Complete NLO QCD Corrections to ZZ Production in Gluon Fusion

Particle Physics Theory seminar

Complete NLO QCD Corrections to ZZ Production in Gluon Fusion

  • Event time: 2:00pm until 3:00pm
  • Event date: 22nd April 2024
  • Speaker: Bakul Agarwal (KIT)
  • Location: Room 5326,

Event details

We calculate the complete NLO QCD corrections to loop-induced gg → ZZ production including full top-quark mass effects. The two-loop virtual corrections are obtained by combining analytic results for the massless, Higgs-mediated, and one-loop factorizable contributions with numerically computed amplitudes containing the top-quark mass. We show that the choice of subtraction scheme for the virtual contribution impacts the precision with which the virtual contribution must be evaluated in order to obtain sufficiently precise phenomenological predictions. For direct production through a massive top-quark loop, we observe that the relative NLO corrections are large. The direct massive and Higgs-mediated contributions individually increase relative to the massless production at high diboson invariant mass, but interfere destructively with each other. At the Large Hadron Collider, the NLO corrections to the gluon channel give a sizable contribution to the pp → ZZ + X cross-section at N3LO.

About Particle Physics Theory seminars

The Particle Physics Theory seminar is a weekly series of talks reflecting the diverse interests of the group. Topics include analytic and numerical calculations based on the Standard Model of elementary particle physics, theories exploring new physics, as well as more formal developments in gauge theories and gravity..

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