Abstract
Electrons play an important role in many physics analyses performed with the ATLAS detector, both in Standard Model measurements and in new physics searches. The electron might also appear in the \(Z \rightarrow \tau \tau \) decay, which is discussed in Chap. 5, in the case when one of the \(\tau \) leptons decays into an electron and two neutrinos. The measurements described in this chapter are performed following the electron selection specific for the \(Z \rightarrow \tau \tau \) analysis and the results are used for the cross section measurement in this channel.
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Notes
- 1.
The missing transverse energy is calculated as a vector sum \(\vec {E}_\mathrm{T }^\mathrm{miss } = \vec {E}_\mathrm{T }^\mathrm{miss }(\mathrm calo ) + \vec {E}_\mathrm{T }^\mathrm{miss }(\mathrm muon ) - \vec {E}_\mathrm{T }^\mathrm{miss }(\mathrm energy\ loss )\), where \(\vec {E}_\mathrm{T }^\mathrm{miss }(\mathrm calo )\) is evaluated from the energy deposits in the calorimeter cells inside topological clusters, \(\vec {E}_\mathrm{T }^\mathrm{miss }(\mathrm muon )\) is the sum of the muon momenta and \(\vec {E}_\mathrm{T }^\mathrm{miss }(\mathrm energy\ loss )\) is a correction term accounting for the muons’ energy lost in the calorimeters.
- 2.
So-called loose truth matching of the electron is required in the Monte Carlo samples. The loose truth matching includes these cases: First, the electron track in the inner detector is directly matched to the primary electron. Second, electrons are indirectly matched to the true primary electron, meaning that hits in the inner detector correspond to the electron track generated by bremsstrahlung photons or final state radiation photons from the hard process itself. On the contrary, the tracks belonging to charged hadrons or photons conversions from \(\pi ^0\) decays in hadronic jets are omitted by the loose truth matching. This is the desired behaviour since events with a jet being mismeasured as an electron contribute to the so-called the multijet background and are removed by the background subtraction procedure.
References
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The GEANT4 Collaboration, S. Agostinelli et al., GEANT4: A simulation toolkit. Nucl. Instrum. Meth. A506, 250 (2003)
The ATLAS Collaboration, Luminosity public results (2011), https://twiki.cern.ch/twiki/bin/view/AtlasPublic/LuminosityPublicResults
The ATLAS Collaboration, G. Aad et al., Identification efficiency measurement for electrons with transverse energy between 7 and 50 GeV, ATL-COM-PHYS-2011-1669 (2011)
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Novakova, J. (2014). Electron Efficiency Measurement. In: Standard Model Measurements with the ATLAS Detector. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-319-00810-3_4
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DOI: https://doi.org/10.1007/978-3-319-00810-3_4
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