Download or read book Topics in the Measurement of Top Quark Events with ATLAS written by Stephan A. Sandvoss and published by . This book was released on 2010 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Top Quark Pair Production written by Anna Christine Henrichs and published by Springer Science & Business Media. This book was released on 2013-10-04 with total page 231 pages. Available in PDF, EPUB and Kindle. Book excerpt: Before any kind of new physics discovery could be made at the LHC, a precise understanding and measurement of the Standard Model of particle physics' processes was necessary. The book provides an introduction to top quark production in the context of the Standard Model and presents two such precise measurements of the production of top quark pairs in proton-proton collisions at a center-of-mass energy of 7 TeV that were observed with the ATLAS Experiment at the LHC. The presented measurements focus on events with one charged lepton, missing transverse energy and jets. Using novel and advanced analysis techniques as well as a good understanding of the detector, they constitute the most precise measurements of the quantity at that time.
Download or read book ATLAS Measurements of the Higgs Boson Coupling to the Top Quark in the Higgs to Diphoton Decay Channel written by Jennet Elizabeth Dickinson and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: During Run 2 of the Large Hadron Collider, the ATLAS experiment recorded proton-proton collision events at 13 TeV, the highest energy ever achieved in a collider. Analysis of this dataset has provided new opportunities for precision measurements of the Higgs boson, including its interaction with the top quark. The Higgs-top coupling can be directly probed through the production of a Higgs boson in association with a top-antitop quark pair (ttH). The Higgs to diphoton decay channel is among the most sensitive for ttH measurements due to the excellent diphoton mass resolution of the ATLAS detector and the clean signature of this decay. Event selection criteria were developed using novel Machine Learning techniques to target ttH events, yielding a precise measurement of the ttH cross section in the diphoton channel and a 6.3 $\sigma$ observation of the ttH process in combination with other decay channels, as well as stringent limits on CP violation in the Higgs-top coupling.
Download or read book First Measurement of the Running of the Top Quark Mass written by Matteo M. Defranchis and published by Springer Nature. This book was released on 2022-01-03 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, the first measurement of the running of the top quark mass is presented. This is a fundamental quantum effect that had never been studied before. Any deviation from the expected behaviour can be interpreted as a hint of the presence of physics beyond the Standard Model. All relevant aspects of the analysis are extensively described and documented. This thesis also describes a simultaneous measurement of the inclusive top quark-antiquark production cross section and the top quark mass in the simulation. The measured cross section is also used to precisely determine the values of the top quark mass and the strong coupling constant by comparing to state-of-the-art theoretical predictions. All the theoretical and experimental aspects relevant to the results presented in this thesis are discussed in the initial chapters in a concise but complete way, which makes the material accessible to a wider audience.
Download or read book QCD Radiation in Top Antitop and Z Jets Final States written by Kiran Joshi and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis contains new research in both experimental and theoretical particle physics, making important contributions in each. Two analyses of collision data from the ATLAS experiment at the LHC are presented, as well as two phenomenological studies of heavy coloured resonances that could be produced at the LHC. The first data analysis was the measurement of top quark-antiquark production with a veto on additional jet activity. As the first detector-corrected measurement of jet activity in top-antitop events it played an important role in constraining the theoretical modelling, and ultimately reduced these uncertainties for ATLAS's other top-quark measurements by a factor of two. The second data analysis was the measurement of Z+2jet production and the observation of the electroweak vector boson fusion (VBF) component. As the first observation of VBF at a hadron collider, this measurement demonstrated new techniques to reliably extract VBF processes and paved the way for future VBF Higgs measurements. The first phenomenological study developed a new technique for identifying the colour of heavy resonances produced in proton-proton collisions. As a by-product of this study an unexpected and previously unnoticed correlation was discovered between the probability of correctly identifying a high-energy top and the colour structure of the event it was produced in. The second phenomenological study explored this relationship in more detail, and could have important consequences for the identification of new particles that decay to top quarks.
Download or read book Novel ideas for accelerators particle detection and data challenges at future colliders written by Alessandro Tricoli and published by Frontiers Media SA. This book was released on 2023-07-21 with total page 237 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of the Top Quark Mass in the Dilepton Final State Using the Matrix Element Method written by Alexander Grohsjean and published by Springer Science & Business Media. This book was released on 2010-10-01 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main pacemakers of scienti?c research are curiosity, ingenuity, and a pinch of persistence. Equipped with these characteristics a young researcher will be s- cessful in pushing scienti?c discoveries. And there is still a lot to discover and to understand. In the course of understanding the origin and structure of matter it is now known that all matter is made up of six types of quarks. Each of these carry a different mass. But neither are the particular mass values understood nor is it known why elementary particles carry mass at all. One could perhaps accept some small generic mass value for every quark, but nature has decided differently. Two quarks are extremely light, three more have a somewhat typical mass value, but one quark is extremely massive. It is the top quark, the heaviest quark and even the heaviest elementary particle that we know, carrying a mass as large as the mass of three iron nuclei. Even though there exists no explanation of why different particle types carry certain masses, the internal consistency of the currently best theory—the standard model of particle physics—yields a relation between the masses of the top quark, the so-called W boson, and the yet unobserved Higgs particle. Therefore, when one assumes validity of the model, it is even possible to take precise measurements of the top quark mass to predict the mass of the Higgs (and potentially other yet unobserved) particles.
