Electron reconstruction and identification efficiency measurements with the ATLAS detector using the 2011 LHC proton–proton collision data

Abstract

Many of the interesting physics processes to be measured at the LHC have a signature involving one or more isolated electrons. The electron reconstruction and identification efficiencies of the ATLAS detector at the LHC have been evaluated using proton–proton collision data collected in 2011 at TeV and corresponding to an integrated luminosity of 4.7 fb. Tag-and-probe methods using events with leptonic decays of and bosons and mesons are employed to benchmark these performance parameters. The combination of all measurements results in identification efficiencies determined with an accuracy at the few per mil level for electron transverse energy greater than 30 GeV.

Search for photonic signatures of gauge-mediated supersymmetry in 8 TeVppcollisions with the ATLAS detector

“…Further details of the reconstruction of electrons can be found in Refs. [62] and [63]. Electron candidates used by these analyses are further required to have p T > 20 GeV and jηj < 2.47.…”

“…[62,63]. The efficiency and its uncertainty are estimated as a function of electron p T and η, leading to an overall uncertainty of AE1.0% on the efficiency of the photon þ l analysis, the only analysis that explicitly requires an electron.…”

Probing the W tb vertex structure in t-channel single-top-quark production and decay in pp collisions at s = 8 $$ \sqrt{s}=8 $$ TeV with the ATLAS detector

“…Electron candidates are reconstructed from isolated energy deposits in the electromagnetic calorimeter which are associated with inner-detector tracks fulfilling strict quality requirements [49]. They are required to satisfy p T > 25 GeV and |η| < 2.47, excluding the barrel-endcap transition region, corresponding to 1.37 < |η| < 1.52.…”

“…Other jet-related uncertainty sources are the modelling of the energy resolution [84] and reconstruction efficiency [54] (both referred to as jet reconstruction uncertainties), and the modelling of the tagging efficiencies of b-quark jets, c-quark jets and light-flavour jets [57,58]. Uncertainties related to leptons come from trigger, identification and isolation efficiencies, as well as from the energy scale and resolution [49,50] (all referred to as lepton reconstruction uncertainties). The uncertainties in the energy scale and resolution corrections applied to leptons and jets are propagated to the computation of the missing transverse momentum.…”

“…In fact, the presence of a third jet is not required in the event selection. Indeed, the additional jet resulting from the spectator bquark originating from the gluon splitting as shown in figure 1 is expected to have a softer p T spectrum and a broader |η| distribution than the b-tagged jet produced in the top-quark decay, and, therefore, is in general not detected.Electron candidates are reconstructed from isolated energy deposits in the electromagnetic calorimeter which are associated with inner-detector tracks fulfilling strict quality requirements [49]. They are required to satisfy p T > 25 GeV and |η| < 2.47, excluding the barrel-endcap transition region, corresponding to 1.37 < |η| < 1.52.…”