Yi Qiang Duke University for APS April Meeting 2009 May 4, 2009

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Presentation transcript:

Yi Qiang Duke University for APS April Meeting 2009 May 4, 2009 Measurement of Single Target-Spin Asymmetry in Semi-Inclusive Pion Electroproduction on a Transversely Polarized 3He Target Yi Qiang Duke University for APS April Meeting 2009 May 4, 2009 Transversity in JLab Hall A APS April Meeting 2009 5/4/2009

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/Los Alamos, Contact Person), Jian-ping Chen (JLab), Evaristo Cisbani (INFN-Rome), Haiyan Gao (Duke), Jen-Chieh Peng (UIUC) Thesis Students: C. Dutta (Kentucky), J. Huang (MIT), A. Kalyan (Kentucky), J. Katich (W&M), X. Qian (Duke), Y. Wang (UIUC), Y. Zhang (Lanzhou U) Approved with A rating and was just finished in early February, 2009. 5/4/2009 Transversity in JLab Hall A APS April Meeting 2009

Access Leading Twist Parton Distributions through Semi-Inclusive DIS Unpolarized Boer-Mulder Measured by E06-010 Transversity Polarized Target Sivers Measured as well see Jin Huang’s talk Pretzelosity Polarized Beam and Target SL, ST: Target Polarization; le: Beam Polarization 5/4/2009 Transversity in JLab Hall A APS April Meeting 2009

Transversity in JLab Hall A APS April Meeting 2009 Experiment Setup Electron Beam: E = 5.9 GeV HRSL at 16 degrees as hadron arm: P = 2.4 GeV/c BigBite at 30 degrees as electron arm: P = 0.5 ~ 2.2 GeV/c Measure Collins, Sivers and pretzelosity asymmetries in valence range: x = 0.13 ~ 0.41 e e’ p g* HRSL BigBite 16o 30o Polarized 3He Target 5/4/2009 Transversity in JLab Hall A APS April Meeting 2009

Transversity in JLab Hall A APS April Meeting 2009 Polarized 3He Target EPR Water NMR Auto spin flip every 20 minutes High Polarization with 3x25 W narrow band COMET lasers: p ~ 65% (~70% Max) Good Polarimetries Calibration: EPR and Water NMR Cell: Astral Cell: Maureen see Chiranjib Dutta’s Talk for more details 5/4/2009 Transversity in JLab Hall A APS April Meeting 2009

Reconstructed Pattern BigBite Spectrometer Wire chamber survives at 45MHz rate with 13.5 uA beam Spatial resolution: 180um Clean e/p separation with Shower/Pre-shower See Kalyan Allada’s talk for more details Sieve Plate p e Reconstructed Pattern With BigBite OFF Chamber Hit Efficiency 5/4/2009 Transversity in JLab Hall A APS April Meeting 2009

Left High Resolution Spectrometer Clean e/p separation with Gas Cherenkov and Pion Rejector Good time resolution from S2m scintillator plane: < 600 ps Promising K/p separation with A1 and RICH detectors Cherenkov Ring from RICH 4.5s Separation Raw S2m time 5/4/2009 Transversity in JLab Hall A APS April Meeting 2009

Transversity in JLab Hall A APS April Meeting 2009 Separation of Collins, Sivers and Pretzelosity effects through angular dependence Transversity Sivers Pretzelosity 5/4/2009 Transversity in JLab Hall A APS April Meeting 2009

Projections of Collins and Sivers Functions 5/4/2009 Transversity in JLab Hall A APS April Meeting 2009

Transversity in JLab Hall A APS April Meeting 2009 Status of E06-010 The experiment was smoothly performed from Oct 2008 to Feb 2009. Statistics achieved the proposed goal. Detector calibrations and target analysis are ongoing. Will start to extract physical asymmetries afterwards. 5/4/2009 Transversity in JLab Hall A APS April Meeting 2009

Transversity in JLab Hall A APS April Meeting 2009 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 preliminary result really soon! Measured single arm single spin asymmetry, see Joe Katich’s talk. 5/4/2009 Transversity in JLab Hall A APS April Meeting 2009

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. 5/4/2009 Transversity in JLab Hall A APS April Meeting 2009