Top-pair production via gluon fusion in the Standard Model effective field theory

We compute the leading corrections to the differential cross section for top-pair production via gluon fusion due to third-generation dimension-six operators at leading order in QCD. The Standard Model fields are assumed to couple only weakly to the hypothetical new sector. A systematic approach then suggests treating single insertions of the operator class containing gluon field strength tensors on the same footing as explicitly loop suppressed contributions from four-fermion operators. This is in particular the case for the chromomagnetic operator Q((uG)) and the purely bosonic operators Q((G)) and Q((phi,G)). All leading order dimension-six contributions are consequently suppressed with a loop factor 1/16 pi(2).

Automated summary

The leading corrections to the differential cross section for top-pair production via gluon fusion due to third-generation dimension-six operators were computed at leading order in QCD. A systematic approach was used to treat single insertions of operators containing gluon field strength tensors, as well as explicitly loop suppressed contributions. All leading order dimension-six contributions were consequently suppressed with a loop factor 1/16 pi(2).