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ATLAS Note
Report number	ATLAS-CONF-2010-073
Title	Observation of inclusive electrons in the ATLAS experiment at $\sqrt{s} = 7$ TeV.
Corporate Author(s)	The ATLAS collaboration
Collaboration	ATLAS Collaboration
Imprint	28 Jul 2010. - 22 p.
In:	35th International Conference on High Energy Physics, Paris, France, 22 - 28 Jul 2010
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	Electrons, TRT, EM calorimeter, heavy flavour semileptonic decays ; EGAMMA
Abstract	This note presents the first observation of inclusive electrons in the collision data collected by the ATLAS experiment at $sqrt{s} =$ 7 TeV, corresponding to a total integrated luminosity of 13.8$\pm$1.5 nb$^{-1}$. From a sample of 67124 selected electron candidates, a signal of $9920 \pm 160$ (stat) $\pm 990$ (syst.) electrons, predominantly from heavy flavour production (semi-leptonic decays of charm and beauty hadrons), is extracted using a combination of particle identification techniques to determine the dominant hadron and conversion background contributions from data. This signal is compared to expectations from parton shower leading-order Monte Carlo simulations.

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