Search For New Physics In Mono Jet Final States In Pp Collisions
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Search for New Physics in Mono-jet Final States in pp Collisions by Giuliano Gustavino Pdf
This thesis provides a detailed and comprehensive description of the search for New Physics at the Large Hadron Collider (LHC) in the mono-jet final state, using the first 3.2 fb-1 of data collected at the centre of mass energy of colliding protons of 13~TeV recorded in the ATLAS experiment at LHC. The results are interpreted as limits in different theoretical contexts such as compressed supersymmetric models, theories that foresee extra-spatial dimensions and in the dark matter scenario. In the latter the limits are then compared with those obtained by other ATLAS analyses and by experiments based on completely different experimental techniques, highlighting the role of the mono-jet results in the context of dark matter searches.Lastly, a set of possible analysis improvements are proposed to reduce the main uncertainties that affect the signal region and to increase the discovery potential by further exploiting the information on the final state.
New Results and Actual Problems in Particle & Astroparticle Physics and Cosmology by R Ryutin,V Petrov,V Kiselev Pdf
This unique volume contains the materials of the XXIXth International Workshop on High Energy Physics. The content of the volume is much wider than just high-energy physics and actually concerns all the most fundamental areas of modern physics research: high-energy physics proper, gravitation and cosmology. Presentations embrace both theory and experiment. Contents:12 Closed Doors and 8 Open Windows in Physics Beyond the SM (F Riva)On Possible Interpretation of the LHC Higgs-Like State in the Framework of the Non-Perturbative Effective Interaction of W-Bosons (B A Arbuzov)What Can the Higgs Tell Us About UV Physics? (A K Knochel)Recent Results from the Heavy Ion Program at RHIC (O Evdokimov)Top Quark Physics Results from LHC (C Ferro)Neutrino Oscillations: Recent Results and Perspectives (M M Khabibullin and Yu G Kudenko)High-Energy Collisions in Space-Time Perspective (V A Petrov)Inward Horizons of the Spinning Nucleons (A Prokudin)Supermassive Black Hole at the Galactic Center (A F Zakharov)Einsteinian Revolution's Misinterpretation: No True Black Holes, No Information Paradox: Just Quasi-Static Balls of Quark Gluon Plasma (A Mitra)Flaws in Black Hole Theory and General Relativity (S J Crothers)and other papers Readership: Advanced undergraduates and graduate students, and physicists working in the field of high energy physics. Keywords:Higgs Boson;Quark Gluon Plasma;Neutrino in Labs and Cosmos;Cosmology;Dark Matter
Searching for Dark Matter with the ATLAS Detector by Steven Schramm Pdf
This thesis describes the search for Dark Matter at the LHC in the mono-jet plus missing transverse momentum final state, using the full dataset recorded in 2012 by the ATLAS Experiment. It is the first time that the number of jets is not explicitly restricted to one or two, thus increasing the sensitivity to new signals. Instead, a balance between the most energetic jet and the missing transverse momentum is required, thus selecting mono-jet-like final states. Collider searches for Dark Matter have typically used signal models employing effective field theories (EFTs), even when comparing to results from direct and indirect detection experiments, where the difference in energy scale renders many such comparisons invalid. The thesis features the first robust and comprehensive treatment of the validity of EFTs in collider searches, and provides a means by which the different classifications of Dark Matter experiments can be compared on a sound and fair basis.
Higgs, Supersymmetry and Dark Matter After Run I of the LHC by Béranger Dumont Pdf
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.
Search for Dark Matter with ATLAS by Ruth Pöttgen Pdf
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.
Search for Dark Matter with the ATLAS Detector by Johanna Gramling Pdf
This book discusses searches for Dark Matter at the CERN’s LHC, the world’s most powerful accelerator. It introduces the relevant theoretical framework and includes an in-depth discussion of the Effective Field Theory approach to Dark Matter production and its validity, as well as an overview of the formalism of Simplified Dark Matter models. Despite overwhelming astrophysical evidence for Dark Matter and numerous experimental efforts to detect it, the nature of Dark Matter still remains a mystery and has become one of the hottest research topics in fundamental physics. Two searches for Dark Matter are presented, performed on data collected with the ATLAS experiment. They analyze missing-energy final states with a jet or with top quarks. The analyses are explained in detail, and the outcomes and their interpretations are discussed, also in view of the precedent analysis of theoretical approaches. Given its depth of coverage, the book represents an excellent reference guide for all physicists interested in understanding the theoretical and experimental considerations relevant to Dark Matter searches at the LHC.
