低Q2时中子自旋结构函数g2(n)的Q2依赖性。
Q2 dependence of the neutron spin structure function g2(n) at low Q2.
作者信息
Kramer K, Armstrong D S, Averett T D, Bertozzi W, Binet S, Butuceanu C, Camsonne A, Cates G D, Chen J-P, Choi Seonho, Chudakov E, Cusanno F, Deur A, Djawotho P, Dutta D, Finn J M, Gao H, Garibaldi F, Gayou O, Gilman R, Glamazdin A, Gorbenko V, Griffioen K A, Hansen J-O, Higinbotham D W, Hinton W, Horn T, de Jager C W, Jiang X, Korsch W, LeRose J, Lhuillier D, Liyanage N, Margaziotis D J, McCormick K, Meziani Z-E, Michaels R, Milbrath B, Moffit B, Nanda S, Perdrisat C F, Pomatsalyuk R, Punjabi V, Reitz B, Roche J, Roché R, Roedelbronn M, Savvinov N, Secrest J, Singh J, Sirca S, Slifer K, Solvignon P, Steiner D J, Suleiman R, Sulkosky V, Tobias A, Vacheret A, Xiao Y, Zheng X, Zhou J, Zhu L, Zhu X, Zołnierczuk P A
机构信息
College of William and Mary, Williamsburg, Virginia 23187, USA.
出版信息
Phys Rev Lett. 2005 Sep 30;95(14):142002. doi: 10.1103/PhysRevLett.95.142002. Epub 2005 Sep 29.
We present the first measurement of the Q2 dependence of the neutron spin structure function g2(n) at five kinematic points covering 0.57 (GeV/c)2 < or = Q2 < or = 1.34 (GeV/c)2 at x approximately = 0.2. Though the naive quark-parton model predicts g2 = 0, nonzero values occur in more realistic models of the nucleon which include quark-gluon correlations, finite quark masses, or orbital angular momentum. When scattering from a noninteracting quark, g2(n) can be predicted using next-to-leading order fits to world data for g1(n). Deviations from this prediction provide an opportunity to examine QCD dynamics in nucleon structure. Our results show a positive deviation from this prediction at lower Q2, indicating that contributions such as quark-gluon interactions may be important. Precision data obtained for g1(n) are consistent with next-to-leading order fits to world data.
我们展示了在x约为0.2时，在五个运动学点上对中子自旋结构函数g2(n)的Q2依赖性的首次测量，这些点覆盖0.57(GeV/c)2≤Q2≤1.34(GeV/c)2。尽管朴素夸克-部分子模型预测g2 = 0，但在更现实的核子模型中会出现非零值，这些模型包括夸克-胶子关联、有限夸克质量或轨道角动量。当从非相互作用夸克散射时，可以使用对g1(n)的世界数据的次领头阶拟合来预测g2(n)。与该预测的偏差为研究核子结构中的量子色动力学（QCD）动力学提供了机会。我们的结果表明，在较低的Q2下，与该预测存在正偏差，这表明夸克-胶子相互作用等贡献可能很重要。为g1(n)获得的精确数据与对世界数据的次领头阶拟合一致。
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