Software Performance of the ATLAS Track Reconstruction for LHC Run 3

Ferrando, James (2024) Software Performance of the ATLAS Track Reconstruction for LHC Run 3. Computing and Software for Big Science, 8 (1): 9. ISSN 2510-2036

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Abstract

Charged particle reconstruction in the presence of many simultaneous proton–proton ($$p {} p $$ p p ) collisions in the LHC is a challenging task for the ATLAS experiment’s reconstruction software due to the combinatorial complexity. This paper describes the major changes made to adapt the software to reconstruct high-activity collisions with an average of 50 or more simultaneous $$p {} p $$ p p interactions per bunch crossing (pile-up) promptly using the available computing resources. The performance of the key components of the track reconstruction chain and its dependence on pile-up are evaluated, and the improvement achieved compared to the previous software version is quantified. For events with an average of $$60~p {} p $$ 60 p p collisions per bunch crossing, the updated track reconstruction is twice as fast as the previous version, without significant reduction in reconstruction efficiency and while reducing the rate of combinatorial fake tracks by more than a factor two.

Item Type:
Journal Article
Journal or Publication Title:
Computing and Software for Big Science
Additional Information:
M1 - 9
ID Code:
219048
Deposited By:
Deposited On:
30 Apr 2024 10:10
Refereed?:
Yes
Published?:
Published
Last Modified:
26 Sep 2024 11:26