论文标题
横向极化质子的半包含深度无弹性Lepton散射中方位角单旋和双旋不对称
Azimuthal single- and double-spin asymmetries in semi-inclusive deep-inelastic lepton scattering by transversely polarized protons
论文作者
论文摘要
呈现了一组全面的方位角单旋和双旋不对称，呈现了来自横向极化质子的乳酸，带电的kaons，质子和抗抑制剂的半包裹。这些不对称包括先前发表的HERMES结果，这些结果在柯林斯和西里米不对称方面，其分析已扩展为包括质子和抗抗原子，以及在三维运动学构造和扩大相位空间中提取的。它们通过相应的结果来补充，其余的四个单旋和四旋旋转不对称允许在半含量的深度弹性散射过程的单相位交换近似中，以垂直于垂直于输入lepton束的方向。在这些结果中，重要的非散布$ \ cos {ϕ-ϕ_s} $调制为相当大的蠕虫分布（II）分布提供了证据，$ g_ {1t} $。发现大多数其他调制量与零一致，显着的$ \ sin {ϕ_s} $调制了带电亲和正kaons的调制。
A comprehensive set of azimuthal single-spin and double-spin asymmetries in semi-inclusive leptoproduction of pions, charged kaons, protons, and antiprotons from transversely polarized protons is presented. These asymmetries include the previously published HERMES results on Collins and Sivers asymmetries, the analysis of which has been extended to include protons and antiprotons and also to an extraction in a three-dimensional kinematic binning and enlarged phase space. They are complemented by corresponding results for the remaining four single-spin and four double-spin asymmetries allowed in the one-photon-exchange approximation of the semi-inclusive deep-inelastic scattering process for target-polarization orientation perpendicular to the direction of the incoming lepton beam. Among those results, significant non-vanishing $\cos{ϕ-ϕ_S}$ modulations provide evidence for a sizable worm-gear (II) distribution, $g_{1T}$. Most of the other modulations are found to be consistent with zero with the notable exception of large $\sin{ϕ_S}$ modulations for charged pions and positive kaons.
