E05-102 Experimental Status Report:

1. E05-102 Experimental Status Report: Vincent A. Sulkosky Massachusetts Institute of Technology Hall A Collaboration Meeting December 15, 2011

2. Physicsmotivation • Goal: understanding 3He ground-state spin structure helps in a variety ofexperiments that try to extract neutron information from3He • Theoretically: • nucleon-nucleon potential theory predicts three components in the 3He ground-state wave-function. • Understanding the role of the small components of the 3He ground-state wave function, S’ and D states, helps us understand the “standard model” of the few-body system • Double polarization measurements have large sensitivities to both S’ and D components

3. Deuterium Spin Structure • Spin-1 Particle, 2 spin-1/2Nucleons (Proton and Neutron) Angular Momentuml=0 l=2 ~90% ~10%

4. Asymmetry Measurements at NIKHEF • A sign flip of asymmetry with the increase of missing momentum gave an indication of the existence of D state • Sign flip happened at around Fermi momentum of deuterium nucleus I. Passchier et al., Phys. Rev. Lett. 88 (2002) 102302.

5. 3He spin structure • Spin-1/2 Particle, 3 spin-1/2 Nucleons (Proton and Neutron) • S’ mixed symmetry, (spin-isospin)-space correlations Effective Polarized Neutron Target Angular Momentuml=0 l=0 l=2 ~90% ~1-2% ~8%

6. Theoretical asymmetry fromFaddeev Calculation

7. 3HeExperiments X. Zheng et al., Phys. Rev. C 70, 065207(2004) • JLab experiment E99-117 measured neutron asymmetry A1n in the DIS region, the leading error other than statistical is caused by uncertainty in the effective proton and neutron polarization in 3He • New data at (almost) identical Q2 for simultaneously over a broad range of pmiss poses strong constraints on calculations

8. High Resolution Spectrometer (HRS): detected scattered electrons at 12.5º and 14.5º BigBite Spectrometer: • detected protons and deuterons with large acceptance at 75º and 82º • Two wire chambers and two scintillator planes

9. 3He Target • Hybrid K-Rb spin exchange optical pumping • High in-beam polarization: ~ 50-60% • Narrow band-width laser Preliminary

10. Separating Protons and Deuterons • 1-2% deuterons and rest are protons

11. BigBiteOptics: Sieve Slit

12. BigBiteOptics: Vertex Resolution: 1.6 cm over 40 cm Results to be submitted to NIM, M. Mihovilovič et al.

13. Preliminary Asymmetry Results • Longitudinal and transverse are with respect to the electron momentum. • Work by M. Mihovilovič Preliminary Preliminary Q2 = 0.37 GeV2 Q2 = 0.28 GeV2

14. Remaining Tasks • Correct final (minor) bugs in the analysis code regarding considered cuts. • Complete analysis of the proton asymmetries. Some of data were not analyzed yet due to a problem with zlib. • Do the deuteron analysis with the new analysis scripts. • Complete the systematic error analysis (false asymmetry corrections). We expect these corrections to be small. • Finalize the target polarizationin the scattering chamber. Need to consider the target orientation corrections, which are expected to be small.

15. Extraction of GEn at Q2=1 (GeV/c)2 by Measurements of • GEnwas extracted for the first time by inclusive polarized measurements from 3He • Getting the ratio of asymmetries in longitudinal and transverse target polarization; separating the electric and magnetic form factor contributions • Proton and neutron contributions calculated in PWIA • New technique, confirms previous measurements; uncertainty: ~18%, largely statistical

16. The ratio of asymmetries as functions of form factors • By measuring ATL’/AT’ and using GEp, GMn, and GMnas known parameters can one extract GEn

17. Final result of GEnat Q2=0.95 (GeV/c)2 • GEn/GD=0.226±0.041 (stat)±0.016 (syst) • GEn=0.0414±0.0077 (stat)±0.0032 (syst) Work by Jin Ge

18. Deuterium asymmetry: experiment and theories (N-N potential theory) 3He asymmetry: theories but no experiment until JLab experiment E05-102 Analysis ongoing and preliminary results are now available Papers: NIM article on BigBite Hadron package almost ready Inclusive measurement of GEnat Q2 ~ 1 (GeV/c)2 draft being edited. Summary

19. Graduate Students G. Jin, University of Virginia E. Long, Kent State University M. Mihovilovič, Jožef Stefan Institute Y. Zhang, Lanzhou University Run Coordinators A. Camsonne, Jefferson Lab P. Monaghan, Hampton University S. Riordan, University of Virginia B. Sawatzky, Temple University R. Subedi, University of Virginia V. Sulkosky, MIT Y. Qiang, Duke University B. Zhao, College of William and Mary Thanks to the Hall A Quasi-Elastic Family Experiments Spokespersons T. Averett, College of William and Mary (E05-015, E08-005) J. P. Chen, Jefferson Lab (E05-015) S. Gilad, MIT (E05-102) D. Higinbotham, Jefferson Lab (E05-102, E08-005) X. Jiang, Rutgers University (E05-015) W. Korsch, University of Kentucky (E05-102) B. E. Norum, University of Virginia (E05-102) S. Sirca, University of Ljubljana (E05-102) V. Sulkosky, MIT (E08-005) E05-015, E08-005, and E05-102 Collaboration F. Salvatore M. Shabestari A. Shahinyan B. Shoenrock J. St. John A. Tobias W. Tireman G. M. Urciuoli D. Wang K. Wang J. Watson B. Wojtsekhowski Z. Ye X. Zhan X. Zheng L. Zhu K. Allada B. Anderson J. R. M. Annand W. Boeglin P. Bradshaw M. Canan C. Chen R. De Leo X. Deng A. Deur C. Dutta L. El Fassi D. Flay F. Garibaldi H. Gao R. Gilman S. Golge O. Hansen T. Holmstrom J. Huang H. Ibrahim E. Jensen M. Jones H. Kang J. Katich C. W. Kees P. King J. LeRose R. Lindgren H. Lu W. Luo P. Markowitz M. Meziane R. Michaels B. Moffit N. Muangma H. P. Khanal K. Pan D. Parno E. Piasetzky M. Posik A. J. R. Puckett X. Qian X. Qui A. Saha

21. Helicity asymmetry in electron scattering where R’s are response functions and v’s are kinematics factors T. D. Donnelly and A. S. Raskin, Ann. Phys 169, 247 (1986)

22. Ratio of asymmetries

23. 3He inclusive response functions near quasi-elastic peak in PWIA Transverse- longitudinal: Transverse: where H’s are calculated by momentum distribution and nucleon polarization in 3He Proton: HpT’ Neutron: Hn Proton: HpTL’ A. Kievsky, E. Pace, G. Salme’ and M. Viviani, PRC 56 (1997) p.64