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arXiv · 2610.09680

NNLO initial-state corrections to $e^+\,e^-\toμ^+\,μ^-\,γ$

Yizhou Fang·Sara Gündogdu·Sophie Kollatzsch·Marco Rocco·Adrian Signer·Yannick Ulrich
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Abstract

We present initial-state corrections to $e^+\,e^-\toμ^+\,μ^-\,γ$ at next-to-next-to-leading-order in QED for several experimentally motivated scenarios up to a few GeV. We include photonic as well as vacuum-polarisation corrections into the Monte Carlo framework McMule that allows for the calculation of arbitrary infrared-safe observables. For the total cross sections, the corrections are typically below the percent level, but they can be locally larger in distributions. The vacuum-polarisation corrections are of similar size and must not be neglected, in particular for larger centre-of-mass energies.

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Yizhou Fang, Sara Gündogdu, Sophie Kollatzsch, Marco Rocco, Adrian Signer, Yannick Ulrich. 2026-10-07. NNLO initial-state corrections to $e^+\,e^-\toμ^+\,μ^-\,γ$. https://arxiv.org/abs/2610.09680

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