Nuclear dependence of azimuthal asymmetry in semi-inclusive deep inelastic scattering
Nuclear dependence of azimuthal asymmetry in semi-inclusive deep inelastic scattering
复制标题
半包容深度非弹性散射中方位角不对称性的核依赖性
DOI：
10.1103/physrevc.81.065211
复制
发表时间：
2010-01
期刊：
影响因子：
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通讯作者：
Xin-Nian Wang
中科院分区：
文献类型：
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作者：
Jian-Hua Gao;Zuo-tang Liang;Xin-Nian Wang
在广义因式分解的框架内，半包容深度非弹性散射（SIDIS）截面可以表示为一系列共线硬部分和横向动量相关（TMD）部分子分布和相关性的乘积。在小横动量区，非极化SIDIS的方位角不对称性ε cos φ ε依赖于靶核子或核中的twist-2和-3 TMD夸克分布。研究了这些扭曲2和扭曲3夸克分布由于核中末态多重散射引起的核加宽，并研究了角向不对称性的核依赖性.结果表明，方位角非对称性被多重部分子散射抑制，这种抑制的横动量依赖性依赖于核子中扭曲2和扭曲3夸克分布的相对形状。本文利用核子中TMD扭数-2和-3夸克分布的高斯近似，证明了方位角不对称性的核依赖性，并估计了碎裂引起的拖尾效应。
Within the framework of a generalized factorization, semi-inclusive deeply inelastic scattering (SIDIS) cross sections can be expressed as a series of products of collinear hard parts and transverse-momentum-dependent (TMD) parton distributions and correlations. The azimuthal asymmetry 〈cos φ〉 of unpolarized SIDIS in the small transverse-momentum region will depend on both twist-2 and -3 TMD quark distributions in target nucleons or nuclei. Nuclear broadening of these twist-2 and -3 quark distributions due to final-state multiple scattering in nuclei is investigated and the nuclear dependence of the azimuthal asymmetry 〈cos φ〉 is studied. It is shown that the azimuthal asymmetry is suppressed by multiple parton scattering and the transverse-momentum dependence of the suppression depends on the relative shape of the twist-2 and -3 quark distributions in the nucleon. A Gaussian ansatz for TMD twist-2 and -3 quark distributions in nucleon is used to demonstrate the nuclear dependence of the azimuthal asymmetry and to estimate the smearing effect due to fragmentation.
DOI：
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发表时间：
2002
期刊：
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影响因子：
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作者：
通讯作者：
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