The spin-dependent structure function of the proton g(1)(p) and a test of the Bjorken sum rule
The spin-dependent structure function of the proton g(1)(p) and a test of the Bjorken sum rule
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DOI：
10.1016/j.physletb.2010.05.069
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发表时间：
2010-01
影响因子：
4.4
通讯作者：
T. C. C. A. Alekseev-T.-C.-C.-A.-Alekseev-102393709;E. al.
中科院分区：
文献类型：
--
作者：
T. C. C. A. Alekseev-T.-C.-C.-A.-Alekseev-102393709;E. al.
包容性双自旋不对称性，A1 p，已被测量在COMPASS在深非弹性极化μ子散射了一个大的极化NH3目标。2007年收集的数据涵盖Q2>1（GeV/c）2，0.004<x<0.7的范围，并在x<0.02的区域将g1 p（x）的统计精度提高了两倍。新的质子不对称性与先前发表的氘核提取非单线态自旋相关的结构函数g1 NS（x，Q2）相结合。等矢量夸克密度Δq3（x，Q2）由g1 NS的非线性光学QCD拟合计算。一阶矩Δ q3与Bjorken求和规则的预测值符合得很好，并对应于轴向耦合常数与矢量耦合常数的比值|gA/gV| =1.28±0.07（统计）±0.10（系统）。
The inclusive double-spin asymmetry, A1p, has been measured at COMPASS in deep-inelastic polarised muon scattering off a large polarised NH3target. The data, collected in the year 2007, cover the range Q2>1(GeV/c)2, 0.004<x<0.7 and improve the statistical precision of g1p(x) by a factor of two in the region x<0.02. The new proton asymmetries are combined with those previously published for the deuteron to extract the non-singlet spin-dependent structure function g1NS(x,Q2). The isovector quark density, Δq3(x,Q2), is evaluated from a NLO QCD fit of g1NS. The first moment of Δq3is in good agreement with the value predicted by the Bjorken sum rule and corresponds to a ratio of the axial and vector coupling constants |gA/gV|=1.28±0.07(stat.)±0.10(syst.).