- Titel
- A Cross Section Measurement Of Events With Two Muons At The $Z^{0}$ Resonance And At Least One Heavy Flavour Jet At The ATLAS Experiment Of The Large Hadron Collider
- Zitierfähige Url:
- https://nbn-resolving.org/urn:nbn:de:bsz:14-qucosa-95532
- Datum der Einreichung
- 16.05.2012
- Datum der Verteidigung
- 16.07.2012
- Abstract (EN)
- In 2010, the Large Hadron Collider (\\lhc{}) at the European Organisation for Nuclear Research (CERN) near Geneva (Switzerland) came into full operation providing proton-proton collisions at a centre-of-mass energy of $\\sqrt{s} = \\unit[7]{TeV}$. \\lhc{} data may allow the observation of the Higgs boson, the last unknown building block of the standard model of particle physics (SM). Di-muon final states containing heavy flavour jets pose an irreducible background for searches of the Higgs boson as predicted the SM or theories beyond. They also provide a unique testbed for tests of perturbative Quantum Chromo-Dynamics (pQCD). This thesis provides a measurement of the cross section of events with one di-muon pair with an invariant mass in the \\Z{} mass region and at least one heavy flavour jet. Studies on acceptance and systematic effects of the experimental setup are presented as well as a comparison to theoretical predictions. The total inclusive cross section of \\zbFS{} events was observed as $\\sigma(\\mu^{+}\\mu^{-}+b+X) = \\unit[(4.15 ^{+0.97}_{-0.89} (stat.) ^{+0.45}_{-0.53} (syst.))]{pb} $ from the equivalent of $\\unit[36]{pb^{-1}}$ of data. Agreement with pQCD predictions at next-to leading order (NLO) is found while tensions with leading order (LO) predictions are observed. Further, the cross-section ratio \\RwZ{} with events containing two muons and at least one jet of any origin was measured to $\\mathcal{R} = \\unit[4.6 ^{+1.4}_{-1.2} (stat.) \\pm 0.5 (syst.)]{\\%}$. This is found to agree with NLO and LO calculations within known uncertainties.
- Freie Schlagwörter (DE)
- LHC, ATLAS, 2010, Z, Boson, Myon, Bottom, Beauty, Quarks,Teilchenphysik
- Freie Schlagwörter (EN)
- LHC, ATLAS, 2010, Z, Boson, Muon, Bottom, Beauty, Quarks, Particle Physics
- Klassifikation (DDC)
- 530
- Klassifikation (RVK)
- UN 6100, UO 5000, UO 6000
- GutachterIn
- Prof. Dr. Michael Kobel
- Prof. Dr. Ulrich Husemann
- BetreuerIn
- Prof. Dr. Michael Kobel
- Den akademischen Grad verleihende / prüfende Institution
- Technische Universität Dresden, Dresden
- URN Qucosa
- urn:nbn:de:bsz:14-qucosa-95532
- Veröffentlichungsdatum Qucosa
- 03.12.2012
- Dokumenttyp
- Dissertation
- Sprache des Dokumentes
- Englisch
- Lizenz / Rechtehinweis
