Searching For Dark Matter With The Atlas Detector

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Searching for Dark Matter with the ATLAS Detector

Steven Schramm
Searching for Dark Matter with the ATLAS Detector Book PDF

Author : Steven Schramm
Publisher : Springer
Page : 324 pages
File Size : 43,6 Mb
Release : 2016-11-23
Category : Science
ISBN : 9783319444536

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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.

Search for Dark Matter with the ATLAS Detector

Johanna Gramling
Search for Dark Matter with the ATLAS Detector Book PDF

Author : Johanna Gramling
Publisher : Springer
Page : 282 pages
File Size : 50,5 Mb
Release : 2018-08-01
Category : Science
ISBN : 9783319950167

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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.

Search for Dark Matter with ATLAS

Ruth Pöttgen
Search for Dark Matter with ATLAS Book PDF

Author : Ruth Pöttgen
Publisher : Springer
Page : 325 pages
File Size : 48,5 Mb
Release : 2016-06-29
Category : Science
ISBN : 9783319410456

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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 Produced in Association with a Higgs Boson Decaying to Two Bottom Quarks at ATLAS

Yangyang Cheng
Search for Dark Matter Produced in Association with a Higgs Boson Decaying to Two Bottom Quarks at ATLAS Book PDF

Author : Yangyang Cheng
Publisher : Springer
Page : 176 pages
File Size : 46,5 Mb
Release : 2016-09-29
Category : Science
ISBN : 9783319442181

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Search for Dark Matter Produced in Association with a Higgs Boson Decaying to Two Bottom Quarks at ATLAS by Yangyang Cheng Pdf

This thesis reports on the search for dark matter in data taken with the ATLAS detector at CERN’s Large Hadron Collider (LHC). The identification of dark matter and the determination of its properties are among the highest priorities in elementary particle physics and cosmology. The most likely candidate, a weakly interacting massive particle, could be produced in the high energy proton-proton collisions at the LHC. The analysis presented here is unique in looking for dark matter produced together with a Higgs boson that decays into its dominant decay mode, a pair of b quarks. If dark matter were seen in this mode, we would learn directly about the production mechanism because of the presence of the Higgs boson. This thesis develops the search technique and presents the most stringent production limit to date.

Searches for the Supersymmetric Partner of the Top Quark, Dark Matter and Dark Energy at the ATLAS Experiment

Nicolas Maximilian Köhler
Searches for the Supersymmetric Partner of the Top Quark Dark Matter and Dark Energy at the ATLAS Experiment Book PDF

Author : Nicolas Maximilian Köhler
Publisher : Springer Nature
Page : 263 pages
File Size : 40,9 Mb
Release : 2019-09-13
Category : Science
ISBN : 9783030259884

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Searches for the Supersymmetric Partner of the Top Quark, Dark Matter and Dark Energy at the ATLAS Experiment by Nicolas Maximilian Köhler Pdf

Astrophysical observations implying the existence of Dark Matter and Dark Energy, which are not described by the Standard Model (SM) of particle physics, have led to extensions of the SM predicting new particles that could be directly produced at the Large Hadron Collider (LHC) at CERN. Based on 2015 and 2016 ATLAS proton-proton collision data, this thesis presents searches for the supersymmetric partner of the top quark, for Dark Matter, and for DarkEnergy, in signatures with jets and missing transverse energy. Muon detection is key to some of the most important LHC physics results, including the discovery of the Higgs boson and the measurement of its properties. The efficiency with which muons can be detected with the ATLAS detector is measured using Z boson decays. The performance of high-precision Monitored Drift Tube muon chambers under background rates similar to the ones expected for the High Luminosity-LHC is studied.

Search for New Physics in Mono-jet Final States in pp Collisions

Giuliano Gustavino
Search for New Physics in Mono jet Final States in pp Collisions Book PDF

Author : Giuliano Gustavino
Publisher : Springer
Page : 236 pages
File Size : 52,9 Mb
Release : 2017-06-19
Category : Science
ISBN : 9783319588711

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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.

Searches for Dijet Resonances

Lydia Audrey Beresford
Searches for Dijet Resonances Book PDF

Author : Lydia Audrey Beresford
Publisher : Springer
Page : 169 pages
File Size : 44,5 Mb
Release : 2018-09-04
Category : Science
ISBN : 9783319975207

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Searches for Dijet Resonances by Lydia Audrey Beresford Pdf

This book addresses one of the most intriguing mysteries of our universe: the nature of dark matter. The results presented here mark a significant and substantial contribution to the search for new physics, in particular for new particles that couple to dark matter. The first analysis presented is a search for heavy new particles that decay into pairs of hadronic jets (dijets). This pioneering analysis explores unprecedented dijet invariant masses, reaching nearly 7 TeV, and sets constraints on several important new physics models. The two subsequent analyses focus on the difficult low dijet mass region, down to 200 GeV, and employ a novel technique to efficiently gather low-mass dijet events. The results of these analyses transcend the long-standing constraints on dark matter mediator particles set by several existing experiments.

