CERN Accelerating science

ATLAS Note
Report number	ATL-DAQ-PROC-2009-029
Title	Implementation and Performance of the ATLAS Jet Trigger
Author(s)	Conde-Muíño, P (Lisbon, LIFEP)
Collaboration	on behalf of the ATLAS TDAQ Collaboration
Imprint	29 Sep 2009. - 3 p.
In:	PoS EPS-HEP2009 (2009) 470
In:	2009 Europhysics Conference on High Energy Physics, Krakow, Poland, 16 Jul - 22 Jul 2009, pp.470
DOI	10.22323/1.084.0470
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	Jets ; trigger ; performance ; atlas
Abstract	ATLAS is one of the main experiments at the LHC. Its trigger system has been designed to be flexible in order to cover a wide range of physics topics, while reducing the rate from the nominal 40 MHz to about 200 Hz. In order to achieve this, the ATLAS trigger system searches for high pT objects, like leptons, jets, photons, or missing transverse energy. The jet trigger starts at the first level trigger with dedicated processors that search for high ET hadronic energy depositions. At the second level trigger, the jet signatures are verified with the execution of a dedicated, fast cone reconstruction algorithm followed by a simple calibration scheme. In the third level trigger any of the offline jet reconstruction algorithms can be used. In this paper we will present the challenges of the jet trigger, describing the implementation and the expected performance.
Copyright/License	CC-BY-NC-SA-3.0

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