Measurement Of The Top Pair Production Cross Section In 8 Tev Proton Proton Collisions Using Kinematic Information In The Lepton Jets Final State With Atlas
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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
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Author : Anna Christine Henrichs
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-10-04
Top Quark Pair Production written by Anna Christine Henrichs 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 2013-10-04 with Science categories.
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.
Measurement Of The Top Pair Production Cross Section In 8 Tev Proton Proton Collisions Using Kinematic Information In The Lepton Plus Jets Final State With Atlas
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Author :
language : en
Publisher:
Release Date : 2015
Measurement Of The Top Pair Production Cross Section In 8 Tev Proton Proton Collisions Using Kinematic Information In The Lepton Plus Jets Final State With Atlas 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.
Lepton Photon Interactions At High Energies Lepton Photon 2017 Proceedings Of The 28th International Symposium
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Author : Wei Wang
language : en
Publisher: World Scientific
Release Date : 2020-02-27
Lepton Photon Interactions At High Energies Lepton Photon 2017 Proceedings Of The 28th International Symposium written by Wei Wang and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-02-27 with Science categories.
The latest of the 'Lepton Photon' symposium, one of the well-established series of meetings in the high-energy physics community, was successfully organized at the South Campus of Sun Yat-sen University, Guangzhou, China, from August 7-12, 2017, where physicists around the world gathered to discuss the latest advancements in the research field.This proceedings volume of the Lepton Photon 2017 collects contributions by the plenary session speakers and the posters' presenters, which cover the latest results in particle physics, nuclear physics, astrophysics, cosmology, and plans for future facilities.
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.
Measurement Of The Top Pair Production Cross Section In 8 Tev Proton Proton Collisions Using Kinematic Information In The Lepton Jets Final State With Atlas
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Author :
language : en
Publisher:
Release Date : 2015
Measurement Of The Top Pair Production Cross Section In 8 Tev Proton Proton Collisions Using Kinematic Information In The Lepton Jets Final State With Atlas 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.
Symmetry In Particle Physics
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Author : Michal Hnatič
language : en
Publisher: MDPI
Release Date : 2021-06-24
Symmetry In Particle Physics written by Michal Hnatič and has been published by MDPI this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-06-24 with Mathematics categories.
Particle physics is a science about the symmetries of our world. The Standard Model is the fundamental theory of microworld. Particle dynamics in the Standard Model obeys strict symmetry laws with explicit experimental consequences. Priority problems of particle physics based on the Standard Model are more accurate theoretical predictions, experimental measurements and data analysis, proof of existence or non-existence of supersymmetry, top quark properties, Higgs boson, exotic quark states, and physics of neutrinos. In this collection of articles, many of these problems are discussed. We recommend this book for students, graduate students, and scientists working in the field of high energy physics.
From The Fermi Scale To Cosmology
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Author : Alberto Salvio
language : en
Publisher: Frontiers Media SA
Release Date : 2019-12-06
From The Fermi Scale To Cosmology written by Alberto Salvio and has been published by Frontiers Media SA this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-12-06 with categories.
Higgs Supersymmetry And Dark Matter After Run I Of The Lhc
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Author : Béranger Dumont
language : en
Publisher: Springer
Release Date : 2016-09-21
Higgs Supersymmetry And Dark Matter After Run I Of The Lhc written by Béranger Dumont and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-09-21 with Science categories.
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.
Measurements Of The T Tbar Production Cross Section In Lepton Jets Final States In Pp Collisions At 8 Tev And Ratio Of 8 To 7 Tev Cross Sections
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Author :
language : en
Publisher:
Release Date : 2016
Measurements Of The T Tbar Production Cross Section In Lepton Jets Final States In Pp Collisions At 8 Tev And Ratio Of 8 To 7 Tev Cross Sections written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
A measurement of the top quark pair production (t-tbar) cross section in proton-proton collisions at the centre-of-mass energy of 8 TeV is presented using data collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 19.6 inverse-femtobarns. This analysis is performed in the t-tbar decay channels with one isolated, high transverse momentum electron or muon and at least four jets, at least one of which is required to be identified as originating from hadronization of a b quark. The calibration of the jet energy scale and the efficiency of b jet identification are determined from data. The measured t-tbar cross section is 228.5 +/- 3.8 (stat) +/- 13.7 (syst) +/- 6.0 (lumi) pb. This measurement is compared with an analysis of 7 TeV data, corresponding to an integrated luminosity of 5.0 inverse-femtobarns, to determine the ratio of 8 TeV to 7 TeV cross sections, which is found to be 1.43 +/- 0.04 (stat) +/- 0.07 (syst) +/- 0.05 (lumi). The measurements are in agreement with QCD predictions up to next-to-next-to-leading order.