Hadronic jets play a vital role in the search for physics beyond the Standard Model at particle colliders. Jets are the most commonly produced collision products at hadron colliders like the LHC, and thus represent an extremely promising avenue for discovery. While this prevalence allows for Standard Model processes to be measured to extreme precision and exciting new physics to be searched for, analysis using jets comes with many challenges. The high rate of collision events that produce jets naturally leads to a large background that must be sorted through so that the most interesting events may be identified and recorded. This requires robust jet reconstruction, calibration, and triggering in order to maximize the amount of interesting jet events that can be analyzed for potential new discoveries. In this thesis, an analysis of the performance of the ATLAS jet trigger system during CERN LHC Run 2 is presented. Jet Trigger efficiency curves are analyzed for the full suite of HLT triggers from each year of Run 2 data collection, with differences in run conditions from year to year reviewed and their impacts on jet trigger efficiency analyzed. The effects of an improved jet calibration scheme implemented midway through Run 2 on jet trigger efficiencies and the fraction of recorded fully efficient data that is most useful for further physics analysis are investigated. Additionally, a search for new physics using dijet events at the trigger level is presented. Results of a partial Run 2 analysis using data collected through 2016 are presented and contributions to an upcoming full Run 2 analysis are discussed.

The topics covered in this book include: Aspects of Quantum gravity. Introduction to supersymmetry. Supersymmetric field theories and the gauge covariant field theory of strings. Superspace and supergraphs. Connection between supergravity and strings. Introduction to superstring. Scatter coupling supergravity - general features and new results. Supersymmetry, supergravity and superstring phenomenology. Kaluza klein and superstrings.

The physics of neutrinos--uncharged elementary particles that are key to helping us better understand the nature of our universe--is one of the most exciting frontiers of modern science. This book provides a comprehensive overview of neutrino physics today and explores promising new avenues of inquiry that could lead to future breakthroughs. The Physics of Neutrinos begins with a concise history of the field and a tutorial on the fundamental properties of neutrinos, and goes on to discuss how the three neutrino types interchange identities as they propagate from their sources to detectors. The book shows how studies of neutrinos produced by such phenomena as cosmic rays in the atmosphere and nuclear reactions in the solar interior provide striking evidence that neutrinos have mass, and it traces our astounding progress in deciphering the baffling experimental findings involving neutrinos. The discovery of neutrino mass offers the first indication of a new kind of physics that goes beyond the Standard Model of elementary particles, and this book considers the unanticipated patterns in the masses and mixings of neutrinos in the framework of proposed new theoretical models. The Physics of Neutrinos maps out the ambitious future facilities and experiments that will advance our knowledge of neutrinos, and explains why the way forward in solving the outstanding questions in neutrino science will require the collective efforts of particle physics, nuclear physics, astrophysics, and cosmology.

This work was nominated as an outstanding PhD thesis by the LPSC, Université Grenoble Alpes, France. The LHC Run 1 was a milestone in particle physics, leading to the discovery of the Higgs boson, the last missing piece of the so-called "Standard Model" (SM), and to important constraints on new physics, which challenge popular theories like weak-scale supersymmetry. This thesis provides a detailed account of the legacy of the LHC Run 1 ≤¥regarding these aspects. First, the SM and the need for its extension are presented in a concise yet revealing way. Subsequently, the impact of the LHC Higgs results on scenarios of new physics is assessed in detail, including a careful discussion of the relevant uncertainties. Two approaches are considered: generic modifications of the Higgs couplings, possibly arising from extended Higgs sectors or higher-dimensional operators; and tests of specific new physics models. Lastly, the implications of the null results of the searches for new physics are discussed with a particular focus on supersymmetric dark matter candidates. Here as well, two approaches are presented: the "simplified models" approach, and recasting by event simulation. This thesis stands out for its educational approach, its clear language and the depth of the physics discussion. The methods and tools presented offer readers essential practical tools for future research.

The book begins with a brief review of supersymmetry, and the construction of the minimal supersymmetric standard model and approaches to supersymmetry breaking. General non-perturbative methods are also reviewed leading to the development of holomorphy and the Affleck-Dine-Seiberg superpotential as powerful tools for analysing supersymmetric theories. Seiberg duality is discussed in detail, with many example applications provided, with special attention paid to its use in understanding dynamical supersysmmetry breaking. The Seiberg-Witten theory of monopoles is introduced through the analysis of simpler N=1 analogues. Superconformal field theories are described along with the most recent development known as "amaximization". Supergravity theories are examined in 4, 10, and 11 dimensions, allowing for a discussion of anomaly and gaugino mediation, and setting the stage for the anti- de Sitter/conformal field theory correspondence. This book is unique in containing an overview of the important developments in supersymmetry since the publication of "Suppersymmetry and Supergravity" by Wess and Bagger. It also strives to cover topics that are of interest to both formal and phenomenological theorists.