A Search for Displaced Leptons in the ATLAS Detector

Lesya Horyn
A Search for Displaced Leptons in the ATLAS Detector Book PDF

Author : Lesya Horyn
Publisher : Springer Nature
Page : 146 pages
File Size : 45,8 Mb
Release : 2022-02-07
Category : Science
ISBN : 9783030916725

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A Search for Displaced Leptons in the ATLAS Detector by Lesya Horyn Pdf

This thesis presents a search for long-lived particles decaying into displaced electrons and/or muons with large impact parameters. This signature provides unique sensitivity to the production of theoretical lepton-partners, sleptons. These particles are a feature of supersymmetric theories, which seek to address unanswered questions in nature. The signature searched for in this thesis is difficult to identify, and in fact, this is the first time it has been probed at the Large Hadron Collider (LHC). It covers a long-standing gap in coverage of possible new physics signatures. This thesis describes the special reconstruction and identification algorithms used to select leptons with large impact parameters and the details of the background estimation. The results are consistent with background, so limits on slepton masses and lifetimes in this model are calculated at 95% CL, drastically improving on the previous best limits from the Large Electron Positron Collider (LEP).

Search for Exotic Mono-jet Events

Valerio Rossetti
Search for Exotic Mono jet Events Book PDF

Author : Valerio Rossetti
Publisher : Springer
Page : 164 pages
File Size : 49,8 Mb
Release : 2015-08-24
Category : Science
ISBN : 9783319222257

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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.

Searching for Squarks

Samuel Jones
Searching for Squarks Book PDF

Author : Samuel Jones
Publisher : Springer Nature
Page : 223 pages
File Size : 45,6 Mb
Release : 2020-08-27
Category : Science
ISBN : 9783030542887

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Searching for Squarks by Samuel Jones Pdf

This thesis focuses on searches for squarks with the ATLAS detector in "compressed" scenarios where the scalar top is very close in mass to the lightest supersymmetric particle. These models are theoretically appealing because the presence of a quasi-degenerate scalar top enhances the self-annihilation cross-section of the lightest supersymmetric particle, acting therefore as a regulator of the dark matter relic density. Two main analyses are presented: the first is a search for scalar tops decaying to charm quarks. The identification of jets originating from the charm quark is very challenging due to its short lifetime. The calibration of tools for charm-tagging has paved the way to measuring the decay of the Higgs boson to pairs of charm quarks. The second analysis presented is the development of a novel technique for reconstructing low momentum b-hadrons. This tool has enabled the ATLAS collaboration to explore topologies that were previously inaccessible.

Aspects of WIMP Dark Matter Searches at Colliders and Other Probes

Enrico Morgante
Aspects of WIMP Dark Matter Searches at Colliders and Other Probes Book PDF

Author : Enrico Morgante
Publisher : Springer
Page : 212 pages
File Size : 41,8 Mb
Release : 2017-10-05
Category : Science
ISBN : 9783319676067

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Aspects of WIMP Dark Matter Searches at Colliders and Other Probes by Enrico Morgante Pdf

This thesis covers several theoretical aspects of WIMP (weakly interacting massive particles) dark matter searches, with a particular emphasis on colliders. It mainly focuses on the use of effective field theories as a tool for Large Hadron Collider (LHC) searches, discussing in detail the issue of their validity, and on simplified dark matter models, which are receiving a growing attention from the physics community. It highlights the theoretical consistency of simplified models, which is essential in order to correctly exploit their potential and for them to be a common reference when comparing results from different experiments. This thesis is of interest to researchers (both theorists and experimentalists) in the field of dark matter searches, and offers a comprehensive introduction to dark matter and to WIMP searches for students and non-experts.

Particle Dark Matter

Gianfranco Bertone
Particle Dark Matter Book PDF

Author : Gianfranco Bertone
Publisher : Cambridge University Press
Page : 763 pages
File Size : 41,5 Mb
Release : 2010-01-07
Category : Science
ISBN : 9781139484985

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Particle Dark Matter by Gianfranco Bertone Pdf

Dark matter is among the most important open problems in modern physics. Aimed at graduate students and researchers, this book describes the theoretical and experimental aspects of the dark matter problem in particle physics, astrophysics and cosmology. Featuring contributions from 48 leading theorists and experimentalists, it presents many aspects, from astrophysical observations to particle physics candidates, and from the prospects for detection at colliders to direct and indirect searches. The book introduces observational evidence for dark matter along with a detailed discussion of the state-of-the-art of numerical simulations and alternative explanations in terms of modified gravity. It then moves on to the candidates arising from theories beyond the Standard Model of particle physics, and to the prospects for detection at accelerators. It concludes by looking at direct and indirect dark matter searches, and the prospects for detecting the particle nature of dark matter with astrophysical experiments.

