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| Author | : Michael A. Balazs |
| Publisher | : |
| Total Pages | : 200 |
| Release | : 2011 |
| Genre | : |
| ISBN | : |
| Author | : Philippe Giguère |
| Publisher | : |
| Total Pages | : |
| Release | : 2014 |
| Genre | : |
| ISBN | : |
"With the experiments at the Large Hadron Collider, physicists are in a better position than ever to test the Standard Model of particle physics and what might lie beyond it. In this thesis, we investigate one possibility of physics beyond the Standard Model: supersymmetry. We discuss phenomenological aspects of the theory and describe a series of software that allows us to look for signs of supersymmetry in particle physics experiments. Using this framework, we do a sample analysis in the $m_0$-$m_{1/2}$ plane of the CMSSM, producing a combined likelihood exclusion band based on results of the ATLAS experiment from $35 \> \text{pb} {-1}$ of $7$ TeV proton-proton collisions." --
| Author | : Marco Valente |
| Publisher | : Springer Nature |
| Total Pages | : 231 |
| Release | : 2022-03-05 |
| Genre | : Science |
| ISBN | : 3030940470 |
After an extensive overview of the Standard Model and of the theory and phenomenology of Supersymmetry, this book describes the recent development of the ATLAS Particle Flow algorithm, a hadronic reconstruction technique aiming at enhancing the sensitivity of the experiment to new physics through the combination of the information from different ATLAS sub-detectors. The first ever ATLAS strong SUSY search exploiting this technique is also described, reporting the results and exclusion limits obtained using the complete proton-proton collision dataset recorded by the ATLAS experiment during the second Run of the Large Hadron Collider (LHC).
| Author | : Giordon Stark |
| Publisher | : Springer Nature |
| Total Pages | : 263 |
| Release | : 2020-03-13 |
| Genre | : Science |
| ISBN | : 3030345483 |
This thesis represents one of the most comprehensive and in-depth studies of the use of Lorentz-boosted hadronic final state systems in the search for signals of Supersymmetry conducted to date at the Large Hadron Collider. A thorough assessment is performed of the observables that provide enhanced sensitivity to new physics signals otherwise hidden under an enormous background of top quark pairs produced by Standard Model processes. This is complemented by an ingenious analysis optimization procedure that allowed for extending the reach of this analysis by hundreds of GeV in mass of these hypothetical new particles. Lastly, the combination of both deep, thoughtful physics analysis with the development of high-speed electronics for identifying and selecting these same objects is not only unique, but also revolutionary. The Global Feature Extraction system that the author played a critical role in bringing to fruition represents the first dedicated hardware device for selecting these Lorentz-boosted hadronic systems in real-time using state-of-the-art processing chips and embedded systems.
| Author | : Shaaban Khalil |
| Publisher | : CRC Press |
| Total Pages | : 394 |
| Release | : 2017-12-06 |
| Genre | : Science |
| ISBN | : 1315350874 |
Supersymmetry (SUSY) is one of the most important ideas ever conceived in particle physics. It is a symmetry that relates known elementary particles of a certain spin to as yet undiscovered particles that differ by half a unit of that spin (known as Superparticles). Supersymmetric models now stand as the most promising candidates for a unified theory beyond the Standard Model (SM). SUSY is an elegant and simple theory, but its existence lacks direct proof. Instead of dismissing supersymmetry altogether, Supersymmetry Beyond Minimality: from Theory to Experiment suggests that SUSY may exist in more complex and subtle manifestation than the minimal model. The book explores in detail non-minimal SUSY models, in a bottom-up approach that interconnects experimental phenomena in the fermionic and bosonic sectors. The book considers with equal emphasis the Higgs and Superparticle sectors, and explains both collider and non-collider experiments. Uniquely, the book explores charge/parity and lepton flavour violation. Supersymmetry Beyond Minimality: from Theory to Experiment provides an introduction to well-motivated examples of such non-minimal SUSY models, including the ingredients for generating neutrino masses and/or relaxing the tension with the heavily constraining Large Hadron Collider (LHC) data. Examples of these scenarios are explored in depth, in particular the discussions on Next-to-Minimal Supersymmetric SM (NMSSM) and B-L Supersymmetric SM (BLSSM).
| Author | : Mats Joakim Robert Olsson |
| Publisher | : |
| Total Pages | : 256 |
| Release | : 2018 |
| Genre | : |
| ISBN | : 9780438756403 |
The Large Hadron Collider (LHC) and its experiments were built to explore fundamental questions of particle physics via proton-proton collisions at unprecedented center-of-mass energies, thus providing a unique environment for testing the Standard Model (SM) at the electroweak scale and searching for signs of new physics beyond the SM (BSM). The discovery of a SM-like 125 GeV Higgs boson by ATLAS and CMS hints of new physics at the electroweak scale-possibly within reach of the LHC-in order to mitigate divergent radiative corrections to the Higgs squared mass. This can systematically be accomplished by the introduction of supersymmetry (SUSY). For the experimentalist, SUSY provides a set of simplified benchmark models, with explicit and testable predictions, which are useful when searching for BSM physics. A large number of BSM searches has been carried out at the LHC. However, no evidence for SUSY has been found. It is therefore important to expand the scope. This thesis presents two ATLAS analyses for SUSY, both utilizing fully hadronic final states. The first analysis searches for the pair production of top squarks (stops), each with R-parity-violating decays into a b- and an s-quark. This analysis was performed using proton-proton collision data with an integrated luminosity of 17.4 fb-1 at a center-of-mass energy of 8 TeV. The second analysis searches for electroweak production of a chargino-neutralino pair, decaying into SM-quarks via a W boson and a SM-like 125 GeV Higgs boson, performed using an integrated luminosity of 36.1 fb-1 at a center-of-mass energy of 13 TeV. No evidence of an excess beyond the SM background prediction is observed in either search, thus exclusion limits are set at 95% CL. Stops decaying directly to hadronic final states are excluded for masses in the range 100 to 315 GeV. Charginos and neutralinos decaying via Wh to hadronic final states are excluded up to 680 GeV, by far the strongest limits on electroweak SUSY with Wh decays to date. The tools and strategies developed in the searches for SUSY with hadronic final states in this thesis should prove useful in future searches for BSM physics at the LHC.
