Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 43 for “"ATLAS Experiment"”.
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Searches for new physics with the ATLAS experiment
… of an analysis of collisions recorded by the ATLAS detector in 2015. No significant deviations from Standard Model predictions were observed. The constraints inferred on the parameters of the model are a significant advance on previous results. Lepton flavour is conserved in the Standard …
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A search for tWZ production at the ATLAS experiment
… proton-proton collision data measured using the ATLAS detector. The search targets the trilepton and tetralepton final states, where regions were defined using physics object multiplicities. Graph neural networks were employed to perform signal-background discrimination. The signal strength of …
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Measurement of the Λb baryon mass in the ATLAS experiment
… v proton-protonových srážkách za použití experimentálních dat z detektoru ATLAS na LHC v CERN. Hmotnost je měřena rekonstrukcí hybností produktů v studovaném rozpadu. Rozpadový kanál Λb → J/ψ(µ+ µ− )Λ(pπ− ) je vybrán pro rekonstrukci hmotnosti v této práci. Byla aplikována výběrové …
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Enhancing the sensitivity of the ATLAS experiment to electroweak supersymmetry
… and their interactions, but is incomplete. The ATLAS experiment at the Large Hadron Collider has performed a suite of searches for new fundamental particles predicted by `beyond-the-Standard Model' theories such as supersymmetry (SUSY). As yet, no discoveries have been made, but a range of …
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Measurement of exclusive Di-Muon production in the ATLAS experiment
… di-muon pairs in proton-protoncollisions at the ATLAS experiment is described.
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New physics searches in the ZZ sector with the ATLAS experiment
… anomalous triple gauge boson couplings in the ATLAS detector at the Large Hadron Collider (LHC). The most general (V ZZ, V = Z, g) vertex is parametrised by four couplings, fV = Z,g i=4,5 , all of which are zero in the Standard Model. Non-zero couplings would manifest themselves as an excess of …
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Machine learning based searches for new physics at the ATLAS experiment
A primary goal of the ATLAS experiment at the LHC is to discover new physics. In recent years, however, such discoveries have been scarce, creating a need for more sophisticated analysis techniques to probe for new physics in more intricate ways. This thesis focuses on two searches for new physics …
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Isolated direct photon production and the Atlantis event display for the ATLAS experiment
… for the first LHC collision data from the ATLAS experiment. Comparisons are made between Monte-Carlo predictions and an optimised method of selecting and reconstructing the events from data taken by the detector is described. Also explained is work carried out on the Atlantis event display. …
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Search for gravitons using merged jets from Z boson decays with the ATLAS experiment
… fb-1 of integrated luminosity collected by the ATLAS experiment from proton-proton collisions at 7 TeV. Events with two charged leptons and either two resolved jets or one merged jet are analyzed and found to be consistent with the Standard Model background expectation. In the absence of an …
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Suppression of the fake lepton background in same-sign W-boson scattering with the ATLAS experiment
… of 5σ or higher using √s = 13 TeV data from the ATLAS detector's Run 2. The two scattered W-bosons decay leptonically leaving a distinctive experimental signature of two same-sign leptons, two forward jets, and missing transverse energy carried away by two neutrinos. Non-prompt leptons are …
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Holly Pacey and the Half-Spin Particles: Searching for new physics with leptons at the ATLAS experiment
… (LHC) has spent just over a decade pushing experimental boundaries in energy and intensity of proton-proton collisions, it has yet to discover new physics beyond the Standard Model. The Standard Model remains one of the most robustly tested theories of all time, despite evidence that it is …
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A search for displaced lepton and track triggers at the ATLAS experiment at the Large Hadron Collider
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-03-28 without embargo terms
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A search for tWZ production in the trilepton channel using Run 2 data from the ATLAS experiment
… centre of mass energy of 13 TeV, recorded by the ATLAS detector between 2016 and 2018. The aim of the analysis was to search for evidence of a top quark produced in association with a W boson and a Z boson (tWZ). An event selection scheme was developed using simulation to broadly suppress …
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Studie zur elektronischen Kalibration der Flüssig-Argon-Kalorimeter und zur Entdeckung unsichtbar zerfallender Higgs-Bosonen im ATLAS-Experiment
Im Jahr 2007 soll am LHC am CERN in Genf das ATLAS-Experiment seinen Betrieb aufnehmen. Derzeit befindet sich der Detektor im Aufbau. Die vorliegende Arbeit untersucht Methoden zur Kalibration der Flüssig-Argon-Kalorimeter des ATLAS-Experiments und zeigt das Potential für die Suche nach unsichtbar …
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Extending the Reach of Searches for Staus, Charginos and Neutralinos with the ATLAS Experiment at the Large Hadron Collider
… using the 139 fb⁻¹ of data collected with the ATLAS experiment at the Large Hadron Collider between 2015 and 2018. Searches for three different production modes of these particles are considered, with new approaches for each that highlight different methods for improving sensitivity. Firstly, a …
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DEVELOPMENT OF HIGH-EFFICIENCY POWER DISTRIBUTION ARCHITECTURES BASED ON GAN DEVICES FOR THE LIQUID ARGON CALORIMETER ATLAS EXPERIMENT AT THE LHC
… environmental footprint. High-energy physics experiment, such as the ATLAS detector in the CERN Large Hadron Collider (LHC) at CERN, also require energy sustainability, spatial limitations, and operation reliability requirements. This thesis is focused on the development and application of a …
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Studies of b-associated production and muonic decays of neutral Higgs bosons at the ATLAS experiment within the Minimal Supersymmetric Standard Model
… Standard Model (MSSM) decaying into muons at the Atlas experiment at the CERN Large Hadron Collider. Signal and background processes are simulated using novel Monte Carlo generators that incorporate parts of higher order corrections and are expected to give a more accurate prediction than previous …
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A Search For Wino Pair Production With B − L R-Parity Violating Chargino Decay To A Trilepton Resonance With The Atlas Experiment
… the Large Hadron Collider (LHC) collected by the ATLAS experiment. The B − L Minimal Supersym- metric Standard Model predicts that these superpartners will have small R-parity violating couplings and the lightest superpartner will therefore decay to Standard Model particles. Two searches are …
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Measurement of J/ψ meson production in association with a W [superscript ±] boson in pp data at 13 TeV collected by the ATLAS experiment
… ±] boson in √s = 13 TeV pp collisions by the ATLAS experiment, using 139 fb⁻¹ of integrated luminosity produced by the Large Hadron Collider at CERN. Events are selected with W [superscript ±] → ℓ [superscript ±] ν and J/ψ → µ⁺µ⁻. The ratio of the prompt J/ψ + W [superscript ±] cross-section …
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Measurement of the leptonic charge asymmetry in ttW± production using the trilepton final state in proton-proton collisions at √ s = 13 TeV using the ATLAS experiment
… at √ s = 13 TeV, which was recorded using the ATLAS experiment and corresponds to an integrated luminosity of 139 . An event selection scheme was put in place to optimally select for t ¯tW± events in the trilepton final state while suppressing background events. The A ` C is calculated using …
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