SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 122: DAQ Systems

T 122.2: Vortrag

Donnerstag, 23. März 2023, 16:05–16:20, POT/0106

Anomaly detection for the level 1 trigger system of the CMS experiment — •Sven Bollweg, Karim El Morabit, Lars Emmrich, Gregor Kasieczka, and Artur Lobanov — University of Hamburg, Germany

There exist strong hints for the existence of physics beyond the standard model (BSM). At the CMS experiment, the first event selection step is the Level 1 (L1) trigger system, which decides whether an event is stored for further analysis. Assuming that BSM events differ from standard model (SM) events, a trigger decision could then utilize this difference to detect anomalous event properties instead of being fully based on model specific criteria.

This talk discusses such an anomaly detection trigger based on neural networks. An autoencoder (AE) network is trained to reproduce typical collision events. It is found that the reconstuction quality of anomalous events, such as BSM events or rare SM events, is decreased. This decrease in reproduction quality can then be used as a basis for the trigger decision. Since the L1 trigger has a very limited time for the decision, the AE needs to be deployed on dedicated hardware in the form of field programmable gate arrays which presents additional challenges.