Event reconstruction algorithms for the ATLAS trigger

ATLAS COLLABORATION, T. FONSECA, MT DOVA ET AL

Journal of Physics: Conference Series

IOP

Año: 2008 vol. 119 p. 1 - 4

1742-6588

The ATLAS experiment under construction at CERN is due to begin operation at the end of 2007. The detector will record the results of proton-proton collisions at a centerof- mass energy of 14 TeV. The trigger is a three-tier system designed to identify in real-time potentially interesting events that are then saved for detailed oine analysis. The trigger system will select approximately 200 Hz of potentially interesting events out of the 40 MHz bunch-crossing rate (with 109 interactions per second at the nominal luminosity). Algorithms used in the trigger system to identify dierent event features of interest will be described, as well as their expected performance in terms of selection eciency, background rejection and computation time per event. The talk will concentrate on recent improvements and on performance studies, using a very detailed simulation of the ATLAS detector and electronics chain that emulates the raw data as it will appear at the input to the trigger system.