A Search For Top Antitop Quark Resonances With The Atlas Detector At The Lhc
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Search For Top Antitop Quark Resonances With The Atlas Detector At The Large Hadron Collider
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Author : Bertrand Chapleau
language : en
Publisher:
Release Date : 2014
Search For Top Antitop Quark Resonances With The Atlas Detector At The Large Hadron Collider written by Bertrand Chapleau and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
"The intriguing nature of the top quark, by far the heaviest particle in the Standard Model of particle physics, has motivated the development of many theoretical extensions predicting the existence of new massive particles decaying to a pair of top-antitop quarks. The production of these hypothetical particles in proton-proton collisions at the Large Hadron Collider would reveal itself as a resonance in the expected smooth distribution of the top-antitop quark invariant mass. This thesis presents a search for such a new heavy particle decaying to a pair of top-antitop quarks in the semi-leptonic final state. The analyzed data sample amounts to a total of 4.6 fb-1 at a proton-proton collision center-of-mass energy of 7 TeV. Novel techniques specifically tailored to the identification of the decay products of highly energetic top quarks are developed and used. No evidence for resonant production of pairs of top-antitop quarks is found and, as a result, constraints are set on two theoretical models. Upper limits on the production cross-section times branching ratio are established at a 95% credibility level for a leptophobic Zʹ boson from the Topcolor model, and a Kaluza-Klein gluon from the Randall-Sundrum model. The Zʹ boson and the Kaluza-Klein gluon are excluded to exist (at a 95% credibility level) in the mass ranges 0.8-1.65 TeV and 0.8-1.88 TeV, respectively. The constraints de- rived in this thesis on the two theoretical models are more stringent than the ones obtained at other experiments, thanks to the large center-of-mass energy and the dedicated high-energy top quark identification techniques used." --
A Search For Top Antitop Quark Resonances With The Atlas Detector At The Lhc
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Author : Anna Duncan
language : en
Publisher:
Release Date : 2018
A Search For Top Antitop Quark Resonances With The Atlas Detector At The Lhc written by Anna Duncan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with Large Hadron Collider (France and Switzerland) categories.
Top Quark Physics At Hadron Colliders
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Author : Arnulf Quadt
language : en
Publisher: Springer Science & Business Media
Release Date : 2007-08-16
Top Quark Physics At Hadron Colliders written by Arnulf Quadt and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-08-16 with Science categories.
This will be a required acquisition text for academic libraries. More than ten years after its discovery, still relatively little is known about the top quark, the heaviest known elementary particle. This extensive survey summarizes and reviews top-quark physics based on the precision measurements at the Fermilab Tevatron Collider, as well as examining in detail the sensitivity of these experiments to new physics. Finally, the author provides an overview of top quark physics at the Large Hadron Collider.
Search For New Phenomena In Top Antitop Quarks Final States With Additional Heavy Flavour Jets With The Atlas Detector
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Author : Daiki Yamaguchi
language : en
Publisher: Springer Nature
Release Date : 2019-10-30
Search For New Phenomena In Top Antitop Quarks Final States With Additional Heavy Flavour Jets With The Atlas Detector written by Daiki Yamaguchi and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-10-30 with Science categories.
This book reports on the search for a new heavy particle, the Vector-Like Top quark (VLT), in the Large Hadron Collider (LHC) at CERN. The signal process is the pair production of VLT decaying into a Higgs boson and top quark (TT→Ht+X, X=Ht, Wb, Zt). The signal events result in top–antitop quarks final states with additional heavy flavour jets. The book summarises the analysis of the data collected with the ATLAS detector in 2015 and 2016. In order to better differentiate between signals and backgrounds, exclusive taggers of top quark and Higgs boson were developed and optimised for VLT signals. These efforts improved the sensitivity by roughly 30%, compared to the previous analysis. The analysis outcomes yield the strongest constraints on parameter space in various BSM theoretical models. In addition, the book addresses detector operation and the evaluation of tracking performance. These efforts are essential to properly collecting dense events and improving the accuracy of the reconstructed objects that are used for particle identification. As such, they represent a valuable contribution to data analysis in extremely dense environments.
Advances In Jet Substructure At The Lhc
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Author : Roman Kogler
language : en
Publisher: Springer Nature
Release Date : 2021-05-10
Advances In Jet Substructure At The Lhc written by Roman Kogler and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-05-10 with Science categories.
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.
