On a possible node in the Sivers and Qiu–Sterman functions
On a possible node in the Sivers and Qiu–Sterman functions
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在 Sivers 和 Qiu-Sterman 函数中的可能节点上
DOI：
10.1016/j.physletb.2011.07.006
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发表时间：
2011
影响因子：
4.4
通讯作者：
D. Boer
中科院分区：
文献类型：
--
作者：
D. Boer
讨论了Sivers和Qiu-Sterman函数的x依赖中存在节点的可能性，因为它对于实验检验半包含DIS和Drell-Yan过程之间Sivers效应的整体符号变化具有重要意义。本文给出了Qiu-Sterman函数与g2的twist-3部分之间Ehrnsperger-Schäfer-Greiner-Mankiewicz关系的x依赖版本，这自然暗示了Qiu-Sterman函数中的一个节点。这种关系也可以通过实验验证，并且可以提供质子内部胶子场强的定性信息。简要讨论了用节点来满足Burkardt和规则，并指出了包括其完整Wilson线在内的Sivers函数建模的重要性。
The possibility of a node in the x dependence of the Sivers and Qiu–Sterman functions is discussed in light of its importance for the experimental check of the overall sign change of the Sivers effect between semi-inclusive DIS and the Drell–Yan process. An x-dependent version of the Ehrnsperger–Schäfer–Greiner–Mankiewicz relation between the Qiu–Sterman function and a twist-3 part of g2is presented, which naturally suggests a node in the Qiu–Sterman function. This relation could be checked experimentally as well and could provide qualitative information on the gluonic field strength inside the proton. Satisfying the Burkardt sum rule by means of a node is briefly discussed and the importance of modelling the Sivers function including its full Wilson line is pointed out.