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Motivations

Motivations. Understand transition between partons and hadrons Study of higher twists Spin and flavor dependence of quark-hadron duality Access high x bj region if duality is demonstrated and well understood. Hint of duality. The E01-012 experiment.

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Motivations

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  1. Motivations • Understand transition between partons and hadrons • Study of higher twists • Spin and flavor dependence of quark-hadron duality • Access high xbj region if duality is demonstrated and well understood P. Solvignon, Duality Workshop

  2. Hint of duality P. Solvignon, Duality Workshop

  3. The E01-012 experiment Spokepeople:N. Liyanage, J-P. Chen, Seonho Choi Graduate Student: P. Solvignon • Ran in January-February 2003 • Inclusive experiment: 3He(e,e’)X • Measured polarized cross-sections differences and asymmetries • Form g1, g2, A1 andA2 for 3He • Test duality on the neutron SSF   P. Solvignon, Duality Workshop

  4. The experimental setup JLab HALL A • Polarized e- beam at 3, 4 and 5 GeV; Pavg =(773)% • Both HRS in symmetric config. at 25o and 32o: Double statistics  Control systematics • PID= Cerenkov + EM calo. /e reduced by 104(e-)>99% P. Solvignon, Duality Workshop

  5. Polarized 3He target Spin exchange between optically pumped Rb and 3He • Longitudinal and transverse configurations • High luminosity: 1036 s-1 cm-2 • 2 independent polarimetries: NMR and EPR P. Solvignon, Duality Workshop

  6. Data analysis  - - A//raw =  A raw=  + + • Generate asymmetries: • Measure unpolarized cross section: • Form polarized cross sections differences: • Can also get Born asymmetries: oborn = oraw- 2(N2/3He)N + R.C. //()raw = 2 A//()o //() = //()raw + R.C. A//()= //() / 2oborn P. Solvignon, Duality Workshop

  7. Polarized structure functions Extract g1 and g2 directly from our data MQ2 E 1 g1 =    4e2 E´ E +E´ (//+ tan(/2) ) (- //+ MQ22 1 g2=   4e2 2E´(E +E´) E + E´ cos  E´sin ) Need external input of R to form A1 and A2 A// A A1 =  -  D(1+) d(1+)  A//A A2 =  +  D(1+) d(1+) (D and d depend of R) P. Solvignon, Duality Workshop

  8. Elastic asymmetry P. Solvignon, Duality Workshop

  9. Asymmetries P. Solvignon, Duality Workshop

  10. Comparison of both HRS P. Solvignon, Duality Workshop

  11. Unpolarized cross sections P. Solvignon, Duality Workshop

  12. Polarized structure function g1 P. Solvignon, Duality Workshop

  13. Polarized structure function g1 P. Solvignon, Duality Workshop

  14. Polarized structure function g1 P. Solvignon, Duality Workshop

  15. Polarized structure function g1 P. Solvignon, Duality Workshop

  16. Polarized structure function g1 P. Solvignon, Duality Workshop

  17. Spin asymmetry A1 P. Solvignon, Duality Workshop

  18. Spin asymmetry A1 P. Solvignon, Duality Workshop

  19. Spin asymmetry A1 P. Solvignon, Duality Workshop

  20. Spin asymmetry A1 P. Solvignon, Duality Workshop

  21. Spin asymmetry A1 P. Solvignon, Duality Workshop

  22. Spin asymmetry A2 P. Solvignon, Duality Workshop

  23. Conclusion • E01-012 provides precision data of SSF on neutron (3He) for 1.0 < Q2 < 4.0 (GeV/c) 2 • Direct extraction of g1 andg2 from our data • Overlap between E01-012 resonance data and DIS test of Quark-hadron duality for neutron and nuclei SSF • E01-012 data combined with proton data  test of spin-flavor dependence of duality • Our data can also be used to extract moments of SSF (e.g. GDH sum rule, d2, BC sum rule) P. Solvignon, Duality Workshop

  24. Outlook Extraction of the neutron SSF Final results by the end of 2005 P. Solvignon, Duality Workshop

  25. Extra slides

  26. Polarized structure function g2 P. Solvignon, Duality Workshop

  27. Spin asymmetry A1 P. Solvignon, Duality Workshop

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