Spin Physics with CLAS
Inelastic scattering using polarized nucleon targets and polarized charged lepton beams allows the extraction of double and single spin asymmetries that provide information about the helicity structure of the nucleon. A program designed to study such processes at low and intermediate $Q^2$ for the proton and deuteron has been pursued by the CLAS Collaboration at Jefferson Lab since 1998. Our inclusive data with high statistical precision and extensive kinematic coverage allow us to better constrain the polarized parton distributions and to accurately determine various moments of spin structure function $$g_1$$ as a function of $Q^2$. The latest results will be shown, illustrating our contribution to the world data, with comparisons of the data with NLO global fits, phenomenological models, chiral perturbation theory and the GDH and Bjorken sum rules. The semi-inclusive measurements of single and double spin asymmetries for charged and neutral pions are also show, indicating the importance of the orbital motion of quarks in understanding the spin structure of the nucleon.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- AC05-06OR23177
- OSTI ID:
- 1004000
- Report Number(s):
- JLAB-PHY-10-1307; DOE/OR/23177-1416; TRN: US1100566
- Resource Relation:
- Conference: XIII Advanced Research Workshop on High Energy Spin Physics, DSPIN-09, 1-5 September 2009; Related Information: Published in proceedings of XIII Advanced Research Workshop on High Energy Spin Physics, DSPIN-09, page 292. Editors: A.V. Efremov, S.V. Goloskov, JINR, May 2010
- Country of Publication:
- United States
- Language:
- English
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