CERN Accelerating science

Internal Note and Article
Report number	ATL-DAQ-PUB-2006-003 ; ATL-COM-DAQ-2005-044
Title	Implementation and performance of a tau lepton selection within the ATLAS trigger system at the LHC
Author(s)	Casado, M P (Barcelona, IFAE) ; Dos Anjos, A (Barcelona, IFAE) ; Armstrong, S (Barcelona, IFAE) ; Baines, J T M (Barcelona, IFAE) ; Bee, C P (Barcelona, IFAE) ; Biglietti, M (Barcelona, IFAE) ; Bogarets, A (Barcelona, IFAE) ; Bosman, M (Barcelona, IFAE) ; Caron, B (Barcelona, IFAE) ; Cataldi, G (Barcelona, IFAE) ; Cavalli, D (Barcelona, IFAE) ; Comune, G (Barcelona, IFAE) ; Conde, P (Barcelona, IFAE) ; Crone, G (Barcelona, IFAE) ; Damazio, D (Barcelona, IFAE) ; De Santo, A (Barcelona, IFAE) ; Díaz-Gómez, M (Barcelona, IFAE) ; Di Mattia, A (Barcelona, IFAE) ; Ellis, Nick (Barcelona, IFAE) ; Emeliyanov, D (Barcelona, IFAE) ; Epp, B (Barcelona, IFAE) ; Falciano, S (Barcelona, IFAE) ; Garitaonandia, H (Barcelona, IFAE) ; George, S (Barcelona, IFAE) ; Ghete, V (Barcelona, IFAE) ; Goncalo, R (Barcelona, IFAE) ; Haller, J (Barcelona, IFAE) ; Kabana, S (Barcelona, IFAE) ; Khomich, A (Barcelona, IFAE) ; Kilvington, G (Barcelona, IFAE) ; Kirk, J (Barcelona, IFAE) ; Konstantinidis, N P (Barcelona, IFAE) ; Kootz, A (Barcelona, IFAE) ; Lankford, A J (Barcelona, IFAE) ; Lowe, A (Barcelona, IFAE) ; Luminari, L (Barcelona, IFAE) ; Maeno, T (Barcelona, IFAE) ; Massik, J (Barcelona, IFAE) ; Messen, C (Barcelona, IFAE) ; Mello, A G (Barcelona, IFAE) ; Moore, R (Barcelona, IFAE) ; Morettini, P (Barcelona, IFAE) ; Negri, A (Barcelona, IFAE) ; Nikitin, N (Barcelona, IFAE) ; Nisati, A (Barcelona, IFAE) ; Osuna, C (Barcelona, IFAE) ; Padilla, C (Barcelona, IFAE) ; Panikashvilli, N (Barcelona, IFAE) ; Parodi, F (Barcelona, IFAE) ; Pasqualucci, E (Barcelona, IFAE) ; Pérez-Réale, V (Barcelona, IFAE) ; Pinfold, J L (Barcelona, IFAE) ; Pinto, P (Barcelona, IFAE) ; Qian, Z (Barcelona, IFAE) ; Resconi, S (Barcelona, IFAE) ; Rosati, S (Barcelona, IFAE) ; Sánchez, C (Barcelona, IFAE) ; Santamarina-Rios, C (Barcelona, IFAE) ; Scannicchio, D A (Barcelona, IFAE) ; Schiavi, C (Barcelona, IFAE) ; Segura, E (Barcelona, IFAE) ; De Seixas, J M (Barcelona, IFAE) ; Sivoklokov, S Yu (Barcelona, IFAE) ; Sobreira, A (Barcelona, IFAE) ; Soluk, R A (Barcelona, IFAE) ; Stefanidis, E (Barcelona, IFAE) ; Sushkov, S (Barcelona, IFAE) ; Sutton, M (Barcelona, IFAE) ; Tapprogge, S (Barcelona, IFAE) ; Tarem, S (Barcelona, IFAE) ; Thomas, E (Barcelona, IFAE) ; Touchard, F (Barcelona, IFAE) ; Usai, G (Barcelona, IFAE) ; Venda-Pinto, B (Barcelona, IFAE) ; Ventura, A (Barcelona, IFAE) ; Vercesi, V (Barcelona, IFAE) ; Wengler, T (Barcelona, IFAE) ; Werner, P (Barcelona, IFAE) ; Wheeler, S J (Barcelona, IFAE) ; Wickens, F J (Barcelona, IFAE) ; Wiedenmann, M (Barcelona, IFAE) ; Wielers, M (Barcelona, IFAE) ; Zobernig, H (Barcelona, IFAE)
Collaboration	ATLAS High-Level Trigger Group
Publication	2006
Imprint	17 Oct 2005
In:	9th ICATPP Conference on Astroparticle, Particle, Space Physics, Detectors and Medical Physics Applications, Como, Italy, 17 - 21 Oct 2005, pp.546-550
DOI	10.1142/9789812773678_0089
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	A->tau tau-> electron hadron ; tau trigger at the LHC ; Tau trigger
Abstract	The ATLAS experiment at the Large Hadron Collider (LHC) has an interaction rate of up to $10^9$ Hz. The trigger must efficiently select interesting events while rejecting the large amount of background. The First Level trigger will reduce this rate to around $O(75$ kHz $)$. Subsequently, the High Level Trigger (HLT), comprising the Second Level trigger and the Event Filter, will reduce this rate by a factor of $O(10^3)$. Triggering on taus is important for Higgs and SUSY searches at the LHC. In this paper tau trigger selections are presented based on a lepton trigger if the tau decays leptonically or via a dedicated tau hadron trigger if the tau disintegrates semileptonically. We present signal efficiency with the electron trigger using the data sample $A\rightarrow \tau \tau \rightarrow e \, hadron$, and rate studies obtained from the dijet sample.
Copyright/License	Preprint: (License: CC-BY-4.0)

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