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arXiv · 2504.19681

The asymmetry $A_{LL}^{\cos2\phi}$ in the polarized proton-proton Drell-Yan process within TMD factorization

Hui Li·Ting Hu·Liang-Liang Liu·Xiao-Yu Wang·Zhun Lu
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Abstract

We study the $\cos2\phi$ azimuthal asymmetry in doubly longitudinally polarized proton-proton Drell-Yan collisions within the transverse momentum dependent factorization framework. The asymmetry arises from the convolution of the longitudinal transversity distribution $h_{1L}^{\perp}$ for both protons. Using the Bacchetta-Delcarro-Pisano-Radici-Signori parametrization for the nonperturbative Sudakov form factor and the Wandzura-Wilczek approximation for the collinear $h_{1L}^{\perp}$, we predict the double spin asymmetry $A_{LL}^{\cos2\phi}$ at RHIC and NICA kinematics. Our results demonstrate sensitivity to sea quark distributions, with the asymmetry reaching up to $25\%$ for maximal sea quark contributions. These predictions highlight the potential of polarized Drell-Yan measurements to probe sea quark dynamics and advance our understanding of nucleon structure.

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Hui Li, Ting Hu, Liang-Liang Liu, Xiao-Yu Wang, Zhun Lu. 2025-04-28. The asymmetry $A_{LL}^{\cos2\phi}$ in the polarized proton-proton Drell-Yan process within TMD factorization. https://arxiv.org/abs/2504.19681

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