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URN: urn:nbn:de:bsz:25-opus-81689
URL: http://www.freidok.uni-freiburg.de/volltexte/8168/

Horner, Stephan

Search for Supersymmetry in single-lepton final states with the ATLAS detector and Improved background model for the search of new physics

Suche nach Supersymmetry in Einzel-Lepton-Endzuständen mit dem ATLAS-Detektor und Verbessertes Untergrundmodell für die Suche nach Neuer Physik

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Kurzfassung in Englisch

The current understanding of nature at its elementary level is condensed in a physical theory known as the Standard Model. While it has been extraordinarily successful in describing almost all known phenomena in particle physics with astonishing precision since the 1970s, it is also commonly agreed upon that it can only be an approximation of more fundamental laws of physics, which have yet to be discovered. Supersymmetry is an attractive candidate for an extension of the Standard Model since it recovers many of its deficiencies and, maybe, constitutes an important milestone on the road to a theory of everything. There are good reasons to believe that if supersymmetry exists, it will make itself apparent at the so-called weak energy scale. With the start of the Large Hadron Collider, a new era in particle physics has therefore begun, since it will be possible to thoroughly probe this scale for the first time. The experiments at the Large Hadron collider will also search for the last big missing piece of the Standard Model, the elusive Higgs boson, and potentially unveil the cause for the associated electroweak symmetry breaking, which gives rise to the masses of the particles and may well be connected with supersymmetry. This thesis presents the author’s contribution to the search for supersymmetry in final states which contain a single high-energetic electron or muon, using data recorded by the ATLAS experiment until the end of 2010.
A crucial prerequisite for the search for supersymmetry or any other new physics phenomenon is the precise simulation of known Standard Model processes. Due to shortcomings in the modeling or an incomplete understanding of detector effects, the measurements will always systematically deviate from the predictions. A novel method, which incorporates such deviations into an improved model, is presented. It combines information from the simulation and from the data, obtained by control measurements, in a statistically well-defined manner.

Kurzfassung in Deutsch

Diese Dissertation präsentiert den Beitrag des Autors zur Suche nach supersymmetrischen Teilchen in Endzuständen mit genau einem hochenergetischen Lepton, verursacht durch Proton-Proton-Kollision am ATLAS-Experiment des Large Hadron Colliders. Darüberhinaus wird eine neue Methode zur Verbesserung der Untergrundmodelle in einer Suche nach neuer Physik vorgestellt.

SWD-Schlagwörter: Supersymmetrie , ATLAS <Teilchendetektor> , LHC , CERN , Elementarteilchenphysik , Hochenergiephysik , Dunkle Materie
Freie Schlagwörter (englisch): supersymmetry , ATLAS , LHC , dark matter
PACS Klassifikation 14.60.Ef , 14.60.Fg , 12.60.Jv , 11.30.Pb
Institut: Physikalisches Institut
Fakultät: Fakultät für Mathematik und Physik
DDC-Sachgruppe: Physik
Dokumentart: Dissertation
Erstgutachter: Herten, Gregor (Prof. Dr.)
Sprache: Englisch
Tag der mündlichen Prüfung: 06.07.2011
Erstellungsjahr: 2011
Publikationsdatum: 14.07.2011
Bemerkung: A large part of the results have been previously published in the following articles: 1. The ATLAS Collaboration, Expected Performance of the ATLAS Experiment - Detector, Trigger and Physics, arXiv:0901.0512 [hep-ex]. 2. The ATLAS Collaboration, Early supersymmetry searches with jets, missing transverse momentum and one or more leptons with the ATLAS Detector, Tech. Rep. ATLAS-CONF-2010-066, CERN, Geneva, Jul., 2010. 3. The ATLAS Collaboration, Search for Supersymmetry Using Final States with One Lepton, Jets, and Missing Transverse Momentum with the ATLAS Detector in sqrt(s) = 7 TeV pp Collisions, Phys. Rev. Lett. 106 (2011) no. 13, 131802. 4. S. Caron, G. Cowan, E. Gross, S. Horner, and J. E. Sundermann, Absorbing systematic effects to obtain a better background model in a search for new physics, Journal of Instrumentation 4 (2009) no. 10, P10009. http://stacks.iop.org/1748-0221/4/i=10/a=P10009