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University of Virginia, Charlottesville, VA 22901, USA.
Phys Rev Lett. 2003 Nov 28;91(22):222002. doi: 10.1103/PhysRevLett.91.222002. Epub 2003 Nov 25.
Double-polarization asymmetries for inclusive ep scattering were measured at Jefferson Lab using 2.6 and 4.3 GeV longitudinally polarized electrons incident on a longitudinally polarized NH3 target in the CLAS detector. The polarized structure function g(1)(x,Q2) was extracted throughout the nucleon resonance region and into the deep inelastic regime, for Q(2)=0.15-1.64 GeV2. The contributions to the first moment Gamma(1)(Q2)= integral g(1)(x,Q2) dx were determined up to Q(2)=1.2 GeV2. Using a parametrization for g(1) in the unmeasured low x regions, the complete first moment was estimated over this Q2 region. A rapid change in Gamma(1) is observed for Q2<1 GeV2, with a sign change near Q(2)=0.3 GeV2, indicating dominant contributions from the resonance region. At Q(2)=1.2 GeV2 our data are below the perturbative QCD evolved scaling value.
在杰斐逊实验室，利用能量为2.6 GeV和4.3 GeV的纵向极化电子入射到CLAS探测器中纵向极化的NH₃靶上，测量了包含性电子-质子散射的双极化不对称性。在整个核子共振区并进入深度非弹性区，提取了极化结构函数g(1)(x,Q²)，其中Q² = 0.15 - 1.64 GeV²。确定了直至Q² = 1.2 GeV²时对第一矩Gamma(1)(Q²)=∫g(1)(x,Q²)dx的贡献。利用未测量的低x区域中g(1)的参数化，估计了该Q²区域上的完整第一矩。观察到对于Q² < 1 GeV²，Gamma(1)有快速变化，在Q² = 0.3 GeV²附近有符号变化，表明共振区的贡献占主导。在Q² = 1.2 GeV²时，我们的数据低于微扰量子色动力学演化的标度值。
