CERN Accelerating science

ATLAS Note
Report number	ATL-DAQ-PUB-2011-001
Title	The implementation of the ATLAS missing Et triggers for the initial LHC operation
Author(s)	Casadei, D (NYU) ; Aracena, I (SLAC) ; Banerjee, S (Victoria) ; Beauchemin, P-H (Oxford) ; Calvet, S (Mainz) ; Cranmer, K (NYU) ; Damazio, D (BNL) ; Djilkibaev, R (NYU) ; Eifert, T (Geneve, CERN) ; Hillier, S (Birmingham) ; Idarraga, J (Montreal) ; Johns, K (Arizona) ; Kaushik, V (Arizona) ; Konoplich, R (NYU) ; Kowalewski, RV (Victoria) ; Lei, X (Arizona) ; Mann, A (Georg-August-Universitaet Goettingen) ; Mermod, P (Oxford) ; Mincer, A (NYU) ; Morel, J (Georg-August-Universitaet Goettingen) ; Nemethy, P (NYU) ; Pinder, A (Oxford) ; Taylor, RP (Victoria) ; Watson, A (Birmingham) ; Zhao, L (NYU)
Corporate Author(s)	The ATLAS collaboration
Publication	2011
Imprint	22 Feb 2011
Number of pages	mult.
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Abstract	The trigger system of the ATLAS detector is a three-level architecture in which the decision is taken by custom electronics at the first level whereas the following levels operate in a software environment that is similar to the offline reconstruction program. This paper describes the missing transverse energy (\MET) triggers in ATLAS for the first data taking in 2009 and 2010 LHC runs, in particular providing the first public documentation of their implementation at all trigger levels.
Scientific contact person	Casadei, D, (Diego.Casadei@cern.ch)
Copyright/License	Preprint: (License: CC-BY-4.0)

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