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#language en

= Introduction =
Electron reconstruction in ATLAS combines the information from the Inner detector and the electromagnetic calorimeter. The electron identification and trigger efficiencies are crucial for benchmark processes W,Z in early data.

= The Tag-and-Probe Method =

Comments on the [[https://twiki.cern.ch/twiki/bin/viewauth/AtlasProtected/InsituPerformance | InsituPerformance]] framework.

== Selection Criteria ==
{{attachment:Cuts.png || height= 350,width=700}}

== Fit Signal and Background ==
Extended Maximum Likelihood (EML) :

{{attachment:SignalPdf.png || width=400 }}

Breit-Wigner: <<latex($$BW(M_Z, \Gamma_Z; M_{ee}) = \frac{\Gamma_Z}{2\pi} \frac{1}{(M_{ee} - M_Z)^2 + \Gamma_Z^2}$$)>>

Approximate parton luminosity term: <<latex($$( \frac{M_Z}{M_{ee}} )^\beta$$)>>

Crystal Ball: <<latex($$A$$)>>

== Datasets ==
{{attachment:Datasets.png || width=700}}


= Results =
= Systematics =