Baryon-Meson Couplings in the qq^^- Pair-Creation Quark Model. III : Energy Shifts of P-Wave Baryons : Nuclear Physics

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概要

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• We continue the previous quark-model studies of qq^^- pair-creation transition amplitudes for P-wave baryons and evaluate the energy shifts of compact 3q energies due to the couplings to baryon-meson composite configurations. These baryon-meson configurations are described by the antisymmetrized (3q)(qq^^-) cluster-model wave functions composed of simple harmonic oscillator functions and the plane-wave relative motion. The rich spin-flavor SU_6 structure of the transition amplitudes due to the off-shell Fermi-Breit interaction and threshold effects of various baryon-meson configurations predict non-uniform energy shifts for each member of the SU_6 supermultiplet, thus yielding a possible resolution of the missing LS force problem in the P-wave baryons. A typical example is given for a slightly modified off-shell Fermi-Breit interaction in which the sign of the SU_6 breaking term is inverted. Except for the flavor-singlet Λ resonances at the lowest energies, the energy spectrum and the mixing features of the spin S=1/2 and 3/2 resonances are well reproduced together with the partial decay widths to pseudo-scalar mesons and ground-state baryons.

• 理論物理学刊行会の論文
• 1993-07-25

著者

• Fujiwara Yoshikazu

  Department Of Clinical Gene Therapy Osaka University Graduate School Of Medicine

• FUJIWARA Yoshikazu

  Research Institute for Fandamental Physics, Kyoto University

• FUJIWARA Yoshikazu

  Institute of Theoretical Physics, University of Regensburg : Department of Physics, Kyoto University

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