Report

PUBDB-2021-05555

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Towards tuning electromagnetic shower properties to data with AtlFast3

ATLAS Collaboration (Collaboration author)DESY*

2021

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Please use a persistent id in citations: doi:10.3204/PUBDB-2021-05555

Report No.: ATL-SOFT-PUB-2021-004

Abstract: A precise simulation of electromagnetic shower properties in the ATLAS calorimeter is crucial for the identification of particle showers originating from electrons and photons. AtlFast3, the next-generation of fast simulation in ATLAS, precisely simulates the properties of electromagnetic showers, but is limited by the accuracy of the full Geant4 simulation, upon which its parametrization is based. Differences between the Geant4 simulation and data collected by the ATLAS detector are well known but insufficiently understood. This note shows that AtlFast3 can be tuned to accurately describe the shower shapes observed in data and describes the underlying models that are employed to outperform Geant4.

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Contributing Institute(s):

1. LHC/ATLAS Experiment (ATLAS)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)

Experiment(s):

1. LHC: ATLAS

Appears in the scientific report 2021

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