Contributions of qqqq components to nucleon spin structure |
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引用本文: | 万猛,田维钊,陈洪.Contributions of qqqq components to nucleon spin structure[J].中国物理C(英文版),2009(Z1):18-20. |
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作者姓名: | 万猛 田维钊 陈洪 |
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基金项目: | Supported by National Natural Foundation of China (10575083) |
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摘 要: | The spin structure of nucleons is presented in the framework of an extended quark model which in addition to the conventional qqq structure also takes into account qqqq admixtures in the nucleon wave functions, where the qqqq components are in colored quark cluster configurations. The axial vector weak coupling constant and spin distributions for polarized nucleons as well as spin content are obtained for the lowest positive parity qqqq configurations in flavor-spin dependent interaction. In particular, the contributions of the down and strange quarks to the proton spin and the sum rule for polarized neutron are negative, in agreement with recent experiments.
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关 键 词: | five quark components spin content axial vector coupling constant sum rule for polarized nucleon nucleon |
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