Yi Qiang Duke University for SPIN 2008 Conference Oct 9, 2008

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Presentation transcript:

Yi Qiang Duke University for SPIN 2008 Conference Oct 9, 2008 Measurement of Single Target-Spin Asymmetry in Semi-Inclusive Pion Electroproduction on a Transversely Polarized 3He Target Yi Qiang Duke University for SPIN 2008 Conference Oct 9, 2008 Transversity in JLab Hall A Spin 2008 Conference 10/9/2008

Transversity Experiments in Hall A E06-010: Single Target-Spin Asymmetry in Semi-Inclusive n↑(e, e’p+/-) Reaction on a Transversely Polarized 3He Target Spokespersons: Xiaodong Jiang (Rutgers, Contact Person), Jian-ping Chen (JLab), Evaristo Cisbani (INFN-Rome), Haiyan Gao (Duke), Jen-Chieh Peng (UIUC) Thesis Students: C. Dutta (Kentucky), A. Kalyan (Kentucky), X. Qian (Duke), Y. Wang (UIUC), Y. Zhang (Lanzhou U), J. Huang (MIT) Approved with A rating, total beam time of 29 days, will run in fall 2008 10/9/2008 Transversity in JLab Hall A Spin 2008 Conference

Collaboration members E06-010 Collaboration Institutions California State Univ., Duke Univ., Florida International. Univ., Univ. Illinois, JLab, Univ. Kentucky, LANL, Univ. Maryland, Univ. Massachusetts, MIT, Old Dominion Univ., Rutgers Univ., Temple Univ., Penn State Univ., Univ. Virginia, College of William & Mary, Univ. Sciences & Tech, China Inst. Of Atomic Energy, Beijing Univ., Seoul National Univ., Univ. Glasgow, INFN Roma and Univ. Bari, Univ. of Ljubljana, St. Mary’s Univ., Tel Aviv Univ. Collaboration members A.Afanasev, K. Allada, J. Annand, T. Averett, F. Benmokhtar, W. Bertozzi, F. Butaru, G. Cates, C. Chang, J.-P. Chen (Co-SP), W. Chen, S. Choi, C. Chudakov, E. Cisbani(Co-SP), E. Cusanno, R. De Leo, A. Deur, C. Dutta, D. Dutta, R. Feuerbach, S. Frullani, L. Gamberg, H. Gao(Co-SP), F. Garibaldi, S. Gilad, R. Gilman, C. Glashausser, J. Gomez, M. Grosse-Perdekamp, D. Higinbotham, T. Holmstrom, D. Howell, J. Huang, M. Iodice, D. Ireland, J. Jansen, C. de Jager, X. Jiang (Co-SP), Y. Jiang, M. Jones, R. Kaiser, A. Kalyan, A. Kelleher, J. Kellie, J. Kelly, A. Kolarkar, W. Korsch, K. Kramer, E. Kuchina, G. Kumbartzki, L. Lagamba, J. LeRose, R. Lindgren, K. Livingston, N. Liyanage, H. Lu, B. Ma, M. Magliozzi, N. Makins, P. Markowitz, Y. Mao, S. Marrone, W. Melnitchouk, Z.-E. Meziani, R. Michaels, P. Monaghan, S. Nanda, E. Nappi, A. Nathan, V. Nelyubin, B. Norum, K. Paschke, J. C. Peng(Co-SP), E. Piasetzky, M. Potokar, D. Protopopescu, X. Qian, Y. Qiang, B. Reitz, R. Ransome, G. Rosner, A. Saha, A. Sarty, B. Sawatzky, E. Schulte, S. Sirca, K. Slifer, P. Solvignon, V. Sulkosky, P. Ulmer, G. Urciuoli, K. Wang, Y. Wang, D. Watts, L. Weinstein, B. Wojtsekhowski, H. Yao, H. Ye, Q. Ye, Y. Ye, J. Yuan, X. Zhan, Y. Zhang, X. Zheng, S. Zhou. 10/9/2008 Transversity in JLab Hall A Spin 2008 Conference

Leading Twist Quark Distributions Eight Parton Distribution Functions 10/9/2008 Transversity in JLab Hall A Spin 2008 Conference

Access Parton Distributions through Semi-Inclusive DIS Unpolarized Boer-Mulder Transversity Polarized Target Sivers Pretzelosity Polarized Beam and Target SL, ST: Target Polarization; le: Beam Polarization 10/9/2008 Transversity in JLab Hall A Spin 2008 Conference

E06-010 SIDIS on Polarized 3He neutron Target 10/9/2008 Transversity in JLab Hall A Spin 2008 Conference

Jefferson Lab Experiment Halls Ebeam = 6 GeV Pbeam = 85% 10/9/2008 Transversity in JLab Hall A Spin 2008 Conference

Transversity in JLab Hall A Spin 2008 Conference Experiment Setup Polarized 3He Target, 10 atm pressure. With 10 uA beam: L(n) = 1036 cm-2 s-1 HRSL at 16 degrees as hadron arm. P = 2.4 GeV/c BigBite at 30 degrees as electron arm. DW = 64 msr e e’ p g* HRSL BigBite 16o 30o Polarized 3He Target 10/9/2008 Transversity in JLab Hall A Spin 2008 Conference

