Anti-quark Helicity Distribution

• Drell-Yan Production of lepton pairs

  • maximal parton level asymmetry: aLL= -1
  • possible severe background from semi-leptonic decays of open charm productions

• W production

  • helicity of quarks definitely defined via V-A nature
  • flavor almost fixed: flavor analysis possible
  • PHENIX-Muon Arms, EMcal important

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