$ZZ$ production at the LHC: NLO QCD corrections to the loop-induced gluon fusion channel

Understand

We consider QCD radiative corrections to the production of four charged leptons in hadron collisions.

• We present the computation of the next-to-leading order QCD corrections to the loop-induced gluon fusion contribution.
• Our predictions include, for the first time, also the quark-gluon partonic channels.
• The computed corrections, which are formally of ${\cal O}(\alpha_{\rm s}^3)$, turn out to increase the loop-induced Born-level result by an amount ranging from 75% to 71% as $\sqrt{s}$ ranges from 8 to 13 TeV.