Study of the polarized structure functions of the neutron at low Q**2 using polarized He-3

Conference · Wed Jun 02 04:00:00 EDT 2004

OSTI ID:883229

Choi, S H

We have measured the electron-He-3 longitudinal and transverse spin dependent inclusive cross sections {pol}He-3({pol}e, e-prime), mostly in the resonance region (up to W ~ 2.5 GeV), over a wide range of four-momentum transfer (Q**2 = 0.03 - 1GeV**2). The longitudinally polarized electron beam of energy ranging from 0.86 to 5.1 GeV of the Jefferson Lab was scattered at a fixed angle of 15.5 degrees, on a high pressure polarized He-3 target in Hall A. The spin dependent structure functions g_1(x), g_2(x) have been extracted and their moments were evaluated. The GDH integral shows dramatic transition from large Q**2 domain to low Q**2 domain in the Burkhardt-Cottingham sum rule for g_2 seems to hold within experimental errors. d_2 is quite large and positive consistent with the SLAC data but at odds with lattice QCD calculation.

• Research Organization: Thomas Jefferson National Accelerator Facility, Newport News, VA
• Sponsoring Organization: USDOE - Office of Energy Research (ER)
• DOE Contract Number: AC05-84ER40150
• OSTI ID: 883229
• Report Number(s): JLAB-PHY-04-205; DOE/ER/40150-3915
• Country of Publication: United States
• Language: English