| Author | : Mireia Crispín Ortuzar |
| Publisher | : Springer |
| Total Pages | : 194 |
| Release | : 2016-08-25 |
| Genre | : Science |
| ISBN | : 3319434616 |
This book describes research in two different areas of state-of-the-art hadron collider physics, both of which are of central importance in the field of particle physics. The first part of the book focuses on the search for supersymmetric particles called gluinos. The book subsequently presents a set of precision measurements of “multi-jet” collision events, which involve large numbers of newly created particles, and are among the dominant processes at the Large Hadron Collider (LHC). Now that a Higgs boson has been discovered at the LHC, the existence (or non-existence) of supersymmetric particles is of the utmost interest and significance, both theoretically and experimentally. In addition, multi-jet collision events are an important background process for a wide range of analyses, including searches for supersymmetry.
| Author | : Thomas Schörner-Sadenius |
| Publisher | : Springer |
| Total Pages | : 554 |
| Release | : 2015-05-15 |
| Genre | : Science |
| ISBN | : 3319150014 |
This comprehensive volume summarizes and structures the multitude of results obtained at the LHC in its first running period and draws the grand picture of today’s physics at a hadron collider. Topics covered are Standard Model measurements, Higgs and top-quark physics, flavour physics, heavy-ion physics, and searches for supersymmetry and other extensions of the Standard Model. Emphasis is placed on overview and presentation of the lessons learned. Chapters on detectors and the LHC machine and a thorough outlook into the future complement the book. The individual chapters are written by teams of expert authors working at the forefront of LHC research.
| Author | : Yutaro Iiyama |
| Publisher | : Springer |
| Total Pages | : 182 |
| Release | : 2017-06-14 |
| Genre | : Science |
| ISBN | : 3319586610 |
This Ph.D. thesis is a search for physics beyond the standard model (SM) of particle physics, which successfully describes the interactions and properties of all known elementary particles. However, no particle exists in the SM that can account for the dark matter, which makes up about one quarter of the energy-mass content of the universe. Understanding the nature of dark matter is one goal of the CERN Large Hadron Collider (LHC). The extension of the SM with supersymmetry (SUSY) is considered a promising possibilities to explain dark matter. The nominated thesis describes a search for SUSY using data collected by the CMS experiment at the LHC. It utilizes a final state consisting of a photon, a lepton, and a large momentum imbalance probing a class of SUSY models that has not yet been studied extensively. The thesis stands out not only due to its content that is explained with clarity but also because the author performed more or less all aspects of the thesis analysis by himself, from data skimming to limit calculations, which is extremely rare, especially nowadays in the large LHC collaborations.
| Author | : Paul Halpern |
| Publisher | : Turner Publishing Company |
| Total Pages | : 257 |
| Release | : 2009-07-17 |
| Genre | : Science |
| ISBN | : 047048621X |
An accessible look at the hottest topic in physics and the experiments that will transform our understanding of the universe The biggest news in science today is the Large Hadron Collider, the world's largest and most powerful particle-smasher, and the anticipation of finally discovering the Higgs boson particle. But what is the Higgs boson and why is it often referred to as the God Particle? Why are the Higgs and the LHC so important? Getting a handle on the science behind the LHC can be difficult for anyone without an advanced degree in particle physics, but you don't need to go back to school to learn about it. In Collider, award-winning physicist Paul Halpern provides you with the tools you need to understand what the LHC is and what it hopes to discover. Comprehensive, accessible guide to the theory, history, and science behind experimental high-energy physics Explains why particle physics could well be on the verge of some of its greatest breakthroughs, changing what we think we know about quarks, string theory, dark matter, dark energy, and the fundamentals of modern physics Tells you why the theoretical Higgs boson is often referred to as the God particle and how its discovery could change our understanding of the universe Clearly explains why fears that the LHC could create a miniature black hole that could swallow up the Earth amount to a tempest in a very tiny teapot "Best of 2009 Sci-Tech Books (Physics)"-Library Journal "Halpern makes the search for mysterious particles pertinent and exciting by explaining clearly what we don't know about the universe, and offering a hopeful outlook for future research."-Publishers Weekly Includes a new author preface, "The Fate of the Large Hadron Collider and the Future of High-Energy Physics" The world will not come to an end any time soon, but we may learn a lot more about it in the blink of an eye. Read Collider and find out what, when, and how.
