ePIC早期科学报告
ePIC Early Science Report
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中文总结 AI 辅助
该报告概述了ePIC合作组在EIC全设计性能达成前的初期运行计划,将开展多类物理测量以探索量子色动力学,为EIC完整物理计划奠定方法基础。
中文摘要 AI 辅助
本ePIC合作组发布的早期科学报告,概述了电子离子对撞机(EIC)在全设计亮度与能量范围建立前的运行初期可开展的引人注目的物理研究计划。相关分析基于现实的初期运行束流配置、详细的Geant4 ePIC探测器模拟、击中数字化及数据重建结果。ePIC物理工作组规划的研究涵盖电子-质子与电子-离子碰撞中的遍举、半遍举、单举、衍射与标记,以及喷注和重味测量。即便在对撞机达到全设计性能前,这些测量也将约束核子与原子核的部分子分布函数,获取横向动量依赖及自旋依赖可观测量,探究原子核内的胶子动力学,并启动夸克与胶子成像计划。每项测量均与美国国家科学院2018年报告确定的EIC核心科学支柱直接相关:理解核子质量的起源、揭示核子的自旋结构、探究致密胶子物质的涌现性质。本文呈现的结果证明,EIC在ePIC运行的初期将提供关于量子色动力学的新颖世界领先见解。此外,早期科学计划将建立测量与分析方法,为后续的完整EIC物理计划奠定基础。
英文摘要
This Early Science Report from the ePIC Collaboration outlines the compelling physics program achievable during the first years of operation of the Electron-Ion Collider (EIC), prior to the establishment of the full design luminosity and energy range. The analyses are based on realistic early-running beam configurations and detailed Geant4 ePIC detector simulations, hit digitization and data reconstruction. The projected studies from the physics working groups of ePIC span inclusive, semi-inclusive, exclusive, diffractive and tagging, as well as jet and heavy flavor measurements in both electron-proton and electron-ion collisions. Even before the collider reaches its full design performance, these measurements will constrain parton distribution functions in nucleons and nuclei, access transverse-momentum-dependent and spin-dependent observables, probe gluon dynamics in nuclei, and initiate a program of imaging of quarks and gluons. Each measurement is directly connected to the core science pillars of the EIC, identified in the 2018 report by the National Academy of Sciences: understanding the origin of the nucleon mass, unraveling the spin structure of the nucleon, and exploring the emergent properties of dense gluonic matter. The results presented here provide examples that demonstrate that the early years of EIC running with ePIC will deliver novel world-leading insights into Quantum Chromodynamics. In addition, the early science program will establish measurement and analysis methodologies that will pave the way to the subsequent full EIC physics program.