Measurements of the Electron Reconstruction and Identification Efficiencies in ATLAS

Isolated, high-energy electrons constitute a very clean signature at hadron collider experiments. As the final states of many Standard Model processes, as well as physics beyond the Standard Model, analyses at the ATLAS experiment heavily rely on electrons. A precise knowledge of the efficiency to correctly reconstruct and identify these electrons is thus important. In this contribution the measurement of these efficiencies is described. It is performed with a tag-and-probe method using $Z$ and $J/\psi$ decays to electrons in $20.3\,\mathrm{fb}^{-1}$ of $pp$ collisions recorded in 2012 at $\sqrt{s}=8$ TeV. The combination of the measurements results in identification efficiencies determined with an accuracy of a few per mil for electrons with a transverse energy of $E_{\mathrm{T}}>30$ GeV.