Numerical stability in hard and infrared regions in OpenLoops2
by
Edificio U2, Aula 5017
Dipartimento di Fisica G. Occhialini, U2, Università degli Studi di Milano-Bicocca
I will introduce the new OpenLoops release "OpenLoops2", a fully
automated algorithm for extreme one-loop computations. This new release
features public libraries for complete one-loop corrections in the SM
using a new helicity treatment and a new reduction method for tree-loop
interferences.
The simplicity and flexibility of the so-called on-the-fly reduction
allows to isolate numerical instabilities in the amplitude for critical
phase-space regions. I will address in detail sources of numerical
instabilities in hard and infrared regions in the before mentioned
framework and present analytic and numerical methods to cure them.
Finally, I will present performance and stability benchmarks and compare
with other state-of-the art reduction methods.