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ATLAS Note
Report number	ATL-PHYS-PROC-2011-018
Title	Performance of Tau Trigger and Tau Reconstruction in ATLAS in pp Collisions at $\sqrt{s}$=7 TeV
Author(s)	Wolter, Marcin (Cracow, INP)
Collaboration	on behalf of the ATLAS Collaboration
Publication	2011
Imprint	14 Mar 2011
Number of pages	11
In:	Acta Phys. Pol. B 42 (2011) pp.1689-1698
In:	Cracow Epiphany Conference on the First Year of the LHC, Cracow, Poland, 10 - 12 Jan 2011, pp.1689-1698
DOI	10.5506/APhysPolB.42.1689
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	tau performance ; tau fake rate ; TAUPERF
Abstract	Tau leptons provide a useful signature in searches for new physics phenomena in ATLAS experiment, like charged Higgs bosons or supersymmetry. The Standard Model processes with tau leptons are important backgrounds in such searches and also can be used to calibrate the detector and demonstrate the tau identification feasibility. The data collected at centre-of-mass energy of sqrt{s} = 7 TeV recorded with the ATLAS detector are used to study the reconstruction and identification algorithms for hadronic tau decays. Their performance in data and Monte Carlo is compared and a good agreement is observed. The first observation of W->tau nu decays is presented. The observed excess of data events over the total background is compatible with Standard Model signal expectation. Also the plans for measuring tau identification efficiency using Z->tau tau signal events are discussed.
Related document	Slides ATL-PHYS-SLIDE-2011-024
Copyright/License	Preprint: (License: CC-BY-4.0)

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