Quark Polarization in Nucleon

  • Based on the relationship between electron induced deep inelastic scattering and forward virual photon compote scattering, the spin dependent structure function of nucleon and its first moment are expressed in terms of total absorption cross section of virtual photon which are calculated numerically in SU(6) quark model by use of helicity amplitudes. With the theoretical cross sections, the first moment of proton spin dependent structure function is predicted, and then quark polarization is deduced from the predicted moment. The experimental measurements of EMC and SLAC are reproduced thcoretically.
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  • [1] F. Halzen, A. D. Martin, Quark and Lepton, John Wiley and Sons, Inc. 1986.[2]J. Ashman et al., Phys. Lett., B206(1988)364; Nucl, Phys., B328(1988)1.[3]SLAC-El30 Collaboration, G. Baum et al., Phys. Rev. Lett., 51(1983)1135; G. Baum et al., Phys. Rev Lett., 45(1980)2000.[4]SMC, B. Adeva et al., Phys. Lett., B302(1993)533; SMC, D. Adams et al., Phys. Lett., B329(1994)399; B339(1994)332(E); Phys. Lett., B357(1995)248; SLAC-El42 Collaboration, P. L. Anthony et al., Phys. Rev. Lett., 71(1993)959; SLAC-El43 Collaboration, K. Abe et al., Phys. Rev. Lett., 75(1995)25; SLAC-El43 Collaboration, K. Abe et al., Phys. Rev. Lett, 74(1995)346.[5]Hai-yang Cheng, Status of the Proton Spin Problem, IP-ASTP-03-96.[6]R L. Jaffe, MITCTP-2506 and HUP-96 / A003.[7]Wei-hsing Ma, Qing Wu Gerasimov-Drell-Hearn Sum Rule and the Spin Crisis of the Proton, Preprinf IHEP, 1996.[8]B. L. Ioffe, Nucleon Spin Structure Sum Rule., Institute of Theoretical and Experimental Physics, Preprint ITEP / 62-95.[9]Wei-hsing Ma et al., Spin Dependent Structure Function of Proton, Submitted to Nucl. Phys. A., 1996.[10]Z. P. Li, F. E. Close, T. Barnes, Phys. Rev., D43(1991)2621.[11]L. A. Copey et al., Nucl. Phys., B13(1969)303; M. Wavs et al., Z Phys., C45(1990)613.[12]V. Barkert, Z. P. Li, Phys. Rev.; D47(1993)46.[13]Wei-hsing Ma, Lin Zhong, Q'-Dependence of Polarized Structure Function Integral at Low Momentum Transfer, Submitted to Nucl. Phys. A., 1996.[14]S. B. Gerasimov, Sov. J. Nucl. Phys., 2(1996)430; S. D. Drell, A. C. Hearn, Phys. Rev. Lett., 16(1966) 908.[15]S. A. Larin, Phys. Lett., B334(1994)192.[16]Masao Kuriki, preprint SLAC-482, UC-414, March 1996.[17]M. Bourquin et al., Z Phys., C21(1983)27; J. D. Bjorken, Phys. Rev., Dl(1970) 1376; Particle Data Group, Phys. Rev., D50(1994).[18]Particle Data Group, Phys. Rev., D590(1994); S. A. Larin, Phys. Lett., B334(1994)1992.[19]J. Ellis, R Jaffe, Phys. Rev., D9(1974)1444.
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Ma Weixing. Quark Polarization in Nucleon[J]. Chinese Physics C, 1997, 21(10): 946-952.
Ma Weixing. Quark Polarization in Nucleon[J]. Chinese Physics C, 1997, 21(10): 946-952. shu
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Received: 1900-01-01
Revised: 1900-01-01
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Quark Polarization in Nucleon

    Corresponding author: Ma Weixing,
  • Institute of High energy Physics, the Chinese AScademy of Sciences, beijing 100039

Abstract: Based on the relationship between electron induced deep inelastic scattering and forward virual photon compote scattering, the spin dependent structure function of nucleon and its first moment are expressed in terms of total absorption cross section of virtual photon which are calculated numerically in SU(6) quark model by use of helicity amplitudes. With the theoretical cross sections, the first moment of proton spin dependent structure function is predicted, and then quark polarization is deduced from the predicted moment. The experimental measurements of EMC and SLAC are reproduced thcoretically.

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