title: Search for Resonances Decaying into Top Quark Pairs Using Fully Hadronic Decays in pp Collisions with ATLAS at sqrt(s) = 7 TeV  
creator: Kasieczka, Gregor
subject: ddc-530
subject: 530 Physics
description: A search for new particles that decay into top-quark pairs producing two massive jets with high transverse momentum is presented. Data collected with the ATLAS detector at the Large Hadron Collider during the proton-proton collision run at sqrt(s) = 7 TeV in 2011 is analysed.      The substructure-based HEPTopTagger technique is used to separate top-quark jets from those arising from light quarks or gluons. The performance of this method is evaluated using a statistically independent sample. Top-quark candidates are also required to have a bottom-quark decay associated with them. The backgrounds are estimated using data-driven techniques.      No significant deviation between data and the sum of Standard Model background processes, such as ttbar production and multijet production, is observed in the di-top invariant mass spectrum. Therefore limits on the production cross section times branching fractions of certain models of Z' boson and a Kaluza-Klein gluon resonances are set. The production of Z' bosons with masses between 0.70 and 1.00 TeV as well as 1.28 and 1.32 TeV and Kaluza-Klein gluons with masses between 0.70 and 1.48 TeV is excluded at 95% C.L.  
date: 2013
type: Dissertation
type: info:eu-repo/semantics/doctoralThesis
type: NonPeerReviewed
format: application/pdf
identifier: https://archiv.ub.uni-heidelberg.de/volltextserverhttps://archiv.ub.uni-heidelberg.de/volltextserver/14941/1/Thesis.pdf
identifier: DOI:10.11588/heidok.00014941
identifier: urn:nbn:de:bsz:16-heidok-149417
identifier:   Kasieczka, Gregor  (2013) Search for Resonances Decaying into Top Quark Pairs Using Fully Hadronic Decays in pp Collisions with ATLAS at sqrt(s) = 7 TeV.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/14941/
rights: info:eu-repo/semantics/openAccess
rights: http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html
language: eng