Based on the flux tube model, the effects of the confining potentials of different configurations, namely the △-type and the Y-type, on the spectra of baryons are studied on SUSF（6） basis. The baryon spectra are ob...Based on the flux tube model, the effects of the confining potentials of different configurations, namely the △-type and the Y-type, on the spectra of baryons are studied on SUSF（6） basis. The baryon spectra are obtained in a unified manner. Our result shows that by employing either the △-mode or the Y-mode confining potential, one can achieve reasonable baryon spectra. The △-mode may be mostly effective for the short- and medium-distances, while the Y-mode may offer more contributions to the spectra for long-distances. Although the binding energies in baryon spectra may deviate by a few to several tens MeV for different modes, it is hard to determine either one to be dominant by simply evaluating the baryon spectra. One may need to invoke the baryon decay process to make further judgement.展开更多
We discuss the moment analysis method for the 0^(++)and 2^(++)coupling mode of fJ(1710)for incomplete phase space in the radiative decay J/ψ→γK^(+)K^(-),and give a new formulation of analyzing the fJ(1710)structure...We discuss the moment analysis method for the 0^(++)and 2^(++)coupling mode of fJ(1710)for incomplete phase space in the radiative decay J/ψ→γK^(+)K^(-),and give a new formulation of analyzing the fJ(1710)structure for the Beijing Spectrometer detector at the Beijing Electron-Positron Collider.The incomplete detection phase space results in a significant effect on the moment analysis.展开更多
The property of σ-meson or f0(400-1200)is studied in the general color symmetry model(GCM)for quantum chromodynamics.With recent determined values of mσ,fσand fπin GCM,the isoscalarππS-wave amplitude is calculat...The property of σ-meson or f0(400-1200)is studied in the general color symmetry model(GCM)for quantum chromodynamics.With recent determined values of mσ,fσand fπin GCM,the isoscalarππS-wave amplitude is calculated without any free parameter.The T-matrix pole for f0(400-1200)is found to be 1011-i 284MeV,which is very close to the Particle Data Group value(400-1200)-i(300-500)MeV.展开更多
We re-study nucleon pole contribution in J/ψ → NN^-π decays by including the imaginary part for the propagator of the off-shell nucleon with energy above π N threshold. It is found that when including the imaginar...We re-study nucleon pole contribution in J/ψ → NN^-π decays by including the imaginary part for the propagator of the off-shell nucleon with energy above π N threshold. It is found that when including the imaginary part in the propagator, the branching ratio of the decay width will descend about 11% compared with the result without including the imaginary part, no matter whether including the off-shell form factors or not. It also leads to a phase of up to 25° for the off-shell nucleon propagator at invariant mass around 1400 MeV. This effect needs to be considered for detailed partial wave analysis of N^＊ resonances around this mass region.展开更多
基金The project supported by the Special Scientific Research Foundation for Doctoral Programs of Universities of China.
文摘Based on the flux tube model, the effects of the confining potentials of different configurations, namely the △-type and the Y-type, on the spectra of baryons are studied on SUSF（6） basis. The baryon spectra are obtained in a unified manner. Our result shows that by employing either the △-mode or the Y-mode confining potential, one can achieve reasonable baryon spectra. The △-mode may be mostly effective for the short- and medium-distances, while the Y-mode may offer more contributions to the spectra for long-distances. Although the binding energies in baryon spectra may deviate by a few to several tens MeV for different modes, it is hard to determine either one to be dominant by simply evaluating the baryon spectra. One may need to invoke the baryon decay process to make further judgement.
基金Supported in part by the National Natural Science Foundation of China under Grant No.19905011the Beijing Sepectrometer Collaboration Project.
文摘We discuss the moment analysis method for the 0^(++)and 2^(++)coupling mode of fJ(1710)for incomplete phase space in the radiative decay J/ψ→γK^(+)K^(-),and give a new formulation of analyzing the fJ(1710)structure for the Beijing Spectrometer detector at the Beijing Electron-Positron Collider.The incomplete detection phase space results in a significant effect on the moment analysis.
基金Supported by the National Natural Science Foundation of China under Grant Nos.19335022 and 19675057the China Post-doctoral Science Foundation+1 种基金the Grant LWTZ 1298 of the Academy of Sciencesthe K.C.Wong Education Foundation.
文摘The property of σ-meson or f0(400-1200)is studied in the general color symmetry model(GCM)for quantum chromodynamics.With recent determined values of mσ,fσand fπin GCM,the isoscalarππS-wave amplitude is calculated without any free parameter.The T-matrix pole for f0(400-1200)is found to be 1011-i 284MeV,which is very close to the Particle Data Group value(400-1200)-i(300-500)MeV.
基金The project partly supported by National Natural Science Foundation of China under Grant Nos. 10475089, 10435080, 10447002, 10147202, and 10225525, the Physical Science Fund of Guangxi Province under Grant No. 9714005, and the Knowledge Innovation Key Project of the Chinese Academy of Sciences under Grant No. KJCX2-SW-N02.
文摘We re-study nucleon pole contribution in J/ψ → NN^-π decays by including the imaginary part for the propagator of the off-shell nucleon with energy above π N threshold. It is found that when including the imaginary part in the propagator, the branching ratio of the decay width will descend about 11% compared with the result without including the imaginary part, no matter whether including the off-shell form factors or not. It also leads to a phase of up to 25° for the off-shell nucleon propagator at invariant mass around 1400 MeV. This effect needs to be considered for detailed partial wave analysis of N^＊ resonances around this mass region.
