The double spin asymmetry in exclusive pi+ electro-production with CLAS
The eg1b run was conducted using CLAS at Jefferson Lab in 2000 by the CLAS collab- oration. A 1.6 GeV - 5.6 GeV polarized electron beam and polarized nuclear targets (composed of NH3 and ND3) were used, allowing single and double spin asymmetries to be measured. This analysis deals with the double spin asymmetry A || in the exclusive production of positive pions from a polarized proton (ep ? e?+n). The double spin asymmetry was measured as a function of the four kinematic variables W , Q2, cos ?? , and ??. The value of this asymmetry can be used to help determine the spin structure of the resonances, due to its sensitivity to the spin dependent parts of the cross section. A brief description of the experimental setup will be given, and preliminary results for the asymmetry will be shown.
- Research Organization:
- Thomas Jefferson Lab National Accelerator Facility
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 955723
- Report Number(s):
- JLAB-PHY-07-772; 7545053; DOE/OR/23177-0395
- Country of Publication:
- United States
- Language:
- English
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