于相对论夸克模型,在夸克层次上研究了N-Δ的质量和二者的能量劈裂,通过引入了赝标量π介子云效应,得到了π和核子之间的耦合常数g_πNN,以及单胶子交换势和单π介子交换势分别对N-Δ能量劈裂的贡献,计算结果较好地与实验值得到了吻合.另外我们还比较了相对论与非相对论夸克模型在处理上的不同.     

相对论夸克模型和N—△能量劈裂

基于相对论夸克模型，在夸克层次上研究了N-△的质量和二者的能量劈裂，通过引入了赝标量π介子云效应，得到了π和核子宰的耦合常数gxNN，以及单胶子交换势和单π介子交换势分别对N-△能量劈裂的贡献，计算结果较好地与实验值得到了吻合。另外我们还比较了相对论与非对论夸克模型在处理上的不同。     

基态介子辐射衰变中的屏蔽效应

利用屏蔽位对基态介子辐射衰变宽度进行了计算．通过与线性位的结果相比较，得到了屏蔽位结果的一些特点．     

粲夸克偶素和b夸克偶素的色屏蔽和分解

用非相对论的色屏蔽势模型研究粲夸克偶素和b夸克偶素束缚态的结合和分解.用两种参数化形式的位势,计算了在热力学环境中的色屏蔽长度.结果表明,临界屏蔽长度r与位势的形式有密切的关系.     

重夸克等效理论和重味强子体系质量谱的研究

利用重夸克等数理论,对重味强子Qq、QQq和Qqq以及四夸克态QQqq的质量谱进行了系统定性的研究,并与势模型对QQqq的计算结果进行了比较.     

Two-photon exchange properties in to proton electromagnetic time-like region

The contributions of two-photon exchange in the process e＋ ＋ e-→ p ＋ p including N and △ intermediate states are estimated in a simple hadronic model. The corrections to the unpolarized cross section as well as to the polarized observables Px and Px are evaluated. The results show the corrections to unpolarized cross section are small and the angle dependence becomes weak at small s after considering the N and △（1232） contributions simultaneously, while the correction to Px is enhanced.