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Flavor Separated Quark Polarizations at HERMES

Flavor Separated Quark Polarizations at HERMES. W. Lorenzon (Michigan) NAPP 2003, Dubvrovnik, Croatia Collaboration 28 May 2003. Flavor structure of proton – some phenomenological models Flavor tagging and purity analysis Experimental results Summary and Outlook ….

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Flavor Separated Quark Polarizations at HERMES

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  1. Flavor Separated Quark Polarizations at HERMES W. Lorenzon (Michigan) NAPP 2003, Dubvrovnik, Croatia Collaboration 28 May 2003 • Flavor structure of proton – some phenomenological models • Flavor tagging and purity analysis • Experimental results • Summary and Outlook …

  2. Flavor Structure of the Proton

  3. Flavor Structure of the Proton - II

  4. Spin Structure of the Proton

  5. Polarized Deep-Inelastic Scattering

  6. Comparison of Data for g1(x) • From NLO-QCD analysis of inclusive DIS measurements…SMC, PRD 58 (1998) 112002(in AB scheme) • Ds = -0.02 to –0.15 (model dependent) slight neg. sea-quark polarization? • What about Dq? (inclusive DIS gives no answer)

  7. Anti-quark Spin in the Proton

  8. Quark Polarization from Semi-Inclusive DIS

  9. Is HERMES Fragmentation “Universal”?

  10. Purity Analysis of Asymmetries

  11. Generation of Purities

  12. Purities

  13. Semi-Inclusive Asymmetries

  14. Latest Dq Results from HERMES

  15. (A)symmetry of Polarized Light Quark Sea

  16. Isoscalar Extraction of Ds

  17. Summary and Outlook

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