arXiv 2602.175332026-02hep-ph

低横动量Drell-Yan产生中的非微扰效应与软胶子动力学

Non-perturbative effects and soft-gluon dynamics in low-$p_T$ Drell-Yan production

University of Montenegro（黑山大学）；University of Antwerp（安特卫普大学）；Universität Hamburg（汉堡大学）；Joint Institute for Nuclear Research（俄罗斯联合核研究所）

D. Subotić, H. Jung, A. V. Kotikov, N. Raičević

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AI总结：

利用PYTHIA中的部分子分支框架研究低横动量Drell-Yan谱，系统处理非微扰效应，发现本征横动量宽度随质心能量的变化趋势，并揭示低横动量区域对微扰与非微扰过渡的敏感性。

摘要：

小横动量Drell-Yan轻子对的横动量谱探测非微扰QCD效应，包括内禀部分子横动量和初态软胶子辐射。新的PYTHIAPB方法在PYTHIA中实现部分子分支框架并使用相同的演化要素，用于研究低横动量区域的谱。该框架特别适合此类研究，因为它允许系统处理主导的非微扰效应及其相互作用。我们详细检查了PYTHIAPB中初始横动量的实现。通过改进的反冲处理，我们确定了内禀横动量分布的宽度，并发现其随质心能量的依赖性比PB更陡，但比PYTHIA平坦得多。我们识别了这些差异的起源。此外，研究了低尺度下强耦合的不同处理，并与现有实验数据进行了比较。我们发现，在所考虑的最高质心能量下，低横动量Drell-Yan谱变得对微扰与非微扰过渡敏感。

英文摘要：

The transverse-momentum spectrum of Drell--Yan lepton pairs at small \ptll\ probes non-perturbative QCD effects, including intrinsic partonic transverse momentum and initial-state soft-gluon radiation. The novel \pythiaPB\ approach, which implements the Parton Branching (\PB ) framework in \pythia\ while employing the same evolution ingredients, is used to study this spectrum in the low-\ptll\ region. This framework is particularly well suited for such investigations, as it allows for a systematic treatment of the dominant non-perturbative effects and their interplay. We examine in detail the implementation of primordial transverse momentum in \pythiaPB . With an improved recoil treatment, we determine the width of the intrinsic-\kt\ distribution and find a \sqrts\ dependence that is steeper than in \PB , but much flatter than in \pythia . We identify the origin of these differences. Furthermore, different treatments of the strong coupling at low scales are investigated and confronted with available experimental data. We find that, at the highest centre-of-mass energy considered, the low-\ptll\ Drell--Yan spectrum becomes sensitive to the transition between the perturbative and non-perturbative regimes.

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