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<p>We critically examine the back-to-back limit of the energy-energy correlation (EEC) in <i>e</i><sup>+</sup><i>e</i><sup>−</sup> annihilation as a potential source of information on the Collins-Soper kernel and the strong coupling constant. The analysis is performed within the framework of transverse momentum dependent (TMD) factorization at next-to-next-to-next-to-next-to-leading logarithmic (N<sup>4</sup>LL) accuracy, using a global fit to all available experimental data. Contrary to previous claims, we demonstrate that the current data do not provide meaningful constraints on either the Collins-Soper kernel or <i>α</i><sub><i>s</i></sub>.</p>

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Assessing the sensitivity of energy-energy correlations in e+e− annihilation to TMD dynamics

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月4日

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  • Alejandro Bris Cuerpo,
  • Ignazio Scimemi,
  • Alexey Vladimirov

摘要

We critically examine the back-to-back limit of the energy-energy correlation (EEC) in e+e− annihilation as a potential source of information on the Collins-Soper kernel and the strong coupling constant. The analysis is performed within the framework of transverse momentum dependent (TMD) factorization at next-to-next-to-next-to-next-to-leading logarithmic (N4LL) accuracy, using a global fit to all available experimental data. Contrary to previous claims, we demonstrate that the current data do not provide meaningful constraints on either the Collins-Soper kernel or αs.