Speaker
Description
Triboson production processes play a crucial role in probing the electroweak sector of the Standard Model (SM), as they involve quartic gauge-boson couplings already at the tree level. Moreover, they provide an irreducible background to other important SM processes. Despite the corresponding cross sections being much smaller than for diboson processes—extensively studied for triple gauge couplings—their measurements are now entering the precision era at the Large Hadron Collider (LHC), making accurate theoretical predictions indispensable.
In this talk, I will present the computation of the next-to-next-to-leading-order (NNLO) QCD radiative corrections to Wγγ production at the LHC. The calculation is exact, except for the finite part of the two-loop contribution which is computed in leading-colour approximation.
Predictions for the fiducial cross section are presented at a centre-of-mass energy of √s= 13 TeV, and the effects on relevant kinematic distributions are discussed. In line with observations for other multiboson processes involving direct photons, we find sizable corrections.