title: Identification of Higgs to bbbar decays in  boosted topologies and searches for  resonances with boosted b-quark pairs  in their final state with the ATLAS  detector
creator: Sahinsoy, Merve
subject: ddc-530
subject: 530 Physics
description: With the discovery of the 125 GeV Higgs boson, both the measurements of  Higgs properties and the searches for new physics with Higgs bosons moved  into focus of the physics programme of high energy experiments. The most  frequent decay channel of the Higgs boson, the Higgs to bb process, is one of  the natural choices to search for anomalous Higgs production. Focusing on  this decay channel in boosted topologies, this thesis discusses the improved  identification techniques for Higgs boson, and presents two searches using  those techniques. The first analysis searches for pair-production of boosted  Higgs bosons in the bbbb final state with 36.1 ifb of ATLAS pp data collected  in 2015 and 2016 at 13 TeV. The analysis looks for resonances in the  invariant mass region of Higgs pairs between 800 GeV and 3000 GeV. The  second analysis searches for boosted bbbar pairs produced in association with an  additional initial state radiation jet using 80.5 ifb of ATLAS pp data collected  in 2015, 2016 and 2017 at 13 TeV. Targeting the dijet invariant mass  spectrum below 230 GeV, the analysis searches for new resonances predicted  by simplified dark matter models as well as Standard Model boosted Higgs  boson production. No indication of new physics observed in both analyses,  and the results are used to constrain the phase space for beyond the Standard  Model physics.
date: 2019
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/26474/1/MerveRocks.pdf
identifier: DOI:10.11588/heidok.00026474
identifier: urn:nbn:de:bsz:16-heidok-264746
identifier:   Sahinsoy, Merve  (2019) Identification of Higgs to bbbar decays in boosted topologies and searches for resonances with boosted b-quark pairs in their final state with the ATLAS detector.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/26474/
rights: info:eu-repo/semantics/openAccess
rights: http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html
language: eng