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arXiv 1107.5755hep-phhep-exnucl-th
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通过半包含测量约束夸克angular momentum

Constraining quark angular momentum through semi-inclusive measurements

Alessandro Bacchetta, Marco Radici

摘要:

夸克角动量的确定需要知道前向极限下的广义部分子分布E。我们假设这个函数和西弗斯横向动量分布之间的连接,基于模型计算和理论考虑。利用这一假设,我们证明了同时拟合核子磁矩和半包容单自旋不对称性是可能的。这对Sivers函数施加了额外的约束,并为量化夸克角动量开辟了一条可行的途径。

英文摘要:

The determination of quark angular momentum requires the knowledge of the generalized parton distribution E in the forward limit. We assume a connection between this function and the Sivers transverse-momentum distribution, based on model calculations and theoretical considerations. Using this assumption, we show that it is possible to fit at the same time nucleon magnetic moments and semi-inclusive single-spin asymmetries. This imposes additional constraints on the Sivers function and opens a plausible way to quantifying quark angular momentum.

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