A likelihood-based reconstruction algorithm for top-quark pairs and the KLFitter framework

A likelihood-based reconstruction algorithm for arbitrary event topologies is introduced and, as an example, applied to the single-lepton decay mode of top-quark pair production. The algorithm comes with several options which further improve its performance, in particular the reconstruction efficien...

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Bibliographic Details
Published in:Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Accelerators, spectrometers, detectors and associated equipment, 2014-06, Vol.748, p.18-25
Main Authors: Erdmann, Johannes, Guindon, Stefan, Kröninger, Kevin, Lemmer, Boris, Nackenhorst, Olaf, Quadt, Arnulf, Stolte, Philipp
Format: Article
Language:English
Subjects:
Accelerators
Algorithms
Decay
Detectors
Jets
Kinematic fit
Modular
Reconstruction
Top-quark physics
Top-quark reconstruction
Topology
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Summary:A likelihood-based reconstruction algorithm for arbitrary event topologies is introduced and, as an example, applied to the single-lepton decay mode of top-quark pair production. The algorithm comes with several options which further improve its performance, in particular the reconstruction efficiency, i.e., the fraction of events for which the observed jets and leptons can be correctly associated with the final-state particles of the corresponding event topology. The performance is compared to that of well-established reconstruction algorithms using a common framework for kinematic fitting. This framework has a modular structure which describes the physics processes and detector models independently. The implemented algorithms are generic and can easily be ported from one experiment to another.
ISSN:0168-9002
1872-9576
DOI:10.1016/j.nima.2014.02.029