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Topological cell clustering in the ATLAS calorimeters and its performance in LHC Run 1

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  • ATLAS Collaboration
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Article number490
<mark>Journal publication date</mark>07/2017
<mark>Journal</mark>European Physical Journal C: Particles and Fields
Issue number7
Volume77
Number of pages73
<mark>State</mark>Published
<mark>Original language</mark>English

Abstract

The reconstruction of the signal from hadrons and jets emerging from the proton–proton collisions at the Large Hadron Collider (LHC) and entering the ATLAS calorimeters is based on a three-dimensional topological clustering of individual calorimeter cell signals. The cluster formation follows cell signal-significance patterns generated by electromagnetic and hadronic showers. In this, the clustering algorithm implicitly performs a topological noise suppression by removing cells with insignificant signals which are not in close proximity to cells with significant signals. The resulting topological cell clusters have shape and location information, which is exploited to apply a local energy calibration and corrections depending on the nature of the cluster. Topological cell clustering is established as a well-performing calorimeter signal definition for jet and missing transverse momentum reconstruction in ATLAS.