Flavor Decomposition of Nucleon Spin Structure: A Proposed Experiment at Jefferson Lab Hall C
We propose to measure the semi-inclusive double-spin asymmetries in deep-inelastic (,eh)X and (,eh)X reactions (h = +, -, K+ and K-) on longitudinally polarized NH3 and LiD targets. The high statistic data will allow a leading order five-flavor decomposition (Delta u, Delta d, Delta u, Delta d, Delta s ) of the nucleon spin structure in the region of x = 0.12 {approx} 0.43 at a Q2 of 1.21 {approx} 3.22 GeV2. The combined spin dependent pi+ + pi- yield ratios will be measured, since the acceptance and the hadron efficiencies of the detectors can be accurately determined. Independent of fragmentation functions and parton distributions, the z-dependence (z = 0.38 {approx} 0.71) of the combined ratios provides a build-in test of factorization at the moderate Q2. We estimate statistical uncertainties associated with such measurements.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- AC05-84ER40150
- OSTI ID:
- 824811
- Report Number(s):
- JLAB-PHY-04-14; DOE/ER/40150-2715; TRN: US0402219
- Resource Relation:
- Conference: 8th Conference On The Intersections Of Particle And Nuclear Physics (CIPANP 2003), New York, NY (US), 05/19/2003--05/24/2003; Other Information: PBD: 1 Feb 2004
- Country of Publication:
- United States
- Language:
- English
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