ATLAS Electron Reconstruction Activities

The remarkable discovery of the Higgs boson in the experimentally harsh LHC environment would not have been possible without the deep understanding of the detector performance and optimisation of the reconstruction and identification algorithms.

An electron or photon is reconstructed using energy deposits in the calorimeter (clusters). For electron inner detector tracks are matched to the cluster providing information on the particle’s origin and direction and therefore of its momentum

Members of the Sheffield ATLAS group have been playing a leading role in the area electron performance and co-ordinated the development of the new electron reconstruction algorithm used by the ATLAS experiment in the Higgs discovery. This improved electron reconstruction resulted of 30% in the expected sensitivity for the Higgs discovery in the H → ZZ(*) → 4l channel.

Currently, members of the Sheffield ATLAS group are leading the electron and photon reconstruction, identification and energy calibration group of the ATLAS Collaboration.

Sketch of a reconstructed electron in the ATLAS detector

electron sketch

Improved Electron Reconstruction employed for the Higgs boson discovery

EffvsPt

Measured reconstruction efficiencies as a function of ET integrated over the full pseudorapidity range for the 2011 (triangles) and the 2012 (circles) datasets. Members of the Sheffield ATLAS group led the effort that increased the electron reconstruction efficiency in 2012.

EffvsEta

Measured reconstruction efficiencies as a function of of η for 15 GeV < ET < 50 GeV (right) for the 2011 (triangles) and the 2012 (circles) datasets.for the 2011 (triangles) and the 2012 (circles) datasets. Members of the Sheffield ATLAS group led the effort that increased the electron reconstruction efficiency in 2012.

Public e/γ results (link)



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