标题： 一个用于研究Drell-Yan过程部分子内在横向动量的$p_T$-比值可观测量$p_T$谱 显示英文标题

标题： A $p_T$-ratio observable for studies of intrinsic transverse momentum of partons from Drell-Yan $p_T$ spectra

摘要： 部分子内在横向动量分布的确定对于部分子 showers 蒙特卡洛生成器的应用以及横向动量依赖(TMD)部分子密度的QCD研究都具有核心意义。 在低横向动量区域，通过对Drell-Yan横向动量 $p_T$ 的实验测量，尤其是在 $p_T$ 的细划分中，提供了关于此分布的有价值信息。 然而，这种细划分测量极具挑战性，因为它需要对系统误差进行极其精细的控制。 我们提出了一种基于测量适当定义的低 $p_T$ 和高 $p_T$ 区域截面比值的 $p_T$ 观测量。 这一观测量无需任何专门的分区，并且具有较低的系统不确定性，显示出对内在横向动量的良好敏感性。 显示英文摘要

摘要： The determination of the intrinsic transverse momentum distribution of partons is central both for applications of parton shower Monte Carlo generators and for QCD studies of transverse momentum dependent (TMD) parton densities. Valuable information on this distribution is provided by experimental measurements of Drell-Yan transverse momentum $p_T$, in the region of low transverse momenta, with fine binning in $p_T$. However, such fine-binning measurements are challenging, as they require an extremely delicate control of systematic uncertainties. We suggest a $p_T$ observable based on measuring ratios between cross sections of suitably defined low-$p_T$ and high-$p_T$ regions. This observable does not rely on any dedicated partition of bins and has lower systematic uncertainties, and is shown to provide a good sensitivity to the intrinsic transverse momentum.