AI 中文总结
该研究利用 CMS 实验 13 TeV 质子-质子碰撞数据，测量 Z+jet 三重微分截面，以探究质子部分子结构并确定强耦合常数。
AI 中文摘要
本文呈现了利用 CERN LHC 上 CMS 实验在质心能量为 13 TeV 时记录的质子-质子碰撞数据，对 Z/$\gamma^*$($\to$ $\mu\mu$)+jet 事件的三重微分产生截面的测量。数据采集于 2016$-$2018 年，对应积分亮度为 138 fb$^{-1}$。截面作为 μ 子对横向动量、μ 子对质心系相对于实验室系的快度提升以及领先喷注的快度提升、以及它们绝对快度差的一半的函数进行测量。这一可观测量选择确保了对于质心系散射角和相互作用部分子分数动量的灵敏度。在三个维度上同时进行探测器效应去折叠后，结果与微扰量子色动力学中次次领头阶并修正了电弱和非微扰效应的预言进行了比较。该测量为表征质子的部分子结构和确定强耦合常数提供了有价值的信息。
英文摘要
A measurement is presented of the triple-differential production cross section of Z/$γ^*$($\to$ $μμ$)+jet events using proton-proton collision data recorded at a center-of-mass energy of 13 TeV by the CMS experiment at the CERN LHC. The data, collected in the years 2016$-$2018, correspond to an integrated luminosity of 138 fb$^{-1}$. The cross section is measured as a function of the transverse momentum of the muon pair, the boost in rapidity of the center-of-mass system of the muon pair and the leading jet with respect to the laboratory frame, and half of their absolute rapidity separation. This choice of observables ensures sensitivity to the scattering angle in the center-of-mass frame and the fractional momenta of the interacting partons. After unfolding for detector effects in all three dimensions simultaneously, the results are compared with predictions at next-to-next-to-leading order in perturbative quantum chromodynamics corrected for electroweak and nonperturbative effects. This measurement provides valuable information towards characterizing the partonic structure of the proton and determining the strong coupling.
CommentsSubmitted to the Journal of High Energy Physics. All figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/SMP-24-010 (CMS Public Pages)
