# The High-Level-Trigger Steering of the ATLAS Experiment

Abstract : The ATLAS experiment at the Large Hadron Collider (LHC) will face the challenge of efficiently selecting interesting candidate events in pp collisions at 14 TeV centre-of-mass energy, whilst rejecting the enormous number of background events. The High-Level-Trigger (HLT $=$ second level trigger and Event Filter), which is a software based trigger will need to reduce the first level trigger output rate of ${sim}75$ kHz to ${sim}200$ Hz written out to mass storage. In this paper an overview of the steering mechanism of the HLT is given. The HLT Steering is responsible for the scheduling of algorithms and for the global event trigger decision evaluation. The concept of step-wise and seeded selection strategy implemented by the steering will be presented. Integration of large number of trigger menus and sophisticated physics selection strategies will also be discussed. The electron and photon menus will be described to demonstrate that the trigger is well adapted for the physics program at the LHC.
Document type :
Conference papers

http://hal.in2p3.fr/in2p3-00260449
Contributor : Claudine Bombar <>
Submitted on : Tuesday, March 4, 2008 - 11:22:51 AM
Last modification on : Tuesday, December 22, 2020 - 12:26:05 PM

### Citation

N. Berger, T. Bold, T. Eifert, G. Fischer, S. George, et al.. The High-Level-Trigger Steering of the ATLAS Experiment. 15th IEEE NPSS Real Time Conference (RT07), Apr 2007, Batavia, United States. pp.165-171, ⟨10.1109/TNS.2007.913483⟩. ⟨in2p3-00260449⟩

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