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Measurement of the ttbar Production Cross Section at sqrt(s)=1.96 TeV in the Muon+Jets Final State using a Topological Method on 363/pb of PASS2 data
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics.
Manuscript (Other academic)
URN: urn:nbn:se:uu:diva-93816OAI: oai:DiVA.org:uu-93816DiVA: diva2:167412
Available from: 2005-11-23 Created: 2005-11-23 Last updated: 2010-01-13Bibliographically approved
In thesis
1. Top-Quark and Charged Higgs Boson Production at Hadron Colliders: Data Analysis at the DØ Experiment and Simulations for the ATLAS Detector
Open this publication in new window or tab >>Top-Quark and Charged Higgs Boson Production at Hadron Colliders: Data Analysis at the DØ Experiment and Simulations for the ATLAS Detector
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis treats two different projects, both aiming at experimental tests at hadron colliders of some specific predictions of the Standard Model (SM) of particle physics and of its Minimal Supersymmetric extension (MSSM). The thesis is based on four papers.

Papers I-III study the discovery potential for a heavy charged Higgs boson of the ATLAS experiment at the Large Hadron Collider (LHC). Charged Higgs bosons are part of the Higgs sector in many extensions to the SM and their detection would be an unambiguous sign of new physics.

If the charged Higgs boson is heavier than the top quark, its dominant decay mode is into a top and a bottom quark. Searches in this decay channel at ATLAS are difficult mainly due to the large top-quark pair-production background. The possible gain obtained when requiring 4 b-tagged jets for the signal events is studied, but no significant improvement compared to an analysis requiring 3 b-tagged jets is found.

If the masses of supersymmetric particles are sufficiently small, heavy charged Higgs bosons can decay into a chargino-neutralino pair. We show that in this decay channel charged Higgs bosons can be detected, given a favourable choice of parameters governing the MSSM.

In a large-mass-splitting MSSM scenario, the charged Higgs decay into a W boson and a neutral Higgs can have a large branching fraction. We conclude, however, that charged Higgs searches in this decay channel are made difficult by a large, irreducible SM background.

Paper IV describes a measurement of the top-quark pair production cross-section performed with the DØ detector at the Tevatron collider. Signal events in the muon+jets decay channel are selected using topological event characteristics and a preliminary result of σ(ttbar)=3.8 +1.1-1.1(stat) +0.9-0.8(syst) +0.3-0.2(lumi) pb is obtained using an integrated luminosity of 363/pb.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2005. v + 67 p.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 126
Elementary particle physics, ATLAS, LHC, charged Higgs boson, MSSM, D0, Tevatron, top quark, elementary particle physics, Elementarpartikelfysik
National Category
Subatomic Physics
urn:nbn:se:uu:diva-6174 (URN)91-554-6413-0 (ISBN)
Public defence
2005-12-16, Polhemsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:15
Available from: 2005-11-23 Created: 2005-11-23Bibliographically approved

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