3 papers
hep-th2020
Sequential Discontinuities of Feynman Integrals and the Monodromy Group
Jacob L. Bourjaily, Holmfridur Hannesdottir, Andrew J. McLeod +2
We generalize the relation between discontinuities of scattering amplitudes and cut diagrams to cover sequential discontinuities (discontinuities of discontinuities) in arbitrary m…
hep-th2019
An -Matrix for Massless Particles
Holmfridur Hannesdottir, Matthew D. Schwartz
The traditional -matrix does not exist for theories with massless particles, such as quantum electrodynamics. The difficulty in isolating asymptotic states manifests itself as i…
hep-ph2018
Infrared Finiteness and Forward Scattering
Christopher Frye, Holmfridur Hannesdottir, Nisarga Paul +2
Infrared divergences have long been heralded to cancel in sufficiently inclusive cross-sections, according to the famous Kinoshita-Lee-Nauenberg theorem which mandates an initial a…