Λ(1405) as a resonance in the baryon-meson scattering coupled to the q 3 state in a quark model
Λ(1405) as a resonance in the baryon-meson scattering coupled to the q 3 state in a quark model
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DOI：
10.1103/physrevc.76.035204
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发表时间：
2007-05
影响因子：
3.1
通讯作者：
S. Takeuchi;K. Shimizu
中科院分区：
文献类型：
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作者：
S. Takeuchi;K. Shimizu
为了描述重子-介子散射中的A（1405）共振，我们研究了味单态q3（0 s）2（0 p）（A1极）的q3-qq散射系统.散射用夸克集团模型（QCM）处理。A1极点被视为嵌入在连续介质中的束缚态。我们发现，在自旋1 2，同位旋0通道中，即使A1极的质量高于NK阈值，也会出现一个峰值。当到A'极的耦合被切断时，该峰值消失。使用所观察到的强子质量在QCM的动力学部分也被发现是重要的，在再现一个峰值低于NK阈值。
To describe A(1405) as a resonance in baryon-meson scattering, we have investigated the q 3 -qq scattering system with the flavor-singlet q 3 (0s) 2 (0 p) state (the A 1 pole). The scattering is treated by the quark cluster model (QCM). The A 1 pole is treated as a bound state embedded in the continuum. We have found that a peak appears below the NK threshold in the spin-1 2, isospin-0 channel even if the mass of the A 1 pole is above the threshold. This peak disappears when the coupling to the A' pole is switched off. Using the observed hadron mass in the kinetic part of QCM is also found to be important in reproducing a peak just below the NK threshold.