用于通过事件形状确定强耦合常数的特别工作组
A Task Force on Strong Coupling Determinations from Event Shapes
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中文总结 AI 辅助
本文推动成立特别工作组协调解决不同事件形状确定的强耦合常数αₛ存在的差异问题,报告了2025年11月在CERN的首次会议情况并明确了相关任务。
中文摘要 AI 辅助
强耦合常数αₛ是标准模型的基本参数,其精确测定对准确预测、研究和理解大型强子对撞机及未来实验(如未来环形对撞机)的过程至关重要。正负电子对撞机上测量的事件形状和关联函数可观测量,因对αₛ敏感且拥有大型正负电子对撞机的高精度数据,成为提取αₛ最干净的环境之一。更广泛而言,这类可观测量为发展和检验对量子色动力学微扰与非微扰要素的理解提供了理想场景,这将支撑该领域未来数十年的精度和发现前沿。尽管取得了这些进展,不同事件形状确定的αₛ在提取的中心值和估计的不确定性方面仍存在显著差异。本文档推动成立专门的特别工作组,协调全社区努力解决这些未决问题。我们报告了2025年11月在欧洲核子研究中心举办的首次为期两天的会议,总结了科学讨论,记录了会议确定为优先事项的实验分析,以及理论界为筹备未来会议需开展的具体任务清单。
英文摘要
The strong coupling constant $α_s$ is a fundamental parameter of the Standard Model. Its precise determination is essential for accurately predicting, studying, and understanding processes at the Large Hadron Collider and future experiments such as the Future Circular Collider. Event shape and correlator observables measured at electron-positron colliders provide one of the cleanest environments for extracting $α_s$, thanks to their sensitivity to $α_s$ and the availability of high-precision data from the Large Electron-Positron Collider. More broadly, such observables provide an ideal setting to develop and test our understanding of the perturbative and non-perturbative elements of Quantum Chromodynamics, which will underpin the field's precision and discovery frontiers for decades to come. Despite these advances, significant discrepancies persist between different determinations of $α_s$ from event shapes, both in the extracted central values and estimated uncertainties. This document motivates the establishment of a dedicated Task Force to coordinate a community-wide effort addressing these open questions. We report on the first two-day meeting held at CERN in November 2025, summarizing the scientific discussion and documenting the experimental analyses identified as priorities during the meeting, as well as the concrete list of tasks to be carried out by the theory community in preparation for future meetings.
发表机构
- University of Chicago(芝加哥大学)
- CERN(欧洲核子研究中心)
- Università degli Studi di Milano-Bicocca(米兰比可卡大学)
- INFN, Sezione di Milano-Bicocca(意大利国家核物理研究所米兰比可卡分部)
- University of Bern(伯尔尼大学)
- Vanderbilt University(范德堡大学)
- Physik-Institut, Universität Zürich(苏黎世大学物理研究所)
- University of Vienna(维也纳大学)
- Max Planck Institute for Physics(马克斯·普朗克物理研究所)
- MIT(麻省理工学院)
- Laboratory for Nuclear Science(核科学实验室)
- Fundamental Physics Department and IUFFyM, University of Salamanca(萨拉曼卡大学基础物理系及IUFFyM)
- Università degli Studi di Milano(米兰大学)
- INFN, Sezione di Milano(意大利国家核物理研究所米兰分部)
- MIT Center for Theoretical Physics – A Leinweber Institute(麻省理工学院理论物理中心——莱因韦伯研究所)
- Università degli Studi di Torino(都灵大学)
- INFN, Sezione di Torino(意大利国家核物理研究所都灵分部)
- Technische Universität München(慕尼黑工业大学)
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