Jun 24 – 28, 2019
Crowne Plaza Brussels Le Palace
Europe/Zurich timezone

Casual thresholds and infrared singularities in the forest

Jun 25, 2019, 5:00 PM
Eva/Inno (1st floor)


1st floor


German Rodrigo (IFIC UV-CSIC)


We present the first comprehensive analysis of the unitarity thresholds and anomalous thresholds of scattering amplitudes at two loops and beyond based on the loop-tree duality, and show how non-causal unphysical thresholds are locally cancelled in an efficient way when the forest of all the dual on-shell cuts is considered as one. We also prove that soft and collinear singularities at two loops and beyond are restricted to a compact region of the loop three-momenta, which is a necessary condition for implementing a local cancellation of loop infrared singularities with the ones appearing in real emission; without relying on a subtraction formalism.

Primary authors

German Rodrigo (IFIC UV-CSIC) J. Jesus Aguilera Verdugo (IFIC UV-CSIC) Félix Driencourt-Mangin (IFIC UV-CSIC) Judith Plenter (IFIC UV-CSIC) Selomit Ramirez Uribe (IFIC UV-CSIC) German F. R. Sborlini (IFIC UV-CSIC) Dr William J. Torres Bobadilla (IFIC UV-CSIC) Szymon Tracz (IFIC UV-CSIC)

Presentation materials