Electroweak Physics at the LHC by Matthias U. Mozer Pdf
The book discusses the recent experimental results obtained at the LHC that involve electroweak bosons. The results are placed into an appropriate theoretical and historical context. The work pays special attention to the rising subject of hadronically decaying bosons with high boosts, documenting the state-of-the-art identification techniques and highlighting typical results. The text is not limited to electroweak physics in the strict sense, but also discusses the use of electroweak vector-bosons as tool in the study of other subjects in particle physics, such as determinations of the proton structure or the search for new exotic particles. The book is particularly well suited for graduate students, starting their thesis work on topics that involve electroweak bosons, as the book provides a comprehensive description of phenomena observable at current accelerators as well as a summary of the most relevant experimental techniques.
Search for Exotic Mono-jet Events by Valerio Rossetti Pdf
This thesis describes in detail the search for new phenomena in mono-jet final states with the ATLAS experiment at the LHC. The final state is considered the golden channel in the searches for large extra dimensions (LED) but also allows access to a very rich SUSY-related phenomenology pertaining to the production of weakly interacting massive particles (WIMPS), SUSY Dark Matter candidates, GMSB SUSY models with very light gravitino masses, as well as stop an sbottom pair production in compressed scenarios (with nearly degenerated squarks and the lightest neutralino), and also invisible Higgs searches, among others. Here, a number of these scenarios are explored. The measurements presented yield new powerful constraints on the existence of extra spatial dimensions, the pair production of WIMPs, and also provide the best limit to date on the gravitino mass.
Particle Physics at the Tercentenary of Mikhail Lomonosov by Moskovskiĭ gosudarstvennyĭ universitet im. M.V. Lomonosova Pdf
This volume is devoted to a wide variety of investigations, both in theory and experiment, of particle physics such as electroweak theory, fundamental symmetries, tests of the Standard Model and beyond, neutrino and astroparticle physics, heavy quark physics, non-perturbative QCD, quantum gravity effects, and present and future accelerator physics.
Particle Physics At The Tercentenary Of Mikhail Lomonosov - Proceeding Of The Fifteenth Lomonosov Conference On Elementary Particle Physics by Alexander I Studenikin Pdf
This volume is devoted to a wide variety of investigations, both in theory and experiment, of particle physics such as electroweak theory, fundamental symmetries, tests of the Standard Model and beyond, neutrino and astroparticle physics, heavy quark physics, non-perturbative QCD, quantum gravity effects, and present and future accelerator physics.
LHC Phenomenology by Einan Gardi,Nigel Glover,Aidan Robson Pdf
This book covers a very broad spectrum of experimental and theoretical activity in particle physics, from the searches for the Higgs boson and physics beyond the Standard Model, to detailed studies of Quantum Chromodynamics, the B-physics sectors and the properties of hadronic matter at high energy density as realised in heavy-ion collisions. Starting with a basic introduction to the Standard Model and its most likely extensions, the opening section of the book presents an overview of the theoretical and phenomenological framework of hadron collisions and current theoretical models of frontier physics. In part II, discussion of the theory is supplemented by chapters on the detector capabilities and search strategies, as well as an overview of the main detector components, the initial calibration procedures and physics samples and early LHC results. Part III completes the volume with a description of the physics behind Monte Carlo event generators and a broad introduction to the main statistical methods used in high energy physics. LHC Phenomenology covers all of these topics at a pedagogical level, with the aim of providing young particle physicists with the basic tools required for future work on the various LHC experiments. It will also serve as a useful reference text for those working in the field.
Charming New Physics in Beautiful Processes? by Matthew John Kirk Pdf
This PhD thesis is dedicated to a subfield of elementary particle physics called “Flavour Physics”. The Standard Model of Particle Physics (SM) has been confirmed by thousands of experimental measurements with a high precision. But the SM leaves important questions open, like what is the nature of dark matter or what is the origin of the matter-antimatter asymmetry in the Universe. By comparing high precision Standard Model calculations with extremely precise measurements, one can find the first glimpses of the physics beyond the SM – currently we see the first hints of a potential breakdown of the SM in flavour observables. This can then be compared with purely theoretical considerations about new physics models, known as model building. Both precision calculations and model building are extremely specialised fields and this outstanding thesis contributes significantly to both topics within the field of Flavour Physics and sheds new light on the observed anomalies.
