Nagoya University
Theoretical Elementary Particle Physics Laboratory

Date&Time Wed Jan 18 2023 (13:00 - 14:00)
Kentarou Mawatari
Affiliation Iwate University
Title Helicity amplitudes without gauge cancellation in the Feynman-diagram gauge
Abstract We recently showed that tree-level scattering amplitudes of the standard model can be expressed in a form which is free from subtle gauge-theory cancellation among interfering Feynman diagrams. We call the specific form of the gauge boson propagators in the amplitudes as ‘Feynman-diagram (FD) gauge'. We implemented this new form in the numerical helicity amplitude calculation code HELAS. In this talk, we present results in the FD gauge for several high-energy scattering processes where subtle gauge-theory cancellation among diagrams takes place in all the other known approaches. The talk is based on our recent papers; ArXiv:2003.03003, 2203.10440, 2211.14562
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