B. Povh, MPIK Heidelberg Th. Walcher, Uni Mainz

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Presentation transcript:

B. Povh, MPIK Heidelberg Th. Walcher, Uni Mainz The Nucleon Spin in DIS B. Povh, MPIK Heidelberg Th. Walcher, Uni Mainz

Conflict Constituent Quark Model DIS ΔΣ≈0.6 ΔΣ=0.33±…

In the Constituent Quark Model ΔΣ follows from gA gA = 5/3 1.27 Only 80% of the Constituent Quark is active in the np+e-+ consequently ΔΣ=0.6

DIS for ΔxB intervals It would be correct if the nucleon had only 3 valence quarks and not any pairs. ΔΣ=0.33±… in EMC, SMC, NMC, Hermes, Slac

Intrinsic quark sea Gottfried Sum Rule DIS with the forward neutron DIS with the forward proton

DIS with forward neutron Both violation of Gottfried Sum Rule and forward neutron in DIS. Pion probability in the nucleon is 25%.

DIS with forward proton

DIS with forward proton

Conclusion The polarization ΔΣ≈0.6 of the quark model and the polarization ΔΣ=0.33 requires the average number of quarks and antiquarks in the nucleon to be about 4.5. This number is a lower limit!