Download or read book Physics at the Large Hadron Collider written by Amitava Datta and published by Springer Science & Business Media. This book was released on 2010-05-30 with total page 247 pages. Available in PDF, EPUB and Kindle. Book excerpt: In an epoch when particle physics is awaiting a major step forward, the Large Hydron Collider (LHC) at CERN, Geneva will soon be operational. It will collide a beam of high energy protons with another similar beam circulation in the same 27 km tunnel but in the opposite direction, resulting in the production of many elementary particles some never created in the laboratory before. It is widely expected that the LHC will discover the Higgs boson, the particle which supposedly lends masses to all other fundamental particles. In addition, the question as to whether there is some new law of physics at such high energy is likely to be answered through this experiment. The present volume contains a collection of articles written by international experts, both theoreticians and experimentalists, from India and abroad, which aims to acquaint a non-specialist with some basic issues related to the LHC. At the same time, it is expected to be a useful, rudimentary companion of introductory exposition and technical expertise alike, and it is hoped to become unique in its kind. The fact that there is substantial Indian involvement in the entire LHC endeavour, at all levels including fabrication, physics analysis procedures as well as theoretical studies, is also amply brought out in the collection.
Download or read book Top Quark Pair Production Cross Sections and Calibration of the Top Quark Monte Carlo Mass written by Jan Kieseler and published by Springer. This book was released on 2016-06-15 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents the first experimental calibration of the top-quark Monte-Carlo mass. It also provides the top-quark mass-independent and most precise top-quark pair production cross-section measurement to date. The most precise measurements of the top-quark mass obtain the top-quark mass parameter (Monte-Carlo mass) used in simulations, which are partially based on heuristic models. Its interpretation in terms of mass parameters used in theoretical calculations, e.g. a running or a pole mass, has been a long-standing open problem with far-reaching implications beyond particle physics, even affecting conclusions on the stability of the vacuum state of our universe. In this thesis, this problem is solved experimentally in three steps using data obtained with the compact muon solenoid (CMS) detector. The most precise top-quark pair production cross-section measurements to date are performed. The Monte-Carlo mass is determined and a new method for extracting the top-quark mass from theoretical calculations is presented. Lastly, the top-quark production cross-sections are obtained – for the first time – without residual dependence on the top-quark mass, are interpreted using theoretical calculations to determine the top-quark running- and pole mass with unprecedented precision, and are fully consistently compared with the simultaneously obtained top-quark Monte-Carlo mass.
Download or read book Top Quark Physics at Hadron Colliders written by Arnulf Quadt and published by Springer Science & Business Media. This book was released on 2007-08-16 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Issues in Nuclear High Energy Plasma Particle and Condensed Matter Physics 2013 Edition written by and published by ScholarlyEditions. This book was released on 2013-05-01 with total page 1198 pages. Available in PDF, EPUB and Kindle. Book excerpt: Issues in Nuclear, High Energy, Plasma, Particle, and Condensed Matter Physics: 2013 Edition is a ScholarlyEditions™ book that delivers timely, authoritative, and comprehensive information about High Energy Physics. The editors have built Issues in Nuclear, High Energy, Plasma, Particle, and Condensed Matter Physics: 2013 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about High Energy Physics in this book to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Issues in Nuclear, High Energy, Plasma, Particle, and Condensed Matter Physics: 2013 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.
Download or read book Hadron Collider Physics 2005 written by Mario Campanelli and published by Springer Science & Business Media. This book was released on 2007-08-17 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gathers the proceedings of The Hadron Collider Physics Symposia (HCP) 2005, and reviews the state-of-the-art in the key physics directions of experimental hadron collider research. Topics include QCD physics, precision electroweak physics, c-, b-, and t-quark physics, physics beyond the Standard Model, and heavy ion physics. The present volume serves as a reference for everyone working in the field of accelerator-based high-energy physics.
Download or read book Particle Physics Reference Library written by Christian W. Fabjan and published by Springer Nature. This book was released on 2020 with total page 1083 pages. Available in PDF, EPUB and Kindle. Book excerpt: This second open access volume of the handbook series deals with detectors, large experimental facilities and data handling, both for accelerator and non-accelerator based experiments. It also covers applications in medicine and life sciences. A joint CERN-Springer initiative, the "Particle Physics Reference Library" provides revised and updated contributions based on previously published material in the well-known Landolt-Boernstein series on particle physics, accelerators and detectors (volumes 21A, B1,B2,C), which took stock of the field approximately one decade ago. Central to this new initiative is publication under full open access
Download or read book From the Fermi Scale to Cosmology written by Alberto Salvio and published by Frontiers Media SA. This book was released on 2019-12-06 with total page 265 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spin Correlations in tt Events from pp Collisions written by Boris Lemmer and published by Springer. This book was released on 2015-06-24 with total page 233 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis introduces readers to the Standard Model, the top quark and its properties, before explaining the concept of spin correlation measurement. The first measurement of top quark spin correlations at the LHC in the lepton+jets decay channel is presented. As the heaviest elementary particle, the top quark plays an essential role in the Standard Model of elementary particle physics. In the case of top quarks being produced in pairs at hadron colliders, the Standard Model predicts their spins to be correlated. The degree of correlation depends on both the production mechanism and properties of the top quark. Any deviation from the Standard Model prediction can be an indicator for new physics phenomena. The thesis employs an advanced top quark reconstruction algorithm including dedicated identification of the up- and down-type quarks from the W boson decay.
Download or read book Particle and Astroparticle Physics Gravitation and Cosmology Predictions Observations and New Projects written by Vladimir Alexeevich Petrov and published by World Scientific. This book was released on 2015-06-16 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Download or read book Electroweak Interactions and Unified Theories written by J. Thanh Van Tran and published by Atlantica Séguier Frontières. This book was released on 1988 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt:
