Contributions of qqqq q components to nucleon spin structure

WAN Meng; TIAN Wei-Zhao; CHEN Hong

doi:10.1088/1674-1137/33/S1/006

Chinese Physics C> 2009, Vol. 33> Issue(S1) : 18-20 DOI: 10.1088/1674-1137/33/S1/006

Contributions of qqqq q components to nucleon spin structure

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Abstract：
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.

References

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WAN Meng, TIAN Wei-Zhao and CHEN Hong. Contributions of qqqq q components to nucleon spin structure[J]. Chinese Physics C, 2009, 33(S1): 18-20. doi: 10.1088/1674-1137/33/S1/006

WAN Meng, TIAN Wei-Zhao and CHEN Hong. Contributions of qqqq q components to nucleon spin structure[J]. Chinese Physics C, 2009, 33(S1): 18-20. doi: 10.1088/1674-1137/33/S1/006 shu

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Received: 2008-10-22
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Contributions of qqqq q components to nucleon spin structure

Corresponding author: WAN Meng,

Received Date: 2008-10-22
Accepted Date: 1900-01-01
Available Online: 2009-01-10

Abstract: 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.