Title:   Spin Structure in the Resonance Region
Speaker: Shigeyuki Tajima, University of Virginia
Time:    1pm Thursday, October 19, 2006
Place:   TA-53, Bldg 1, room A234

Abstract:
The Jefferson Lab (JLab) RSS collaboration performed a precise measurement
of the spin structure functions of the proton and deuteron in the region
of nucleon resonances (W<2 GeV) at the average four-momentum transfer
squared of Q2=1.3 (GeV/c)2. The longitudinally-polarized electron beam
of 5.755 GeV energy was scattered from a polarized solid target in Hall C
of JLab. Ordinary (NH3) and deuterated (ND3) ammonia were used as
polarized proton and deuteron targets, respectively. The scattered
electrons were detected in High Momentum Spectrometer (HMS). Measurement
of the beam-target asymmetries (A_parallel and A_perp) with the target
polarization being parallel or perpendicular to the beam direction allows
us to determine the spin asymmetries (A1(W,Q2) and A2(W,Q2)) and the
spin structure functions (g1(x,Q2) and g2(x,Q2)) in a model independent
way. The W dependence of A1 and A2 were measured with high resolution,
allowing for clear identification of individual resonance regions. The
data provide a test of local duality in the polarized structure functions
and allow an examination of higher twist effects. From the proton and
deuteron data, spin structure functions of the neutron are also extracted.
  In this talk, proton results as well as preliminary deuteron and
neutron results will be presented.