Sökning: "ATLAS experiment"

Visar resultat 11 - 15 av 69 avhandlingar innehållade orden ATLAS experiment.

1. 11. Top-Quark and Charged Higgs Boson Production at Hadron Colliders : Data Analysis at the DØ Experiment and Simulations for the ATLAS Detector

   Författare :Nils Gollub; Tord Ekelöf; Richard Brenner; Patrizia Azzi; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Elementary particle physics; ATLAS; LHC; charged Higgs boson; MSSM; D0; Tevatron; top quark; elementary particle physics; Elementarpartikelfysik; Elementary particle physics; Elementarpartikelfysik;

   Sammanfattning : 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. LÄS MER

3. 12. Hunting the Charged Higgs Boson with Lepton Signatures in the ATLAS Experiment

   Författare :Alexander Madsen; Arnaud Ferrari; Johann Collot; Ellert Mattias; Albert de Roeck; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; charged Higgs boson; ATLAS; LHC; 2HDM; MSSM; particle physics; Fysik med inriktning mot elementarpartikelfysik; Physics with specialization in Elementary Particle Physics;

   Sammanfattning : This thesis presents searches for a charged Higgs boson (H±) in proton-proton collisions with center-of-mass energies of 7 TeV and 8 TeV, using data collected by the ATLAS experiment at the Large Hadron Collider at CERN. Multiple search channels are used with the common characteristic of at least one charged lepton (electron or muon) that effectively reduces the multi-jet background and is used for efficient triggering. LÄS MER

4. 13. Search for Pair-Produced Supersymmetric Top Quark Partners with the ATLAS Experiment

   Författare :Yiming Abulaiti; Sara Strandberg; Kerstin Jon-And; Isabell Melzer-Pellmann; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; ATLAS; supersymmetry; SUSY; Beyond Standard Model; stop; pMSSM; Large Hadron Collider; LHC; CERN; fysik; Physics;

   Sammanfattning : Searches for the supersymmetric partner of the top quark (stop) are motivated by natural supersymmetry, where the stop has to be light to cancel the large radiative corrections to the Higgs boson mass. This thesis presents three different searches for the stop at √s = 8 TeV and √s = 13 TeV using data from the ATLAS experiment at CERN’s Large Hadron Collider. LÄS MER

5. 14. Luminosity determination and searches for supersymmetric sleptons and gauginos at the ATLAS experiment

   Författare :Anders Floderus; Partikel- och kärnfysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Electroweak; SUSY; Supersymmetry; Luminosity; LUCID; LHC; ATLAS; Slepton; Gaugino; Fysicumarkivet A:2014:Floderus;

   Sammanfattning : This thesis documents my work in the luminosity and supersymmetry groups of the ATLAS experiment at the Large Hadron Collider. The theory of supersymmetry and the concept of luminosity are introduced. The ATLAS experiment is described with special focus on a luminosity monitor called LUCID. LÄS MER

7. 15. Searches for dark matter in association with top quarks with the ATLAS experiment

   Författare :Patrawan Pasuwan; Sara Strandberg; Christophe Clément; Steven Lowette; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; LHC; ATLAS; luminosity; track counting; dark matter; BSM; Physics; fysik;

   Sammanfattning : This thesis presents a search for dark matter with the ATLAS experiment using 139 fb−1 of pp collision data at √s = 13 TeV delivered by the LHC from 2015 to 2018. The search targets a simplified model where a spin-0 scalar or pseudoscalar mediator particle, decaying to a pair of dark matter particles, is produced in association with a pair of top quarks. LÄS MER