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Top quark contribution to two-loop helicity amplitudes for $Z$ boson pair production in gluon fusion
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abstract
We compute the top quark contribution to the two-loop amplitude for on-shell $Z$ boson pair production in gluon fusion, $gg \to ZZ$. Exact dependence on the top quark mass is retained. For each phase space point the integral reduction is performed numerically and the master integrals are evaluated using the auxiliary mass flow method, allowing fast computation of the amplitude with very high precision.
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Cited by 1 Pith paper
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Theoretical modeling of QCD radiation in off-shell Higgs production through gluon fusion
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.
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