CERN Accelerating science

ATLAS Theses

Measuring the mass of the Higgs boson in the four-lepton final state with the ATLAS detector / Herde, Hannah Elizabeth
We measure the mass of the Standard Model-like Higgs boson in the four-lepton decay channel using 140 fb$^{−1}$ of proton-proton collisions at the Large Hadron Collider at $\sqrt{s}$=13 TeV collected by the ATLAS detector [...]
CERN-THESIS-2020-419 - Waltham, MA : Brandeis University ProQuest Dissertations Publishing, 2020-08-31. - 192 p.

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The Influence of Varying Pulse Shapes on the Energy Reconstruction of ATLAS Liquid Argon Calorimeter Signals using Convolutional Neural Networks / Gutsche, Christian
From 2026 to 2028 the large particle accelerator LHC at CERN will get an upgrade [...]
CERN-THESIS-2022-216 - 105 p.

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The first differential cross section measurements of $t\bar{t}$ produced with a $W$ boson in pp collisions / Bullard, Brendon
Measurements of inclusive $\ttW^\pm$ production cross sections performed by the ATLAS and CMS collaborations have consistently shown excesses of 20\%-70\% over theoretical predictions [...]
CERN-THESIS-2022-215 - 238 p.

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Collective Phenomenon in Photonuclear and Other Small Collision Systems / Seidlitz, Blair Daniel
In the ultrarelativistic collisions of heavy nuclei at the Large Hadron Collider, a large amount of energy and nuclear matter is deposited at the collision point [...]
CERN-THESIS-2022-214 - 282 p.

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Machine learning based searches for new physics at the ATLAS experiment / Noel, Daniel
A primary goal of the ATLAS experiment at the LHC is to discover new physics [...]
CERN-THESIS-2022-213 -

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Calibrated Probes of Jet-Medium Interactions in Hot and Cold Nuclear Matter / Ouellette, Jeff
Ultrarelativistic collisions of large nuclei are understood to produce droplets of quark-gluon plasma (QGP), a deconfined phase of QCD matter that exists at high temperatures $\gtrsim 155$ MeV [...]
CERN-THESIS-2022-212 - 446 p.

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A Novel Search for Exotic Decays of the Higgs Boson with the ATLAS Detector and Enhancing the Physics Potential of the Large Hadron Collider and Atom Interferometers with New Techniques / Safdari, Murtaza
Fundamental physics research aims to understand the theory of particle interactions, the Standard Model (SM) of particle physics being the current best theory of the electroweak and strong forces [...]
CERN-THESIS-2022-211 -

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Measurement of gauge boson joint-polarisation states in WZ pair production at the LHC with the ATLAS detector / Selem, Luka
Within the Standard Model of particle physics, the electroweak spontaneous symmetry breaking mechanism is responsible for the appearance of a longitudinal polarisation state in the massive $W$± and $Z$ vector bosons [...]
CERN-THESIS-2022-210 - 200 p.

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Identification of boosted Higgs bosons for new physics searches and improvement of the ATLAS tracker for the high luminosity phase of LHC / He, Yajun
This thesis covers the main contributions of the author during the PhD program: the in-situ calibration of the $X \rightarrow b\bar{b}$ tagger using $Z$+jets events, the measurement of the $V(\rightarrow qq')H(\rightarrow b)\bar{b}$ production at high transverse momentum and the characterisation of [...]
CERN-THESIS-2022-207 - 214 p.

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Search for low-mass resonances in four-muon final state and generic heavy Higgs bosons in same-sign two-lepton final state with the ATLAS detector / Xu, Yue
LHCb announced the discovery of new di-$J/\psi$ resonances around $6.9$ GeV in 2020, which can be seen as a $cc\bar{c}\bar{c}$ tetraquark [...]
CERN-THESIS-2022-206 - 195 p.

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