Measurement Of Top Antitop Differential Cross Sections In The Di Lepton Channel With Atlas In P P Collisions At 7tev
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Measurement Of Top Antitop Differential Cross Sections In The Di Lepton Channel With Atlas In P P Collisions At 7tev
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Author :
language : en
Publisher:
Release Date : 2015
Measurement Of Top Antitop Differential Cross Sections In The Di Lepton Channel With Atlas In P P Collisions At 7tev written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Spin Correlations In Tt Events From Pp Collisions
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Author : Boris Lemmer
language : en
Publisher: Springer
Release Date : 2015-06-24
Spin Correlations In Tt Events From Pp Collisions written by Boris Lemmer and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-06-24 with Science categories.
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.
Top Quark Pair Production Cross Sections And Calibration Of The Top Quark Monte Carlo Mass
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Author : Jan Kieseler
language : en
Publisher: Springer
Release Date : 2016-06-15
Top Quark Pair Production Cross Sections And Calibration Of The Top Quark Monte Carlo Mass written by Jan Kieseler and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-06-15 with Science categories.
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.
Particle Physics At The Year Of Light Proceedings Of The Seventeenth Lomonosov Conference On Elementary Particle Physics
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Author : Alexander I Studenikin
language : en
Publisher: World Scientific
Release Date : 2017-04-17
Particle Physics At The Year Of Light Proceedings Of The Seventeenth Lomonosov Conference On Elementary Particle Physics written by Alexander I Studenikin and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-04-17 with Science categories.
The volume of these proceedings is devoted to a wide variety of items, 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, hadron physics, gravitation and cosmology, physics at the present and future accelerator.
Qcd And Collider Physics
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Author : R. K. Ellis
language : en
Publisher: Cambridge University Press
Release Date : 2003-12-04
Qcd And Collider Physics written by R. K. Ellis and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003-12-04 with Science categories.
A detailed overview of the physics of high-energy colliders emphasising the role of QCD.
Looking Inside Jets
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Author : Simone Marzani
language : en
Publisher: Springer
Release Date : 2019-05-11
Looking Inside Jets written by Simone Marzani and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-05-11 with Science categories.
This concise primer reviews the latest developments in the field of jets. Jets are collinear sprays of hadrons produced in very high-energy collisions, e.g. at the LHC or at a future hadron collider. They are essential to and ubiquitous in experimental analyses, making their study crucial. At present LHC energies and beyond, massive particles around the electroweak scale are frequently produced with transverse momenta that are much larger than their mass, i.e., boosted. The decay products of such boosted massive objects tend to occupy only a relatively small and confined area of the detector and are observed as a single jet. Jets hence arise from many different sources and it is important to be able to distinguish the rare events with boosted resonances from the large backgrounds originating from Quantum Chromodynamics (QCD). This requires familiarity with the internal properties of jets, such as their different radiation patterns, a field broadly known as jet substructure. This set of notes begins by providing a phenomenological motivation, explaining why the study of jets and their substructure is of particular importance for the current and future program of the LHC, followed by a brief but insightful introduction to QCD and to hadron-collider phenomenology. The next section introduces jets as complex objects constructed from a sequential recombination algorithm. In this context some experimental aspects are also reviewed. Since jet substructure calculations are multi-scale problems that call for all-order treatments (resummations), the bases of such calculations are discussed for simple jet quantities. With these QCD and jet physics ingredients in hand, readers can then dig into jet substructure itself. Accordingly, these notes first highlight the main concepts behind substructure techniques and introduce a list of the main jet substructure tools that have been used over the past decade. Analytic calculations are then provided for several families of tools, the goal being to identify their key characteristics. In closing, the book provides an overview of LHC searches and measurements where jet substructure techniques are used, reviews the main take-home messages, and outlines future perspectives.
Introduction To Soft Collinear Effective Theory
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Author : Thomas Becher
language : en
Publisher: Springer
Release Date : 2015-03-04
Introduction To Soft Collinear Effective Theory written by Thomas Becher and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-03-04 with Science categories.
Among resummation techniques for perturbative QCD in the context of collider and flavor physics, soft-collinear effective theory (SCET) has emerged as both a powerful and versatile tool, having been applied to a large variety of processes, from B-meson decays to jet production at the LHC. This book provides a concise, pedagogical introduction to this technique. It discusses the expansion of Feynman diagrams around the high-energy limit, followed by the explicit construction of the effective Lagrangian - first for a scalar theory, then for QCD. The underlying concepts are illustrated with the quark vector form factor at large momentum transfer, and the formalism is applied to compute soft-gluon resummation and to perform transverse-momentum resummation for the Drell-Yan process utilizing renormalization group evolution in SCET. Finally, the infrared structure of n-point gauge-theory amplitudes is analyzed by relating them to effective-theory operators. This text is suitable for graduate students and non-specialist researchers alike as it requires only basic knowledge of perturbative QCD.
The Higgs Hunter S Guide
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Author : John F. Gunion
language : en
Publisher: CRC Press
Release Date : 2018-03-05
The Higgs Hunter S Guide written by John F. Gunion and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-03-05 with Science categories.
The Higgs Hunter's Guide is a definitive and comprehensive guide to the physics of Higgs bosons. In particular, it discusses the extended Higgs sectors required by those recent theoretical approaches that go beyond the Standard Model, including supersymmetry and superstring-inspired models.
Experimental Particle Physics
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Author : Deepak Kar
language : en
Publisher:
Release Date : 2019
Experimental Particle Physics written by Deepak Kar and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Large Hadron Collider (France and Switzerland) categories.
"This book is written for advanced undergraduate or beginning postgraduate student starting data analysis in experimental particle physics, more specifically at the Large Hadron Collider (LHC) at CERN. Only assuming basic knowledge of quantum mechanics and special relativity, it recaps the current state of affairs in particle physics, before comprehensively introducing all the ingredients that go into an analysis. Including how each we go from electronic signals in the detectors to visualising what particles were produced in a collision, and how we determine if that is consistent with Standard Model predictions or indicate the presence of yet unseen particles. The results are usually represented in what we call plots, and the book ensures students can understand what goes into the making of the plots, and how to interpret them." -- Prové de l'editor.
Measurement Of Normalized Differential Tt Cross Sections In The Dilepton Channel From Pp Collisions At S
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Author :
language : en
Publisher:
Release Date : 2017
Measurement Of Normalized Differential Tt Cross Sections In The Dilepton Channel From Pp Collisions At S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.