A Task Force on Strong Coupling Determinations from Event Shapes
Abstract
The strong coupling constant αs 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 αs, thanks to their sensitivity to αs 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 αs 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.
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BibTeX
@misc{badea2026task,
title = {{A Task Force on Strong Coupling Determinations from Event Shapes}},
author = {Anthony Badea and Luca Buonocore and Gherardo Vita and Simone Alioli and Zeno Capatti and Yi Chen and David d'Enterria and Thomas Gehrmann and Andre H. Hoang and Alexander Huss and Sebastian Jaskiewicz and Alexander Karlberg and Yen-Jie Lee and Michelangelo L. Mangano and Vicent Mateu and Jiahao Miao and Pier Francesco Monni and Paolo Nason and Luca Rottoli and Iain W. Stewart and Paolo Torrielli and Giulia Zanderighi},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.03002},
eprint = {2609.03002},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.03002},
}
RIS
TY - UNPB
TI - A Task Force on Strong Coupling Determinations from Event Shapes
AU - Anthony Badea
AU - Luca Buonocore
AU - Gherardo Vita
AU - Simone Alioli
AU - Zeno Capatti
AU - Yi Chen
AU - David d'Enterria
AU - Thomas Gehrmann
AU - Andre H. Hoang
AU - Alexander Huss
AU - Sebastian Jaskiewicz
AU - Alexander Karlberg
AU - Yen-Jie Lee
AU - Michelangelo L. Mangano
AU - Vicent Mateu
AU - Jiahao Miao
AU - Pier Francesco Monni
AU - Paolo Nason
AU - Luca Rottoli
AU - Iain W. Stewart
AU - Paolo Torrielli
AU - Giulia Zanderighi
PY - 2026
DA - 2026/09/02
PB - arXiv
DO - 10.48550/arxiv.2609.03002
UR - https://arxiv.org/abs/2609.03002
AB - 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.
ER -