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arXiv 1201.6337hep-phnucl-th
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核子中的自旋和angular momentum

Spin and angular momentum in the nucleon

Franz Gross, G. Ramalho, M. T. Pena

摘要:

利用协变旁观者理论(CST),给出了用价夸克-双夸克模型计算非偏振深度非弹性散射(DIS)中核子结构函数f(x)的结果,以及用偏振光束和靶在DIS中测量的结构函数g1(x)和g2(x)的结果.调整波函数的参数以拟合所有数据。拟合固定了波函数的形状和每个分量的相对强度。找到了两个解,它们都符合f(x)和g1(x),但其中只有一个能很好地描述g2(x)。这种拟合要求核子CST波函数包含较大的D波分量(约35%)和较小的P波分量(约0.6%)。这些结果的意义进行了讨论。

英文摘要:

Using the covariant spectator theory (CST), we present the results of a valence quark-diquark model calculation of the nucleon structure function f(x) measured in unpolarized deep inelastic scattering (DIS), and the structure functions g1(x) and g2(x) measured in DIS using polarized beams and targets. Parameters of the wave functions are adjusted to fit all the data. The fit fixes both the shape of the wave functions and the relative strength of each component. Two solutions are found that fit f(x) and g1(x), but only one of these gives a good description of g2(x). This fit requires the nucleon CST wave functions contain a large D-wave component (about 35%) and a small P-wave component (about 0.6%). The significance of these results is discussed.

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