Searches For Top Antitop Resonances In Proton Proton Collisions At A Center Of Mass Energy Of 7 Tev With The Atlas Detector
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Author : Jean-Raphael Lessard
language : en
Publisher:
Release Date : 2012
Searches For Top Antitop Resonances In Proton Proton Collisions At A Center Of Mass Energy Of 7 Tev With The Atlas Detector written by Jean-Raphael Lessard and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
The LHC and the ATLAS detector offer an unprecedented opportunity to test theories beyond the Standard Model of particle physics. Some of these theories predict heavy particles that would decay predominantly into a top and an antitop quark. This thesis presents a technique to experimentally measure the invariant mass (Mtt) of top-antitop pairs, event-by-event, allowing for a complete reconstruction of the Mtt spectrum. Two different models of heavy narrow resonances were considered: a particle X with a negligible mass width, and a Z' particle. Under these models, no resonances in the Mtt spectrum were found in 35.3 pb-1 of 7 TeV centre of mass proton-proton collision data. An upper limit on the production cross section times the branching ratio of the heavy particle decaying into a top-antitop (Sup) as a function of its mass (Mx or Mz) was established at a 95% confidence level. Including systematic errors, the observed (expected) Sup at 95% varies from 3.2 pb (27.9 +11.3 -19.9 pb) to 77.7 pb (9.8 +10.7 -5.6 pb) for Mx ranging from 760 GeV to 1000 GeV, and from 2.9 pb (55.9 +56.9 -47.0 pb) to 43.4 pb (7.8 +8.9 -4.7 pb) for Mz ranging from 700 GeV to 1000 GeV.
Adventure Of The Large Hadron Collider The From The Big Bang To The Higgs Boson
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Author : Daniel Denegri
language : en
Publisher: World Scientific
Release Date : 2021-11-08
Adventure Of The Large Hadron Collider The From The Big Bang To The Higgs Boson written by Daniel Denegri and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-11-08 with Science categories.
An introduction to the world of quarks and leptons, and of their interactions governed by fundamental symmetries of nature, as well as an introduction to the connection that exists between worlds of the infinitesimally small and the infinitely large.The book begins with a simple presentation of the theoretical framework, the so-called Standard Model, which evolved gradually since the 1960s. The key experiments establishing it as the theory of elementary particle physics, but also its missing pieces and conceptual weaknesses are introduced. The book proceeds with the extraordinary story of the Large Hadron Collider at CERN — the largest purely scientific project ever realized. Conception, design and construction by worldwide collaborations of the detectors of size and complexity without precedent in scientific history are discussed. The book then offers the reader a state-of-the art (2020) appreciation of the depth and breadth of the physics exploration performed by the LHC experiments: the study of new forms of matter, the understanding of symmetry-breaking phenomena at the fundamental level, the exciting searches for new physics such as dark matter, additional space dimensions, new symmetries, and more. The adventure of the LHC culminated in the discovery of the Higgs boson in 2012 (Nobel Prize in Physics in 2013). The last chapter of this book describes the plans for the LHC during the next 15 years of exploitation and improvement, and the possible evolution of the field and future collider projects under consideration.The authors are researchers from CERN, CEA and CNRS (France), and deeply engaged in the LHC program: D Denegri in the CMS experiment, C Guyot, A Hoecker and L Roos in the ATLAS experiment. Some of them are involved since the inception of the project. They give a lively and accessible inside view of this amazing scientific and human adventure.
Search For Heavy Resonance Decays Into Top Quark Pairs Using A Lepton Plus Jets Final State In Proton Proton Collisions At S
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Author : Kyle Krowpman
language : en
Publisher:
Release Date : 2022
Search For Heavy Resonance Decays Into Top Quark Pairs Using A Lepton Plus Jets Final State In Proton Proton Collisions At S written by Kyle Krowpman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with Electronic dissertations categories.
This thesis presents two studies in a search for new heavy resonances with 139 fb-1 of proton-proton collisions delivered by the Large Hadron Collider at √s = 13 TeV as measured by the ATLAS detector. In many Standard Model extensions, the top quark plays an important role in the dynamics of electroweak symmetry breaking, and so the studies presented here focus on heavy resonance searches in the top-antitop decay channel and their combination with searches for heavy resonances decaying into other final states. The first study detailed in this thesis is a search for new heavy resonances in a semileptonically decaying top-antitop final state where no significant excesses of data were observed with respect to the background prediction. That being so, exclusion limits at the 95% confidence level were placed on possible resonant masses for a Z′ in a leptophobic topcolor-assisted technicolor model and for a bulk Randall-Sundrum graviton at 4.2 TeV and 1.0 TeV, respectively. This top-antitop search was combined with searches in orthogonal final states performed by the ATLAS Collaboration from which limit contours were placed at the 95% confidence level in the space of couplings to Standard Model particles for the Heavy Vector Triplet model.
A Search For Massive Top Quark Resonances With The Atlas Detector At The Large Hadron Collider
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Author : Sarah Stephanie Alexandra Livermore
language : en
Publisher:
Release Date : 2012
A Search For Massive Top Quark Resonances With The Atlas Detector At The Large Hadron Collider written by Sarah Stephanie Alexandra Livermore and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
Cern Courier
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Author :
language : en
Publisher:
Release Date : 2013
Cern Courier written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Nuclear energy categories.