P. Solvignon, Duality Workshop

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Presentation transcript:

P. Solvignon, Duality Workshop 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 Frascati, June 6, 2005 P. Solvignon, Duality Workshop P. Solvignon, Duality workshop

P. Solvignon, Duality Workshop Hint of duality Frascati, June 6, 2005 P. Solvignon, Duality Workshop P. Solvignon, Duality workshop

P. Solvignon, Duality Workshop 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 and A2 for 3He Test duality on the neutron SSF   Frascati, June 6, 2005 P. Solvignon, Duality Workshop P. Solvignon, Duality workshop

The experimental setup 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% JLab HALL A Frascati, June 6, 2005 P. Solvignon, Duality Workshop

P. Solvignon, Duality Workshop 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 Frascati, June 6, 2005 P. Solvignon, Duality Workshop

P. Solvignon, Duality Workshop 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 Frascati, June 6, 2005 P. Solvignon, Duality Workshop

(// + tan(/2)  ) (- // + 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) Frascati, June 6, 2005 P. Solvignon, Duality Workshop

P. Solvignon, Duality Workshop Elastic asymmetry Frascati, June 6, 2005 P. Solvignon, Duality Workshop

P. Solvignon, Duality Workshop Asymmetries Frascati, June 6, 2005 P. Solvignon, Duality Workshop

P. Solvignon, Duality Workshop Comparison of both HRS Frascati, June 6, 2005 P. Solvignon, Duality Workshop P. Solvignon, Duality workshop

Unpolarized cross sections Frascati, June 6, 2005 P. Solvignon, Duality Workshop

Polarized structure function g1 Frascati, June 6, 2005 P. Solvignon, Duality Workshop

Polarized structure function g1 Frascati, June 6, 2005 P. Solvignon, Duality Workshop

Polarized structure function g1 Frascati, June 6, 2005 P. Solvignon, Duality Workshop

Polarized structure function g1 Frascati, June 6, 2005 P. Solvignon, Duality Workshop

Polarized structure function g1 Frascati, June 6, 2005 P. Solvignon, Duality Workshop

P. Solvignon, Duality Workshop Spin asymmetry A1 Frascati, June 6, 2005 P. Solvignon, Duality Workshop

P. Solvignon, Duality Workshop Spin asymmetry A1 Frascati, June 6, 2005 P. Solvignon, Duality Workshop

P. Solvignon, Duality Workshop Spin asymmetry A1 Frascati, June 6, 2005 P. Solvignon, Duality Workshop

P. Solvignon, Duality Workshop Spin asymmetry A1 Frascati, June 6, 2005 P. Solvignon, Duality Workshop

P. Solvignon, Duality Workshop Spin asymmetry A1 Frascati, June 6, 2005 P. Solvignon, Duality Workshop

P. Solvignon, Duality Workshop Spin asymmetry A2 Frascati, June 6, 2005 P. Solvignon, Duality Workshop

P. Solvignon, Duality Workshop Conclusion E01-012 provides precision data of SSF on neutron (3He) for 1.0 < Q2 < 4.0 (GeV/c) 2 Direct extraction of g1 and g2 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) Frascati, June 6, 2005 P. Solvignon, Duality Workshop

P. Solvignon, Duality Workshop Outlook Extraction of the neutron SSF Final results by the end of 2005 Frascati, June 6, 2005 P. Solvignon, Duality Workshop

Extra slides

Polarized structure function g2 Frascati, June 6, 2005 P. Solvignon, Duality Workshop

P. Solvignon, Duality Workshop Spin asymmetry A1 Frascati, June 6, 2005 P. Solvignon, Duality Workshop