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arXiv · 2507.17478

Assessing the sensitivity of Energy-Energy Correlations in $e^+e^-$ annihilation to TMD dynamics

Alejandro Bris Cuerpo·Ignazio Scimemi·Alexey Vladimirov
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Abstract

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 (N$^4$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 $\alpha_s$.

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Alejandro Bris Cuerpo, Ignazio Scimemi, Alexey Vladimirov. 2025-07-23. Assessing the sensitivity of Energy-Energy Correlations in $e^+e^-$ annihilation to TMD dynamics. https://arxiv.org/abs/2507.17478

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