Advances in Jet Substructure at the LHC by Roman Kogler Pdf
This book introduces the reader to the field of jet substructure, starting from the basic considerations for capturing decays of boosted particles in individual jets, to explaining state-of-the-art techniques. Jet substructure methods have become ubiquitous in data analyses at the LHC, with diverse applications stemming from the abundance of jets in proton-proton collisions, the presence of pileup and multiple interactions, and the need to reconstruct and identify decays of highly-Lorentz boosted particles. The last decade has seen a vast increase in our knowledge of all aspects of the field, with a proliferation of new jet substructure algorithms, calculations and measurements which are presented in this book. Recent developments and algorithms are described and put into the larger experimental context. Their usefulness and application are shown in many demonstrative examples and the phenomenological and experimental effects influencing their performance are discussed. A comprehensive overview is given of measurements and searches for new phenomena performed by the ATLAS and CMS Collaborations. This book shows the impressive versatility of jet substructure methods at the LHC.
Search Strategies for New Physics at the LHC by Daniele Spier Moreira Alves Pdf
The LHC is in the frontline of experimental searches for New Physics beyond the Standard Model of Particle Physics. Its power is accompanied by no smaller challenges in analyzing and interpreting its results. In this thesis I explore ways to parameterize new physics phenomena, design search strategies that are sensitive to them, and interpret experimental results in general new physics contexts. In particular, I discuss interpretations of the first ATLAS analysis for supersymmetry with 70/nb of integrated luminosity. I also carry a careful investigation of comprehensive search strategies for new physics with jets and missing energy signatures, and estimate the sensitivity bounds of the 7 TeV LHC to new colored particles decaying to jets and and a neutral particle that escapes detection. Finally, I discuss the implications of the recent LHC excesses hinting to a Higgs boson with mass in the range 142-147 GeV. If confirmed, this range for the Higgs mass will be an important evidence for Split Supersymmetry. I work out the phenomenological predictions of this scenario that will be tested in the very near future by a variety of experiments, including direct and indirect dark matter detection, EDM experiments searching for CP violation and the 7 TeV run of the LHC.
Particle and Astroparticle Physics, Gravitation and Cosmology: Predictions, Observations and New Projects by Vladimir Alexeevich Petrov,Roman Anatolievich Ryutin Pdf
This unique volume captures the content of the XXXth International Workshop on High Energy Physics. The scope of this volume is much wider than just high-energy physics; it actually concerns and includes materials from all the most fundamental areas of modern physics research: high-energy physics proper, gravitation and cosmology. Presentations embrace both theory and experiment. Contents:Search for the Higgs Boson at LEP and at LHC (Dezső Horváth)Standard Model Physics Results from ATLAS and CMS (Milos Dordevic)Top Quark Physics in ATLAS (Carolina Gabaldon)Panel Discussion I: Higgs Boson and Related Topics (Dmitri Kazakov, Dezso Horvath, Lydia Roos, Milos Dordevic, Yury Kolomensky and Maxim Titov)SUSY Searches at CMS (Pedrame Bargassa)Exotica Searches (Daniel Teyssier)SUSY and Exotica Searches in ATLAS (R Stamen)Rare Decays at the LHCb Experiment (L Pescatore)Electroweak Processes in Laser-Boosted Lepton Collisions (S J Müller, C H Keitel and C Müller)Backgrounds and Calorimetry at Future Linear e+e- Colliders (O Markin)Status of Fast Interaction Trigger for ALICE Upgrade (T L Karavicheva, A B Kurepin and W H