Event generators' and N(n)LO codes' acceleration

Session

NNLO and beyond

14 Nov 2023, 15:00

4/3-006 - TH Conference Room (CERN)

26. Computer algebra challenges in precision calculations

Thomas Gehrmann (Univ. Zurich), Thomas Kurt Gehrmann (University of Zurich (CH))

14/11/2023, 15:00

27. Numerical challenges in precision calculations

Alexander Yohei Huss (CERN)

14/11/2023, 15:20

18. pySecDec: Experiences Evaluating Multi-loop Amplitudes on GPUs

Stephen Philip Jones (University of Durham (GB))

14/11/2023, 16:15

In this talk, I will review some of our experiences implementing the evaluation of multi-loop integrals and multi-loop amplitudes on GPUs using the sector decomposition method. I will highlight recent developments and how they have impacted the performance of this method and I will summarise some of the main lessons learned. Additionally, I will briefly comment on potential avenues/obstacles...

19. Profiling NNLO+PS simulations: GENEVA as a case study

Simone Alioli (Universita & INFN, Milano-Bicocca (IT))

14/11/2023, 16:45

In this talk I will review the stages and parallelization strategies used in NNLO+PS simulations, focusing on the GENEVA Monte-Carlo code. Concentrating on three benchmark processes, Drell-Yan, Higgs production via gluon fusion and diboson production, I will report results of a profiling exercise aimed at identifying the current bottlenecks in each stage that will benefit the most from...

21. Issues in the parallelization of physics algorithms on GPU

Alessandro Vicini (Università degli Studi e INFN Milano (IT))

14/11/2023, 17:15

I will briefly report on two distinct attempts to port on GPU an algorithm commonly used in the evaluation of radiative corrections to particle scattering processes:
1) the reconstruction of a rational function, useful in the exact numerical solution of the linear systems typically present in multi-loop calculations;
2) the generation of events via a parton-shower algorithm.
In both cases...