https://doi.org/10.1140/epjc/s10052-026-15316-9
Letter
NNLO QCD predictions for 
production at the LHC
1
Physik Institut, Universität Zürich, Winterthurerstrasse 190, 8057, Zurich, Switzerland
2
Physics Department, TUM School of Natural Sciences, Technical University of Munich, James-Franck-Straße 1, 85748, Garching, Germany
a
This email address is being protected from spambots. You need JavaScript enabled to view it.
Received:
8
December
2025
Accepted:
11
January
2026
Published online:
5
February
2026
Abstract
Triboson production processes play a crucial role in probing the electroweak sector of the Standard Model, as they involve quartic gauge-boson couplings already at the tree level. With these measurements entering the precision era at the Large Hadron Collider (LHC), accurate theoretical predictions become indispensable. We present the computation of the next-to-next-to-leading-order (NNLO) QCD radiative corrections to the production of a W boson in association with two photons () at the LHC. The calculation is exact, except for the finite part of the two-loop contribution, which is included in the leading-colour approximation. Predictions for the fiducial cross section and selected kinematic distributions are provided at a centre-of-mass energy of 
TeV, under standard experimental selection cuts. In line with observations for other multiboson processes involving direct photons, we find sizable NNLO corrections that enhance the next-to-leading-order predictions by about 
, with residual perturbative uncertainties that can be roughly estimated to be at the 
level.
© The Author(s) 2026
Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
Funded by SCOAP3.
