Spin Structure of the Nucleon

• Studied with Deep Inelastic Scattering of polarized lepton from polarized nucleon (pol-DIS) → proton spin crisis

• DS = 0.3 Ds=-0.10

• Pol-DIS

  • well-defined kinematics
  • sensitive to only eq2
    • analysis assume flavor SU(3)

Quark Spin: DS
valence quark: Duv,Ddv

sea quark:

Quark Orbital Motion:Lq

Gluon Spin:DG

Gluon Orbital Motion:Lg

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