Topological cell clustering in the ATLAS calorimeters and its performance in LHC Run 1
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 <i>topological cell clusters</i> 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.
Funding
- Harvard University
- Universidad Técnica Federico Santa María
- Justus Liebig Universität Gießen
- Shandong University
- CERN
- Southern Methodist University
- Scottish Universities Physics Alliance
- University of Glasgow
- Universität Heidelberg
- Ministry of Education, Culture, Sports, Science and Technology
- Danmarks Grundforskningsfond
- Fundação de Amparo à Pesquisa do Estado de São Paulo
- National Natural Science Foundation of China
- Bundesministerium für Bildung und Forschung
- Chinese Academy of Sciences
- Austrian Science Fund
- Technische Universität Dresden
- Nederlandse Organisatie voor Wetenschappelijk Onderzoek
- Bundesministerium für Wissenschaft, Forschung und Wirtschaft
- General Secretariat for Research and Technology
- Conselho Nacional de Desenvolvimento Científico e Tecnológico
- Israel Science Foundation
- Tsinghua University
- Max-Planck-Gesellschaft
- Universitatea Transilvania din Brasov
- Ministerstwo Edukacji i Nauki
- Centre National de la Recherche Scientifique
- Shota Rustaveli National Science Foundation
- Shanghai Jiao Tong University
- Universidad de Buenos Aires
- Centre National pour la Recherche Scientifique et Technique
- Université de Genève
- Università della Calabria
- Universidade Federal de Juiz de Fora
- Clermont Université
- Akademia Górniczo-Hutnicza im. Stanislawa Staszica
- Nanjing University
- Universidade Federal do Rio de Janeiro
- University of Science and Technology of China
- Pontificia Universidad Católica de Chile
- Services Fédéraux des Affaires Scientifiques, Techniques et Culturelles
- National Research Center "Kurchatov Institute"
- Technische Universität Dortmund
- Shanghai Key Laboratory for Particle Physics and Cosmology
- Universidade Federal de São João del-Rei
- Natural Sciences and Engineering Research Council of Canada
- Science and Technology Facilities Council
- Deutsches Elektronen-Synchrotron
- Japan Society for the Promotion of Science
- Fundação para a Ciência e a Tecnologia
- Comisión Nacional de Investigación Científica y Tecnológica
- Agencia Nacional de Promoción Científica y Tecnológica
- Israeli Centers for Research Excellence
- Institute of High Energy Physics
- Institut National de Physique Nucléaire et de Physique des Particules
- High Energy Physics
- Nuclear Physics
- Brookhaven National Laboratory
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