The Spin Crisis of the Proton

Ma Weixing; Wu Qing

Chinese Physics C> 1997, Vol. 21> Issue(4) : 362-367

The Spin Crisis of the Proton

Ma Weixing ^, ,
Wu Qing

Institute of High Energy Physics,The Chinese Academy of Sciences,Beijing 1000392 Department of Physics,Defense University of Scienceand Technology,Changsha 410073

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Abstract：
The relationship between the Gerasimov-Drell-Hearn(GDH)sum rule and the first monent,ΓP-the proton spin dependent structure function integral,is established.According to the sum rule and quark structure model of baryon,[SU_sf(6)⊙O(3)]⊙SU_c(3),the spin problem of the proton is discussed The present theoretical results are also compared with the data measured by EMC and SLAC groups.Our prediction is in good agreement with the data.We find that the P₃₃(1232)photo-cxcitation dominates the spin structure function integrals and contributes negatively at low momentum transfer.At higher momentum transfer,the contribution of the P₃₃ is positive,and it decreases rapidly as Q² increasing and finally becomes negligible The integral changes its sign from negative into positive at about Q²=0.3GeV².

References

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[1] Li Yangguo . Antiproton -Nucleus Charge Exchange Reaction and Inelastic Scattering. Chinese Physics C, 1996, 20(11): 1021-1027.
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Ma Weixing and Wu Qing. The Spin Crisis of the Proton[J]. Chinese Physics C, 1997, 21(4): 362-367.

Ma Weixing and Wu Qing. The Spin Crisis of the Proton[J]. Chinese Physics C, 1997, 21(4): 362-367. shu

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Received: 1900-01-01
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

The Spin Crisis of the Proton

Ma Weixing ^,
Wu Qing

Corresponding author: Ma Weixing,

Institute of High Energy Physics,The Chinese Academy of Sciences,Beijing 1000392 Department of Physics,Defense University of Scienceand Technology,Changsha 410073

Received Date: 1900-01-01
Accepted Date: 1900-01-01
Available Online: 1997-04-05

Abstract: The relationship between the Gerasimov-Drell-Hearn(GDH)sum rule and the first monent,ΓP-the proton spin dependent structure function integral,is established.According to the sum rule and quark structure model of baryon,[SU_sf(6)⊙O(3)]⊙SU_c(3),the spin problem of the proton is discussed The present theoretical results are also compared with the data measured by EMC and SLAC groups.Our prediction is in good agreement with the data.We find that the P₃₃(1232)photo-cxcitation dominates the spin structure function integrals and contributes negatively at low momentum transfer.At higher momentum transfer,the contribution of the P₃₃ is positive,and it decreases rapidly as Q² increasing and finally becomes negligible The integral changes its sign from negative into positive at about Q²=0.3GeV².