1 / 15

Measurement of Target Single Spin Asymmetry in Quasi-elastic 3 He (e, e’)

Measurement of Target Single Spin Asymmetry in Quasi-elastic 3 He (e, e’). (Updates on Ay experiment E05-015). Bo Zhao College of William and Mary For the Hall-A Quasi-elastic collaboration. 1. l'. l. H. P' q. P q. N'. N. k. k. k'. k'. P q. P q. P' q. P' q.

hannah-golden
Download Presentation

Measurement of Target Single Spin Asymmetry in Quasi-elastic 3 He (e, e’)

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Measurement of Target Single Spin Asymmetry in Quasi-elastic 3He (e, e’) (Updates on Ay experiment E05-015) Bo Zhao College of William and Mary For the Hall-A Quasi-elastic collaboration 1

  2. l' l H P'q Pq N' N k k k' k' Pq Pq P'q P'q Two-photon Exchange progress 2

  3. For Target Single Spin Asymmetry (SSA) In terms of GPD moments Y.C. Chen etc., PRL 93, 122301 (2004) A measurement of Ay has sensitivity to GPD model input 3

  4. Expected result -1.35 Theoretical prediction 4

  5. Experimental Facility 5

  6. Ay Kinematics This Ay experiment (E05-015) was run from April 26th to May 12th The Kinematics of this Ayexperiment: 6

  7. Electron Identification 7 Nphe (ADCs)

  8. T1 scalar asymmetry between L and R Positive target spin Run number Negative target spin Run number 8

  9. T3 scalar asymmetry between L and R Positive target spin Run number Negative target spin Run number 9

  10. u3 scalar asymmetry between L and R Positive target spin Run number Negative target spin 10 Run number

  11. Preliminary raw SSA Preliminary 11

  12. Summary and future plan Preliminary raw SSA at Q2 = 0.98 is non-zero and consistent between L-arm data and R-arm data. An independent cross-check was being carried by E. Long. Target analysis by Y. Zhang was almost completed. Raw SSA at Q2 = 0.13 and Q2= 0.46 is almost finished and will be released soon after an independent cross-check. Systematic uncertainty study Raw SSA 3He SSA neutron SSA with dilution factor, target polarization and so on. 12

  13. 13

  14. Preliminary 14

  15. 15

More Related