PPT Slide

“Proton Spin Crisis”

• Successful Description of Baryon mM by Quark Model

”quark carries all proton spin”

• Puzzling Data from polarized lepton-Nucleon scattering

DS : total quark spin contribution to the proton spin

Ds: strange quark contribution to the proton spin

• Fixes for ”Spin Crisis”
  • Gluon is polarized : DG > 0
  • Anti-quark is polarized: indirect decomposition suggests Dsɘ
  • Steeper small-x

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