Contributions of qqqq(q) components to nucleon spin structure
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(q) admixtures in the nucleon wave functions, where the qqqq(q) 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(q) 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.
five quark components, spin content, azial vector coupling constant, sum rule for polarized nucleon, nucleon
WAN Meng TIAN Wei-Zhao CHEN Hong
School of Physical Science and Technology, Southwest University, Chongqing 400715, China
国际会议
重庆
英文
18-20
2008-05-10（万方平台首次上网日期，不代表论文的发表时间）