Baryon-Meson Couplings in the qq^^- Pair-Creation Quark Model. II : Mesonic Decay Widths of P-Wave Baryons : Nuclear Physics
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概要
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Characteristic features of baryon-meson couplings for P-wave baryons are studied in a quark model in which qq^^- pair-creation processes inherent in the quark-gluon interaction Lagrangian are explicitly incorporated. The transition amplitudes for decays to the lowest S-wave 3q and qq^^- configurations are transformed to the standard vertex functions for meson emission with the flavor dependence explicitly shown in the operator formalism. These vertex functions consist of two independent flavor amplitudes A(k) and B(k) evaluated at the decaying momentum k, which mainly contribute to S-wave and D-wave decays, respectively. The pseudo-scalar meson decays of P-wave baryons are successfully described in the SU_6 model where A(k) and B(k) are separately assumed to follow the exact SU_6 rules with respect to the spin and flavor degrees of freedom. A detailed analysis of model predictions for A(k) and B(k) by the use of the present pair-creation interaction shows that B(k) follows the approximate SU_6 rules, while the dominant S-wave amplitude A(k) has rather irregular behavior in magnitude with respect to the pseudo-scalar meson couplings, and the electric- and magnetic-type vector meson ones. For correct description of the experimental data for pseudoscalar meson decays, some mechanism seems to be needed to reduce the relative importance of A(k) to B(k) in the present model. A possible modification of the pair-creation interaction is discussed.
- 理論物理学刊行会の論文
- 1993-02-25
著者
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FUJIWARA Yoshikazu
Department of Physics, Kyoto University
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Fujiwara Yoshihisa
Department Of Physics Tokyo Institute Of Technology
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Fujiwara Y
Department Of Physics Kyoto University
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Fujiwara Yoshikazu
Department Of Clinical Gene Therapy Osaka University Graduate School Of Medicine
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FUJIWARA Yoshikazu
Research Institute for Fandamental Physics, Kyoto University
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FUJIWARA Yoshikazu
Institute of Theoretical Physics, University of Regensburg : Department of Physics, Kyoto University
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