Dark Matter and Dark Energy

Sabino Matarrese,Monica Colpi,Vittorio Gorini,Ugo Moschella
Dark Matter and Dark Energy Book PDF

Author : Sabino Matarrese,Monica Colpi,Vittorio Gorini,Ugo Moschella
Publisher : Springer Science & Business Media
Page : 413 pages
File Size : 48,5 Mb
Release : 2011-02-10
Category : Science
ISBN : 9789048186853

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Dark Matter and Dark Energy by Sabino Matarrese,Monica Colpi,Vittorio Gorini,Ugo Moschella Pdf

This book brings together reviews from leading international authorities on the developments in the study of dark matter and dark energy, as seen from both their cosmological and particle physics side. Studying the physical and astrophysical properties of the dark components of our Universe is a crucial step towards the ultimate goal of unveiling their nature. The work developed from a doctoral school sponsored by the Italian Society of General Relativity and Gravitation. The book starts with a concise introduction to the standard cosmological model, as well as with a presentation of the theory of linear perturbations around a homogeneous and isotropic background. It covers the particle physics and cosmological aspects of dark matter and (dynamical) dark energy, including a discussion of how modified theories of gravity could provide a possible candidate for dark energy. A detailed presentation is also given of the possible ways of testing the theory in terms of cosmic microwave background, galaxy redshift surveys and weak gravitational lensing observations. Included is a chapter reviewing extensively the direct and indirect methods of detection of the hypothetical dark matter particles. Also included is a self-contained introduction to the techniques and most important results of numerical (e.g. N-body) simulations in cosmology. " This volume will be useful to researchers, PhD and graduate students in Astrophysics, Cosmology Physics and Mathematics, who are interested in cosmology, dark matter and dark energy.

Behind the Scenes of the Universe

Gianfranco Bertone
Behind the Scenes of the Universe Book PDF

Author : Gianfranco Bertone
Publisher : OUP Oxford
Page : 192 pages
File Size : 46,7 Mb
Release : 2013-10-10
Category : Science
ISBN : 9780191505577

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Behind the Scenes of the Universe by Gianfranco Bertone Pdf

An extraordinary discovery has recently shaken the foundations of Cosmology and Particle Physics, sparking a scientific revolution that has profoundly modified our understanding of our Universe and that is still far from over. Pioneering astronomers in the 1920s and 1930s had already noticed suspicious anomalies in the motion of celestial bodies in distant galaxies and clusters of galaxies, but it wasn't until the late 20th century that the scientific community was confronted with an astonishing conclusion: the Universe is filled with an unknown, elusive substance that is fundamentally different from anything we have ever seen with our telescopes or measured in our laboratories. It is called dark matter, and it constitutes one of the most pressing challenges of modern science. In this book, aimed at the general reader with an interest in science, the author illustrates in non-technical terms, borrowing concepts and ideas from other branches of art and literature, the far-reaching implications of this discovery. It has led to a worldwide race to identify the nature of this mysterious form of matter. We may be about to witness a pivotal paradigm shift in Physics, as we set out to test the existence of dark matter particles with a wide array of experiments, including the Large Hadron Collider at CERN, as well as with a new generation of Astroparticle experiments underground and in space.

Advances in Cosmology

Marilena Streit-Bianchi,Paola Catapano,Cristiano Galbiati,Enrico Magnani
Advances in Cosmology Book PDF

Author : Marilena Streit-Bianchi,Paola Catapano,Cristiano Galbiati,Enrico Magnani
Publisher : Springer Nature
Page : 382 pages
File Size : 46,7 Mb
Release : 2022-12-04
Category : Science
ISBN : 9783031056253

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Advances in Cosmology by Marilena Streit-Bianchi,Paola Catapano,Cristiano Galbiati,Enrico Magnani Pdf

Cosmology’s journey to the present day has been a long one. This book outlines the latest research on modern cosmology and related topics from world-class experts. Through it, readers will learn how multi-disciplinary approaches and technologies are used to search the unknown and how we arrived at the knowledge used and assumptions made by cosmologists today. The book is organized into four parts, each exploring a theme that has troubled humankind for centuries. Since the dawn of time, looking at the sky, humans have tried to understand their origin, the laws governing it, and what influence it all has on human life. In most ancient civilizations, astronomers embodied the power of knowledge. This knowledge was not compartmentalized, and scientists often found philosophical implications within their quests, many of which destroyed the borders between the natural sciences. Even now, as observers and scientists continue to use conjecture to generate theoretical assumptions and laws that then have to be confirmed experimentally, said theoretical and experimental searches are being linked to philosophical thinking and artistic representation, as they were up until the 18th century. This multi-disciplinary book will appeal to anyone with an interest in the fields of Astronomy, Cosmology or Physics.