Search for Dark Matter with ATLAS [electronic resource] : Using Events with a Highly Energetic Jet and Missing Transverse Momentum in Proton-Proton Collisions at √s = 8 TeV    /
Pöttgen, Ruth.author.
This thesis describes in detail a search for weakly interacting massive particles as possible dark matter candidates, making use of so-called mono-jet events. It includes a detailed description of the run-1 system, important operational challenges, and the upgrade for run-2. The nature of dark matter, which accounts for roughly 25% of the energy-matter content of the universe, is one of the biggest open questions in fundamental science. The analysis is based on the full set of proton-proton collisions collected by the ATLAS experiment at the Large Hadron Collider at √s = 8 TeV. Special attention is given to the experimental challenges and analysis techniques, as well as the overall scientific context beyond particle physics. The results complement those of non-collider experiments and yield some of the strongest exclusion bounds on parameters of dark matter models by the end of the Large Hadron Collider run-1. Details of the upgrade of the ATLAS Central Trigger for run-2 are also included.      .
Description based upon print version of record.
Includes bibliographical references at the end of each chapters.
Introduction -- Theory and Motivation -- The Standard Model of Particle Physics -- Dark Matter -- Proton-Proton Collisions -- Mono-Jet Events as Dark Matter Signature at Colliders -- Large Hadron Collider -- The ATLAS Experiment -- Operation of the Central Trigger during run-I -- Upgrade of the Central Trigger -- Analysis Strategy -- Data and Simulated Samples -- Physics Objects Deﬁnitions -- Event Selection -- Background Estimation -- Results and Interpretation -- Prospects with Future LHC Data Conclusion. .
This thesis describes in detail a search for weakly interacting massive particles as possible dark matter candidates, making use of so-called mono-jet events. It includes a detailed description of the run-1 system, important operational challenges, and the upgrade for run-2. The nature of dark matter, which accounts for roughly 25% of the energy-matter content of the universe, is one of the biggest open questions in fundamental science. The analysis is based on the full set of proton-proton collisions collected by the ATLAS experiment at the Large Hadron Collider at √s = 8 TeV. Special attention is given to the experimental challenges and analysis techniques, as well as the overall scientific context beyond particle physics. The results complement those of non-collider experiments and yield some of the strongest exclusion bounds on parameters of dark matter models by the end of the Large Hadron Collider run-1. Details of the upgrade of the ATLAS Central Trigger for run-2 are also included.      .
Elementary particles (Physics).
Quantum field theory.
Cosmology.
Gravitation.
Elementary Particles, Quantum Field Theory.
Cosmology.
Classical and Quantum Gravitation, Relativity Theory.