We investigate inclusive $J/ψ$ production in proton-proton collisions at tens of GeV $\sqrt{s}$ energy, relevant for forthcoming measurements with the Spin Physics Detector (SPD) at NICA. Simulations are performed using the PEGASUS event generator with transverse-momentum-dependent (TMD) gluon densities, comparing the recent KMR-based KL$'2025$ and CCFM-based LLM$'2024$ parametrizations. Differential cross sections in rapidity and transverse momentum exhibit smooth, stable behavior under renormalization-scale variation. Normalized $p_T$ spectra reveal distinct hardening patterns linked to the underlying gluon $k_T$ broadening in each model. The relative contributions of color-singlet and color-octet channels are also quantified, demonstrating the dominance of color-octet mechanisms in the SPD energy regime. These results provide the first detailed assessment of quarkonium production sensitivity to gluon TMDs near threshold, offering timely theoretical guidance for upcoming $J/ψ$ measurements at SPD/NICA.
Event simulation based on three-fluid hydrodynamics for collisions at energies available at the Dubna Nuclotron-based Ion Collider Facility and at the Facility for Antiproton and Ion Research in Darmstadt
On the physics potential to study the gluon content of proton and deuteron at NICA SPD
自旋物理探测器（SPD）是一个未来的多用途实验，预计将在NICA对撞机上运行，目前正在联合核研究所（JINR，杜布纳，俄罗斯）建造。该实验的物理方案是基于纵向和横向极化质子和氘核的碰撞，其能量为$\sqrt{s}$至27 GeV，亮度为10 $^{32}$ cm $^{-2}$ s $^{-1}$。SPD将作为一个通用的设施，使用不同的互补探针，如：charmonia，开放的魅力，并提示光子生产过程的核子的非极化和极化胶子内容的综合研究。这项工作的目的是对SPD可能解决的物理目标进行彻底的审查，强调相关的理论方面，并在可用时讨论相关的实验结果。在不同的相关现象中，特别注意的是通过测量特定的单自旋和双自旋不对称性来研究核子中的胶子螺旋度、胶子Sivers和Boer-Mulders函数，以及氘核中的胶子横变性分布。
Tensor-polarized twist-3 parton distribution functions $f_{LT}(x)$ for the spin-1 deuteron by using twist-2 relations
Quark Matter Research Center, Institute of Modern Physics, Chinese Academy of Sciences（中国科学院近代物理研究所夸克物质研究中心）；Southern Center for Nuclear Science Theory, Institute of Modern Physics, Chinese Academy of Sciences（中国科学院近代物理研究所南方核科学理论中心）；KEK Theory Center, Institute of Particle and Nuclear Studies, KEK（高能加速器研究机构粒子与核研究部KEK理论中心）
Probing the Moderate-to-Large-$x$ Gluon Helicity with $J/ψ$ Production at $\sqrt{s}=\mathrm{GeV}$
Moscow Institute of Physics and Technology（莫斯科物理技术学院）；Joint Institute for Nuclear Research（苏联联合核研究所）；Institute for Nuclear Physics, Almaty（阿拉木图核物理研究所）；Institute of Physics, Academia Sinica（中央研究院物理学研究所）；Computational Theoretical High Energy Physics Lab, Department of Physics, Doaba College（多巴学院物理系计算理论高能物理实验室）；Computational High Energy Physics Lab, Department of Physics, Dr. B.R. Ambedkar National Institute of Technology（B.R.安贝德卡尔国立理工学院物理系计算高能物理实验室）
