发表机构
Centre for Theoretical and Computational Physics, College of Physics, Qingdao University; School of Physics, Southeast University（青岛大学物理学院理论计算物理中心; 东南大学物理学院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文在共线框架下研究SIDIS中横向极化Λ产生的横向自旋不对称性，通过双夸克模型计算twist-3碎裂函数并预测EIC和EicC下的不对称性，发现奇异夸克贡献显著。
AI 中文摘要
我们研究了在非极化电子束和非极化核子靶的半单举深度非弹性散射中，横向极化的$\Lambda$产生的横向自旋不对称性 $A^{\sin\phi_{S_\Lambda}}_{UUT}$。该自旋相关的不对称性对twist-3 T-odd夸克-胶子-夸克碎裂函数 $\tilde{D}_{T}$ 敏感，该函数描述了非极化碎裂夸克与所产生的强子横向极化之间的关联。我们在双夸克模型内计算了$\Lambda$超子的 $\tilde{D}_{T}$，并研究了其对不对称性的贡献。我们通过将碎裂函数 $D_1$ 和 $G_1$ 拟合到DSV参数化来确定模型参数。利用模型的数值结果和可用的非极化部分子分布函数 $f_1$ 的参数化，我们预测了在EIC和EicC运动学区域中$\Lambda$超子电产生过程中的不对称性。我们还考察了包含奇异夸克贡献对横向自旋不对称性的影响。在我们的唯象分析中，我们包含了部分子分布函数 $f_1$ 和碎裂函数 $\tilde{D}_{T}$ 的QCD演化。结果表明，该不对称性是显著的，并且可以被奇异夸克贡献显著修改。
英文摘要
We investigate the transverse-spin asymmetry $A^{\sinϕ_{S_Λ}}_{UUT}$ for transversely polarized $Λ$ production in semi-inclusive deep inelastic scattering with an unpolarized electron beam and an unpolarized nucleon target. The spin-dependent asymmetry is sensitive to the twist-3 T-odd quark-gluon-quark fragmentation function $\tilde{D}_{T}$, which describes the correlation between an unpolarized fragmenting quark and the transverse polarization of the produced hadron. We calculate $\tilde{D}_{T}$ of the $Λ$ hyperon within a diquark model and investigate its contribution to the asymmetry. We determine the model parameters by fitting the fragmentation functions $D_1$ and $G_1$ to the DSV parametrization. Using the numerical results of the model and the available parametrization of the unpolarized parton distribution function $f_1$, we predict the asymmetry in the electroproduction of the $Λ$ hyperon in the kinematic regions of the EIC and the EicC. We also examine the impact of including the strange-quark contribution on the transverse-spin asymmetry. In our phenomenological analysis, we include the QCD evolution of the parton distribution function $f_1$ and the fragmentation function $\tilde{D}_{T}$. The results show that the asymmetry is sizable and can be significantly modified by the strange-quark contribution.
Comments11 pages, 7 figures
