3 papers
hep-ph2026
Multi-channel phase space with Feynman-diagram-gauge amplitudes
Kaoru Hagiwara, Junichi Kanzaki, Fabio Maltoni +2
Multi-channel phase space with a single Feynman diagram enhancement is a powerful tool for high-energy physics event generation if a diagram with a singular propagator dominates th…
hep-ph2024
Automatic generation of helicity amplitudes in Feynman-Diagram gauge
Kaoru Hagiwara, Junichi Kanzaki, Olivier Mattelaer +2
We develop a method to calculate helicity amplitudes of an arbitrary tree-level process in Feynman-Diagram (FD) gauge for an arbitrary gauge model with MadGraph5_aMC@NLO. We start…
hep-ph2020
QED and QCD helicity amplitudes in parton-shower gauge
Kaoru Hagiwara, Junichi Kanzaki, Kentarou Mawatari
We introduce photon and gluon propagators in which the scalar polarization component is subtracted systematically by making use of the BRST invariance of the off-shell vector boson…