发表机构
CERN; University of California, Los Angeles; Mani L. Bhaumik Institute for Theoretical Physics, University of California, Los Angeles; Center for Frontiers in Nuclear Science, Stony Brook University; Massachusetts Institute of Technology; Institute of Modern Physics, Chinese Academy of Sciences; University of Chinese Academy of Sciences（欧洲核子研究中心; 加州大学洛杉矶分校; 加州大学洛杉矶分校马尼·L·巴乌米克理论物理研究所; 纽约州立大学石溪分校核科学前沿中心; 麻省理工学院; 中国科学院近代物理研究所; 中国科学院大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究结合因子化方法与EEC喷注函数，预言了不同能量下向前Z+喷注产生的EEC分布，揭示了禁闭相变的味依赖特性，为检验禁闭尺度的普适性提供了探针。
AI 中文摘要
我们给出了禁闭相变区域内质子-质子碰撞中Z标记喷注内部测量的共线能量-能量关联子（EEC）的预言。本框架结合了背靠背Z+喷注产生的横动量依赖因子化，以及包含微扰演化和味依赖非微扰碎裂的排他微分EEC喷注函数。该EEC喷注函数在NLL'精度下进行评估，其中夸克和胶子的非微扰尺度由已有的正负电子对撞（e⁺e⁻）和 inclusive喷注数据约束。我们给出了质心系能量√s=8 TeV和13 TeV下向前Z+喷注产生的预言，对应的喷注横动量区间为(20,30)、(30,50)和(50,100) GeV。作为z_χ函数的EEC分布在小z_χ处呈现有限平台，而对应的角分布显示出与禁闭相变相关的特征拐点。味分解表明，随着喷注横动量增加，该相变越来越由夸克引发的喷注主导。因此，向前Z标记喷注为非微扰夸克碎裂提供了干净的探针，并为检验从正负电子对撞中提取的特征禁闭尺度在强子环境中是否仍具有普适性提供了直接测试手段。
英文摘要
We present predictions for the collinear energy-energy correlator (EEC) measured inside $Z$-tagged jets in proton-proton collisions across the confinement transition. Our framework combines transverse-momentum-dependent factorization for back-to-back $Z+$jet production with an exclusive differential EEC jet function incorporating perturbative evolution and flavor-dependent non-perturbative fragmentation. The EEC jet function is evaluated at $\mathrm{NLL}^{\prime}$ accuracy, with separate quark and gluon non-perturbative scales constrained by existing $e^+e^-$ and inclusive-jet data. We provide predictions for forward $Z+$jet production at $\sqrt{s}=8~\mathrm{TeV}$ and $13~\mathrm{TeV}$ in the jet transverse-momentum intervals $(20, 30)$, $(30, 50)$ and $(50, 100) \, \mathrm{GeV}$. The EEC distributions as functions of $z_χ$ exhibit finite plateaus at small $z_χ$, while the corresponding angular distributions display the characteristic turnover associated with the confinement transition. A flavor decomposition shows that this transition becomes increasingly dominated by quark-initiated jets as the jet transverse momentum increases. Forward $Z$-tagged jets therefore provide a clean probe of non-perturbative quark fragmentation and offer a direct test of whether the characteristic confinement scale extracted from $e^+e^-$ collisions remains universal in a hadronic environment.
Comments10 pages, 5 figures
