ACAT 2021

AtlFast3: The next generation of fast simulation in ATLAS

contribution ID 763

30 Nov 2021, 18:00

20m

Auditorium (Virtual and IBS Science Culture Center, Daejeon, South Korea)

Oral Track 2: Data Analysis - Algorithms and Tools Track 2: Data Analysis - Algorithms and Tools

Speaker

Joshua Falco Beirer (CERN, Georg-August-Universitaet Goettingen (DE))

Description

AtlFast3 is the next generation of high precision fast simulation in ATLAS. It is being deployed by the collaboration and will replace AtlFastII, the fast simulation tool that was successfully used until now. AtlFast3 combines two Fast Calorimeter Simulations tools; a parameterization-based approach and a machine-learning based tool exploiting Generative Adversarial Networks (GANs). AtlFast3 provides improved agreement with Geant4 for objects used in analyses, with a focus on those that were poorly modelled in AtlFastII. In particular, the simulation of jets of particles reconstructed with large radii and the detailed description of their substructure, are significantly improved in AtlFast3. The modelling and performance are evaluated on events produced at 13 TeV centre-of-mass energy in the Run-2 data-taking conditions.

References

https://arxiv.org/abs/2109.02551

Presentation materials

ACAT_2021_Beirer.pdf

Recording