5 papers
Non-factorisable two-loop contribution to -channel single-top production
Christian Brønnum-Hansen, Jérémie Quarroz, Chen-Yu Wang
We report on a recent computation of the non-factorisable contribution to the two-loop helicity amplitude for -channel single-top production arXiv:2108.09222. This is the last m…
Contribution of third generation quarks to two-loop helicity amplitudes for W boson pair production in gluon fusion
Christian Brønnum-Hansen, Chen-Yu Wang
We compute the contribution of third generation quarks () to the two-loop amplitude for on-shell boson pair production in gluon fusion . We present plots for…
A numerical evaluation of planar two-loop helicity amplitudes for a W-boson plus four partons
Heribertus Bayu Hartanto, Simon Badger, Christian Brønnum-Hansen +1
We present the first numerical results for the two-loop helicity amplitudes for the scattering of four partons and a W-boson in QCD. We use a finite field sampling method to reduce…
Analytic helicity amplitudes for two-loop five-gluon scattering: the single-minus case
Simon Badger, Christian Brønnum-Hansen, Heribertus Bayu Hartanto +1
We present a compact analytic expression for the leading colour two-loop five-gluon amplitude in Yang-Mills theory with a single negative helicity and four positive helicities. The…
Applications of integrand reduction to two-loop five-point scattering amplitudes in QCD
Simon Badger, Christian Brønnum-Hansen, Thomas Gehrmann +4
We review the current state-of-the-art in integrand level reduction for five-point scattering amplitudes at two loops in QCD. We present some benchmark results for the evaluation o…