Low-energy e⁺ e^-→γ γ at NNLO in QED

2025/12/28 by Engel, Tim, Rocco, Marco, Signer, Adrian +1
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.2512.22929

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.

Citations

• Two-loop helicity amplitudes for diphoton production with massive quark loop
• FLAG Review 2024
• Radiative corrections and Monte Carlo tools for low-energy hadronic cross sections in e⁺ e^- collisions
• Full NNLO QCD corrections to diphoton production
• Two-loop form factors for diphoton production in quark annihilation channel with heavy quark mass dependence
• Full top-quark mass dependence in diphoton production at NNLO in QCD
• Impact of NNLO QED corrections on lepton-proton scattering at MUSE
• NNLO Photon Production with Realistic Photon Isolation
• McMule -- QED Corrections for Low-Energy Experiments

Related

• McMule -- QED Corrections for Low-Energy Experiments
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• Higher-order NLO initial state QED radiative corrections to e⁺e^- annihilation revisited
• Towards a full NNLO Monte Carlo generator for low energy e⁺e^- data into leptons and hadrons
• Initial state QED radiation aspects for future e⁺e^- colliders