The deuteron spin-dependent structure function g1d and its first moment
The deuteron spin-dependent structure function g1d and its first moment
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DOI：
10.1016/j.physletb.2006.12.076
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发表时间：
2006-09
影响因子：
4.4
通讯作者：
The Compass Collaboration;V. Alexakhin;E. al.
中科院分区：
文献类型：
--
作者：
The Compass Collaboration;V. Alexakhin;E. al.
利用2002-2004年在欧洲核子研究中心（CERN）进行的COMPASS实验所收集到的数据，对氘自旋相关结构函数g1 d进行了测量.这些数据提供了对Γ 1d（g1 d（x）的一阶矩）和单线态轴向电流的矩阵元a0的准确评估。最后给出了对所有g1深度非弹性散射数据的次领先阶（NLO）QCD拟合结果。它们给出了两种胶子自旋分布函数ΔG为正或为负的解，这两种解同样能很好地描述数据。在这两种情况下，当Q ~ 2 =3（GeV/c）~ 2时，ΔG（x）的一阶矩的绝对值为0.2-0.3。
We present a measurement of the deuteron spin-dependent structure function g1dbased on the data collected by the COMPASS experiment at CERN during the years 2002–2004. The data provide an accurate evaluation for Γ1d, the first moment of g1d(x), and for the matrix element of the singlet axial current, a0. The results of QCD fits in the next to leading order (NLO) on all g1deep inelastic scattering data are also presented. They provide two solutions with the gluon spin distribution function ΔG positive or negative, which describe the data equally well. In both cases, at Q2=3(GeV/c)2the first moment of ΔG(x) is found to be of the order of 0.2–0.3 in absolute value.