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arXiv 1111.6069hep-phhep-exnucl-exnucl-th
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Pretzelosity TMD与夸克轨道Angular Momentum

Pretzelosity TMD and Quark Orbital Angular Momentum

C. Lorce', B. Pasquini

摘要:

研究了夸克轨道角动量与Pretzelosity横动量相关的部分子分布函数之间的联系。我们在夸克模型中讨论了这种关系的起源,指出核子在静止坐标系中的球对称性假设是其有效性的关键因素。最后指出,由这个关系式得到的各个夸克对轨道角动量的贡献不能解释为内禀贡献,而是包括了横动量中心的贡献,它只在总的轨道角动量中抵消。

英文摘要:

We study the connection between the quark orbital angular momentum and the pretzelosity transverse-momentum dependent parton distribution function. We discuss the origin of this relation in quark models, identifying as key ingredient for its validity the assumption of spherical symmetry for the nucleon in its rest frame. Finally we show that the individual quark contributions to the orbital angular momentum obtained from this relation can not be interpreted as the intrinsic contributions, but include the contribution from the transverse centre of momentum which cancels out only in the total orbital angular momentum.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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