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NNLO QCD predictions for Wγ γ Wγγ production at the LHC
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NNLO QCD predictions for Wγ γ Wγγ production at the LHC
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Journal Article
NNLO QCD predictions for Wγ γ Wγγ production at the LHC
2026
Overview
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 ( Wγ γ Wγγ) 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 √s̅=13 s=13 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 23% 23%, with residual perturbative uncertainties that can be roughly estimated to be at the 5% 5% level.
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