软QCD效应对喷注内方位角各向异性的影响
Impact of soft QCD effects over intrajet azimuthal anisotropies
- Departamento de Investigación en Física, Universidad de Sonora（索诺拉大学物理研究系）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本文通过比较PYTHIA软QCD模型预测与LHC数据，研究喷注内方位角各向异性，发现WTA与ES框架差异显著，最高多重数下$v_2$预测与数据在2.3$\sigma$内一致，为探索喷注内集体效应提供新指导。
AI中文摘要：
最近，在欧洲核子研究中心（CERN）实验室的大型强子对撞机（LHC）上的测量报告了喷注内粒子集体特征的观测结果，为形成夸克-胶子等离子体（QGP）状态所需的最小条件提供了见解。本文呈现了喷注内方位角各向异性数据测量与PYTHIA事件生成器软QCD模型参数调优（Monash、CP5和QCD-scheme CR）预测之间的定量比较。重建了13 TeV质子-质子碰撞中横向动量超过550 GeV的高能喷注。使用标准E-scheme（ES）和喷注轴选择得到的预测结果与Winner-Take-All（WTA）框架的结果进行了比较。在最低和最高的喷注内带电粒子多重数（$N_{\mathrm{ch}}$）下，WTA和ES框架的预测之间存在显著差异，其中QCD-scheme CR调优在框架间显示出最小的变化。在最高$N_{\mathrm{ch}}$下，$v_2$的预测与数据测量在2.3$\sigma$不确定性水平内一致。这些结果为寻找喷注内集体效应和理解源自单个部分子的非微扰QCD动力学提供了新的指导。
英文摘要：
Observations of collective signatures within jets of particles have been recently reported by measurements at the Large Hadron Collider at CERN laboratory, providing insights on the minimum conditions required for forming a Quark Gluon Plasma state. A quantitative comparison with data measurements on intrajet azimuthal anisotropies and predictions from PYTHIA event generator soft QCD model parameter tunes: Monash, CP5, and QCD-scheme CR is presented. Energetic jets with transverse momentum over 550 GeV from proton-proton collisions at 13 TeV are reconstructed. Results from predictions using the standard E-scheme (ES) and jet axis choice are compared with those from the Winner-Take-All (WTA) frame. Significant differences are present between predictions from WTA and ES frames at the lowest and highest intrajet charged particles multiplicities ($N_{\mathrm{ch}}$), with the QCD-scheme CR tune showing the smallest variation between frames. Predictions for $v_2$ at the highest $N_{\mathrm{ch}}$ are consistent with the data measurements at a 2.3$σ$ uncertainty level. These results set new guidance towards the search for intrajet collective effects and understanding of nonperturbative QCD dynamics originated from a single parton.
