Numerical Multi-loop Computations & Photon pair production in gluon fusion

by Stephen Philip Jones (CERN)

Wednesday 20 Nov 2019, 11:10 → 12:10 Europe/Zurich

Edificio U2, Aula 5017 (Dipartimento di Fisica G. Occhialini, U2, Università degli Studi di Milano-Bicocca)

In recent years, significant progress has been made in the application of numerical techniques to the computation of multi-loop Feynman integrals. These developments have enabled the computation of higher order perturbative corrections to key processes at the LHC and future colliders. In the first part of this talk, we will introduce and review advances in the use of one such numerical technique, namely sector decomposition. We will describe a publicly available tool (pySecDec) which automates the application of sector decomposition to dimensionally regulated parameter integrals and discuss how it can be used effectively. In the second part of the talk, the recent use of these tools and techniques to compute photon pair production in gluon fusion at NLO including top quark effects will be presented. After matching the fixed order results to a threshold expansion, we briefly discuss the possibility of determining the top quark mass from precision measurements of the di-photon invariant mass spectrum.

 

sjones_milan.pdf