Trzaska)TOTEM Results on Elastic Scattering and Total Cross-Section (Jan Kašpar)Diffractive Physics with ATLAS (A Sidoti)Diffraction Physics with ALICE at the LHC (Sergey Evdokimov)Low x and Diffraction at HERA (Alice Valkárová)Vector Meson Production in Ultra-Peripheral Collisions at the LHC (L Jenkovszky, A Salii and V Libov)The Interaction Region of High Energy Protons (I M Dremin)Panel Discussion II: Diffraction (Vladimir Petrov, Johan Blouw, Igor Dremin, Jan Kaspar, Antonio Sidoti and Alice Valkarova)QCD Results from ATLAS and CMS (M Leyton)Perturbative QCD at HERA (L K Gladilin)Probing the QCD Phase Boundary with Fluctuations of Conserved Charges (Kenji Morita)Exotic Hadron States (Wei Chen, J Ho, T G Steele, R T Kleiv, B Bulthuis, D Harnett, T Richards and Shi-Lin Zhu)Recent Results of the BES-III Experiment (Yury Nefedov)Baryon Spectroscopy from the Analysis of the Meson Photoproduction Data (A V Sarantsev)Panel Discussion III: Heavy Quarks and Hadron Spectroscopy (Yury Khokhlov, Wei Chen, Andrey Sarantsev, Anatoly Likhoded, Yury Nefedov and Yury Kolomensky)How Far Can a Pragmatist Go into Quantum Theory? A Critical View of Our Current Understanding of Quantum Phenomena (A S Sanz)Half a Century with QUARKS (A Superficial Review) (V A Petrov)Direct Photon and Neutral Pion Production in pp and Pb–Pb Collisions Measured with the ALICE Experiment at LHC (D Peressounko)Strongly Interacting Matter at RHIC: Experimental Highlights (V A Okorokov)Suppression of high pT Hadrons at Midrapidity in Central Heavy Ion Collisions from PHENIX (V Bumazhnov)Origin of Temperature of Quark-Gluon Plasma in Heavy Ion Collisions (Xiao-Ming Xu)Panel Discussion IV: Phenomena in Heavy Ion Collisions (Serguei Sadovsky, Johan Blouw, Vitaly Okorokov, Vladimir Bumazhnov, Xiao-Ming Xu and Dmitri Peresunko)CP Violation Measurements at the LHCb Experiment (L Pescatore)Physics at Belle Experiment (M M Shapkin)Nonzero θ13 and CP Violation from Broken μ – τ Symmetry with m1 = 0 (Asan Damanik)The Hyper-Kamiokande Project (Akira Konaka)Supernova Detection at Super-Kamiokande (M Ikeda)Recent Results of OPERA: Search for νμ → ντ Oscillations (T Omura)Search for νμ → νe Oscillations with the OPERA Experiment (S G Zemskova)Search for Heavy Neutrino in the K+ → μ+νH Decay (A T Shaikhiev)NOνA Neutrino Experiment (Filip Jediny)The Flavor Ratio of the TeV-PeV Neutrinos in IceCube (Sergio Palomares-Ruiz)Panel Discussion V: Neutrino Physics (Vladimir Obraztsov, Akira Konaka, Motoyasu Ikeda, Filip Jediny, Evgeny Shirokov, Oleg Kalekin and Sergio Palomares-Ruiz)The Pierre Auger Observatory: Latest Results and Future Prospects (F Arqueros)Measurement of the Muon Content of EAS with the Pierre Auger Observatory (J C Espadanal)Cosmic-Ray Research with AMS-02 on the International Space Station (H Gast)Panel Discussion VI: Cosmic Rays (Alexander Kisselev, Fernando Arqueros, Henning Gast and Vladimir Solovov)Paradoxes of the Cosmological Physics in the Beginning of the 21-st Century (Yu V Baryshev)On the Average Thermal Evolution of the Universe (Natacha Leite and Alex H Blin)Strong Thermal Leptogenesis: An Exploded View of the Low Energy Neutrino Parameters in the SO(10)-Inspired Model (Luca Marzola)Gravidynamics (Scalar-Tensor Gravitation) and the Observed Discrete Mass Spectrum of Compact Stellar Remnants in Close Binary Systems (V V Sokolov)Cosmological Consequences of the Relativistic Theory of Gravitation (Yu V Chugreev and K A Modestov)B-Mode in CMB Polarization. What's That and Why It is Interesting (A D Dolgov)Panel Discussion VII: Cosmology (Valery Kiselev, Yuri Baryshev, Alex H Blin, Luca Marzola, Alexander Dolgov and Vladimir Sokolov) Readership: Advanced undergraduates and graduate students, and physicists working in the field of high energy physics. Keywords:Higgs Boson;Quark–Gluon Plasma;Neutrino in Labs and the Cosmos;Cosmology;Dark Matter;Heavy Quarks;Hadron Spectroscopy;Cosmic Rays
