March 3, 2026Open Access

Low-energy e + e − → γ γ at NNLO in QED

Key Points

The calculation improves precision for electron-positron collision processes, which is crucial for accurate physical predictions.
Next-to-next-to-leading order results enhance luminosity measurement capabilities at colliders with energies up to a few GeV.
Differential computations enable wider applications in particle physics, particularly at electron-positron colliders.
Implemented in McMule, this work completes the NNLO efforts for essential 2 → 2 scattering processes.

Abstract

We present a fully differential computation of e + e − → γ γ at next-to-next-to-leading order in QED. The process has been implemented into McMule , completing its set of next-to-next-to-leading-order calculations for the most important 2 → 2 processes. The results allow for generic applications to electron-positron colliders with centre-of-mass energies up to a few GeV, particularly for luminosity measurements.

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Cite This Study

Engel et al. (Mon,) studied this question.

synapsesocial.com/papers/69a765b6badf0bb9e87da20a https://doi.org/https://doi.org/10.1016/j.physletb.2026.140236

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