双辐射衰变J/ψ→γγV的角分布和推广的矩分析

本文讨论了J/ψ双辐射衰过程J/ψ→γ+X,X→γ+V,V→2P(或3P).对于具有不同自旋-宇称J^P的中间态X,给出了相应的角分布螺旋度形式以及由推广的矩分析方法得到的各种矩的表达式.这些公式对于确定中间态X的自旋是有帮助的.     

J/ψ三级二体强衰变过程的自旋-宇称分析

本文给出了级联衰变过程e⁺+e^－→J/ψ→V+X,X→P₁+Y,Y→P₂+P₃(V代表矢量介子,P_i代表赝标介子)的角分布螺旋度形式,为通过J/ψ三级二体强衰变过程对中间态X粒子进行自旋-宇称分析提供理论公式.     

Large SU（3） Symmetry Breaking in J／ψ→BB Decays

Large SU(3) symmetry breaking effects in J/ψ→BB decay processes are discussed using the Mark I,Mark II,DM2 and the recent data from BES Collaboration.     

A Proposal on the Search for the Hybrid with I^G（J^PC）=1^—（1—＋）in the Process J／ψ→ρωππ at Upgraded BEPC／BES

We give the moment expressions for the boson resonances X with spin-parity JXPXC=0 ,1- ,1 and 2 posibly produced in the process J/ψ→ρX,X→b1(1235)π,b1→ωπ in terms of the generalized moment analysis method .The resonance with JXPXC=1- can e distingguished from other resonances by means of these moments exceptfor some rather special cases.The suggestion that the search for the hybrid with IG(JPC)=1-(1- ) can be performed in the decay channl J/ψ→ρωππat upgraded BEPC/BES is presented.     

Search for Exotic States in J／ψ→ρηπ

It is an ideal place to search for exotic states through J/ψ hadronic decays.In this paper,we discuss the way to use the partial wave analysis (PWA) based on covariant helicity amplitude analysis to study the invariant mass spectrum of ηπ and to find the evidence of the existence of exotic states in this channel.The formula for PWA is also given.It is the theoretical foundation of experimental physics analysis on exotic states searching in J/ψ hadronic decays.The theoretical formula can also be used in physics analysis of J/ψ decays into ωππ,φππ,ωKK,φKK and K^* (892)Kπ.     

J／φ→γBB Decays and the Quark—pair Creation Model

We generalize the quark-pair creation model to a study of the radiative decays J/φ→γBB by assuming that the u.d,or s quark pairs are created with the same interaction strength,From the calculation of the ratio of the decay widths （J/φ→γpp)/Γ（J/φ→pp),we extract the quark-pari creation strength gI=15.40GeV,Based on the SU(6)spin-flavour basis and the “uds” basis,the radiative decay branching ratios cotaining strange baryons are evaluated.Measurements for these decay widths from the BESII data are suggested.     

Covariant Helicity Amplitude Analysis for J／ψ→γPP

Covariant helicity amplitude analysis for the process of J/ψ→γPP is discussed starting from the Smatrix elements of decay process,we deduce the formulae of helicity coupling amplitudes for two-body decay process,These formulae are used to analyze intermediate resonance states in the process of J/ψ decay to γππ,γKK,γηη′     

由ψ（2S）→π~＋π~－J／ψ道测量J／ψ轻子道衰变分支比

利用北京谱仪（ＢＥＳ）上取得的ψ（２Ｓ）数据，对ψ（２Ｓ）→π＋π－Ｊ／ψ，Ｊ／ψ→１＋１－和Ｊ／ψ→任意末态两个过程进行了细致的研究，得到Ｊ／ψ的轻子道衰变分支比为Ｂ（Ｊ／ψ→ｅ＋ｅ－）＝（５．９０±０．０７±０．１６）％和Ｂ（Ｊ／ψ→μ＋μ－）＝（５．９６±０．０８±０．１６）％，由此给出Ｂｅ／Ｂμ的值为０．９９０±０．０１８±０．０２４．假定Ｂｅ＝Ｂμ，Ｊ／ψ的轻子道衰变分支比为Ｂ（Ｊ／ψ→１＋１－）＝（５．９３±０．０５±０．１６）％．上述结果可用来估计强相互作用耦合常数αｓ和ＱＣＤ减除参数∧．     

Searching for Electrical Dipole and Chromodipole Moments of a Charm Quark in J／ψ→γφφ Decay

We propose a scheme to search for the electrical dipole moments (EDMs) and chromodipole moments (CDMs) of a charm quark in the decay J/ψ→γφφ based on J/ψ data samples accumulated on the Beijing Electron Positron Collider (BEPC). The EDM and CDM interactions are introduced in this decay and then we relate them to some CP asymmetrical observables, which are predicted in the valence quark model. We propose a method to hunt for these values by measuring associated CP asymmetrical observables, and we also discuss the prospect of such measurement on the BEPC.     

J／ψ与ψ（2S）的轴矢—赝标介子衰变研究

北京谱仪合作组研究了粲夸克偶素J／ψ与ψ(2S)的末态为轴矢介子与赝标介子组合的准二体衰变,观察到若干与朴素理论预期明显分歧的异常表现,这些结果引起了国际理论界的兴趣,目前尚无令人信服的解释。