Hall A Polarized 3He Target Optical Pumping System High Luminosity: L = 1036 cm-1s-1 (world record) K-Rb Hybrid Cell High polarization: P ~ 45% with beam and 100 W diode laser array Short Pumping Up Time: 2-6 hours 10/9/2008 Transversity in JLab Hall A Spin 2008 Conference

Upgrade for Transversity New vertical coil together with existing horizontal coils and new oven allow 3He to be polarized in ALL three directions! New narrow band COMET lasers make optical pumping more efficient: ~70% polarization without beam and expecting >60% polarization with beam. New optics/control system to allow frequent spin flips. 10/9/2008 Transversity in JLab Hall A Spin 2008 Conference

Transversity in JLab Hall A Spin 2008 Conference Spin Flip/Rotation Target spin will be rotated to increase the Fsl coverage: Total beam time splits into vertical and transverse periods. Target spin gets flipped every 20 minutes, driven by RF to reduce systematic error. 10/9/2008 Transversity in JLab Hall A Spin 2008 Conference

Transversity in JLab Hall A Spin 2008 Conference Kinematic Coverage E-arm at θ=30°. 0.5 < E’ < 2.2 GeV. 0.13 < x < 0.405, covers the valence-quark region. 1.3 < Q2 < 3.1 (GeV/c)2. 2.33 < W < 3.05 GeV/c2, above the resonance region. 10/9/2008 Transversity in JLab Hall A Spin 2008 Conference

Transversity in JLab Hall A Spin 2008 Conference Kinematic Coverage H-arm at θ= 16°, measure charged hadrons with p = 2.4 GeV/c. The fraction of the energy transfer carried by the hadrons, z = Eh /ν, is about 0.5 , selecting leading hadrons in the current fragmentation. Missing mass W ’ > 1.5 GeV/c2 to stay away from the resonance production region. Pt cover to ~ 0.5 GeV/c. 10/9/2008 Transversity in JLab Hall A Spin 2008 Conference

Separation of Collins and Sivers effects through angular dependence 10/9/2008 Transversity in JLab Hall A Spin 2008 Conference

Coverage of the Collins Angle Fsl=0o (black), Fsl=90o (red), Fsl=180o (blue), Fsl=270o (purple) <x>=0.135 <x>=0.315 <x>=0.225 <x>=0.405 10/9/2008 Transversity in JLab Hall A Spin 2008 Conference

Coverage of the Sivers Angle Fsl=0o (black), Fsl=90o (red), Fsl=180o (blue), Fsl=270o (purple) <x>=0.135 <x>=0.315 <x>=0.225 <x>=0.405 10/9/2008 Transversity in JLab Hall A Spin 2008 Conference

Collins Asymmetry on neutron Model Assumptions: 10/9/2008 Transversity in JLab Hall A Spin 2008 Conference

Collins Asymmetry on neutron Small Collins Asymmetry with JLab 6 GeV? 10/9/2008 Transversity in JLab Hall A Spin 2008 Conference

Sivers Asymmetry on neutron <Q2>=2.2 (GeV/c)2 Considering that Compass and Hermes did not get consistent proton Sivers, our measurement may help to understand the issue. 10/9/2008 Transversity in JLab Hall A Spin 2008 Conference

Sivers Asymmetry on neutron <Q2>=2.2 (GeV/c)2 10/9/2008 Transversity in JLab Hall A Spin 2008 Conference

Transversity in JLab Hall A Spin 2008 Conference Status of E06-010 Installation started June 9th. A BigBite detector test run conducted May 2008. Both 3He target and detector preparation are under going. No major problems so far. Two weeks to start commissioning and data taking: Oct 24, 2008 – Feb 5, 2009! Will parasitically take data on Single Arm Single Spin Asymmetry and Double Spin Asymmetry. 10/9/2008 Transversity in JLab Hall A Spin 2008 Conference

Transversity in JLab Hall A Spin 2008 Conference Summary First measurement of neutron transversity from polarized 3He Target. Data will cover valence range, x = 0.13~0.405. High luminosity and statistics. Absolute error on neutron pion asymmetries is about 3%~5%. Seeing beam really soon! Will also have data on double spin asymmetries and single arm single spin asymmetry. 10/9/2008 Transversity in JLab Hall A Spin 2008 Conference

Double Spin Asymmetry g1T g1T : the quark longitudinal polarization in a transversely polarized nucleon. We expect to measure ALT at 4 kinematics points together transversity. 10/9/2008 Transversity in JLab Hall A Spin 2008 Conference

Transversity in JLab Hall A Spin 2008 Conference ALT in E06-010 Transversity Error is estimated to be So, Expected Error is about 3% to 5% for x=0.14 to 0.40 10/9/2008 Transversity in JLab Hall A Spin 2008 Conference

Transversity in JLab Hall A Spin 2008 Conference Water NMR Calibration 10 Sweeps 2500 Sweeps 10/9/2008 Transversity in JLab Hall A Spin 2008 Conference