夸克模型中的Dsj(2317),Dsj(2460)衰变

用夸克模型结合D_s,D_s^*, 讨论窄共振态D_sj^*(2317),D_sj(2460). 除η－π⁰混合角由D^*_s衰变宽度给出, 所有的参数均取自Godfrey和Isgur的夸克模型. 得到的电磁衰变宽度与实验数据和其他作者的结果相一致. 但是, 与现有的实验结果比较, D_sj^*(2317), D_sj(2460)的π介子衰变宽度要小一个数量级. 我们怀疑简单的手征夸克-π轴矢相互作用的哈密顿量不适合于D_sj^*(2317), D_sj(2460)的强衰变.     

封面说明

正本刊2019年的封面上刊登照片及图片,纪念在氦-II中观察到超流80周年以及物理学大师卡皮察(P. L. Kapitza),蒂萨(L.Tisza)和朗道(L.D.Landau)在这一研究领域中的贡献.卡皮察和朗道是苏联物理学家.卡皮察1894年7月8日生于喀琅施塔要塞,卒于1984年.1919年,他毕业于列宁格勒工艺学院,并在1921年赴英国剑桥大学读取博士学位,在那里生活了14年,从事有     

可能的qQqQ,qqQQ和qQQQ重四夸克态

假设X(3872)是一个qcqc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.     

Fine splitting in the charmonium spectrum with a channel coupling effect

We study the fine splitting in the charmomium spectrum in the quark model with the channel coupling effect, including DD, DD^*, D^*D^* and D_sD_s, D_sD_s^*, D_s^*D_s^* channels. The interaction for channel coupling is constructed from the current-current Lagrangian related to the color confinement and the one-gluon exchange potentials. By adopting the massive gluon propagator from the lattice calculation in the nonperturbative region, the coupling interaction is further simplified to four-fermion interaction. The numerical calculation still prefers the assignment 1⁺⁺ of X(3872).     

Possible heavy molecular states composed of a pair of excited charm-strange mesons

The P-wave charm-strange mesons D_s0(2317) and D_s1(2460) lie below the DK and D^* K threshold respectively. They are extremely narrow because their strong decays violate the isospin symmetry. We study the possible heavy molecular states composed of a pair of excited charm strange mesons. As a byproduct, we also present the numerical results for the bottonium-like analogue.