Transverse-momentum dependent parton distribution functions (TMDs) provide a description of nucleon structure in terms of the parton transverse momentum and its transverse spin. At leading twist there are eight TMDs, each offering a unique feature of quarks in a polarized or an unpolarized nucleon. The Sivers distribution is one of the most interesting TMD due to its non-universality. It has been extracted using the data from semi-inclusive deep-inelastic scattering (SIDIS), but there is no data yet from spin-dependent Drell-Yan (DY) process. Such measurement will provide a crucial test of TMD formalism which predicts an equal magnitude and opposite sign for the Sivers function extracted from SIDIS and DY process. We will discuss key future measurements of TMDs using both SIDIS and DY process with a focus on Hall A SoLID SIDIS program at Jefferson Lab.
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机译：横向动量依赖的parton分布函数（TMD）提供了关于parton横向动量及其横向自旋的核子结构描述。领先时有八个TMD，每个TMD都具有极化或非极化核子中夸克的独特特征。由于Sivers分布不通用，因此是最有趣的TMD之一。它是使用半包容性深层非弹性散射（SIDIS）的数据提取的，但尚无自旋相关的Drell-Yan（DY）过程的数据。这种测量将提供TMD形式主义的关键测试，该测试为从SIDIS和DY过程中提取的Sivers函数预测相同的幅度和相反的符号。我们将讨论未来使用SIDIS和DY工艺对TMD进行的关键测量，重点是杰斐逊实验室的A Hall SoLID SIDIS程序。
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