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Virtual QCD corrections to $gg \to ZZ$: top-quark loops from a transverse-momentum expansion

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arxiv 2404.15113 v1 pith:TVEPF6B6 submitted 2024-04-23 hep-ph

Giuseppe Degrassi , Ramona Gröber , Marco Vitti This is my paper · ORCID
classification hep-ph
keywords expansioncorrectionsloopsorderresultstop-quarkvirtualallow
verification ladder T0 review T1 audit T2 compute T3 formal

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abstract

We present the virtual corrections due to the top-quark loops for the process $gg \to ZZ$ at next-to-leading order in QCD. The associated two-loop box diagrams are computed using a small-transverse-momentum expansion. Our results are then merged with those available in the complementary energy region, obtained via a high-energy expansion, in order to provide an analytic result that is valid in the whole phase space. The results presented allow for an efficient modelling of the signal--background interference as well as the irreducible background in off-shell Higgs production.

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Forward citations

Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. All planar three-loop Feynman integrals for the production of two vector bosons at hadron colliders

    hep-ph 2025-12 accept novelty 6.0 of 10

    All nine planar three-loop four-point integral families for two massive external legs are cast into canonical differential equations and evaluated numerically, completing the set needed for leading-colour N3LO diboson...

  2. Two-loop QCD corrections to $ZH$ and off-shell $Z$ boson pair production in gluon fusion

    hep-ph 2025-09 conditional novelty 6.0 of 10

    The paper provides fast, analytic two-loop virtual QCD corrections for gluon-induced ZH and off-shell ZZ production with full top-quark mass dependence, validated against numerical results at the sub-percent level.

  3. Theoretical modeling of QCD radiation in off-shell Higgs production through gluon fusion

    hep-ph 2025-06 conditional novelty 6.0 of 10

    A controlled three-generator comparison shows that NLO+PS and LO jet merging differ by up to a factor of two in off-shell gg to H to ZZ to 4l predictions, with MadGraph underproducing sub-leading jets.

  4. ggxy: Fast and flexible NLO QCD corrections to gluon-initiated processes

    hep-ph 2026-07 conditional novelty 5.0 of 10

    The ggxy library implements NLO QCD corrections for gg→ZH and gg→ZZ with full top-quark mass dependence using high-energy and forward-limit expansions, validated against existing results and interfaced to POWHEG for p...

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