Measurement Of The Mathrm T Bar T Production Cross Section In The Mathrm E Mu Channel In Proton Proton Collisions At Sqrt S
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Measurement Of The Mathrm T Bar T Production Cross Section In The Mathrm E Mu Channel In Proton Proton Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2016
Measurement Of The Mathrm T Bar T Production Cross Section In The Mathrm E Mu Channel In Proton Proton Collisions At Sqrt 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 2016 with categories.
The inclusive cross section for top quark pair production is measured in proton-proton collisions at √s = 7 and 8 TeV, corresponding to 5.0 and 19.7 fb-1, respectively, with the CMS experiment at the LHC. The cross sections are measured in the electron-muon channel using a binned likelihood fit to multi-differential final state distributions related to identified b quark jets and other jets in the event. The measured cross section values are 173.6 ± 2.1 (stat)+4.5-4.0 (syst) ± 3.8 (lumi) pb at √s = 7 TeV, and 244.9 ± 1.4 (stat)+6.3-5.5 (syst) ± 6.4 (lumi) pb at √s = 8 TeV, in good agreement with QCD calculations at next-to-next-to-leading-order accuracy. The ratio of the cross sections measured at 7 and 8 TeV is determined, as well as cross sections in the fiducial regions defined by the acceptance requirements on the two charged leptons in the final state. The cross section results are used to determine the top quark pole mass via the dependence of the theoretically predicted cross section on the mass, giving a best result of 173.8+1.7-1.8 GeV. Furthermore, the data at √s = 8 TeV are also used to set limits, for two neutralino mass values, on the pair production of supersymmetric top squarks with masses close to the top quark mass.
An Introduction To Regge Theory And High Energy Physics
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Author : P. D. B. Collins
language : en
Publisher: Cambridge University Press
Release Date : 2023-07-27
An Introduction To Regge Theory And High Energy Physics written by P. D. B. Collins 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 2023-07-27 with Science categories.
Monograph on the theory of the complex angular momentum plane known as 'Regge theory'; now reissued as Open Access.
Measurement Of The Mathrm T Bar T Production Cross Section Using Events In The Mathrm E Mu Final State In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2016
Measurement Of The Mathrm T Bar T Production Cross Section Using Events In The Mathrm E Mu Final State In Pp Collisions At Sqrt 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 2016 with categories.
The cross section of top quark-antiquark pair production in proton-proton collisions at $\sqrt{s}$ = 13 TeV is measured by the CMS experiment at the LHC, using data corresponding to an integrated luminosity of 2.2 inverse femtobarns. The measurement is performed by analyzing events in which the final state includes one electron, one muon, and two or more jets, at least one of which is identified as originating from hadronization of a b quark. The measured cross section is 792 +/- 8 (stat) +/- 37 (syst) +/- 21 (lumi) pb, in agreement with the expectation from the standard model.
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.
The Structure Of The Proton
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Author : R. G. Roberts
language : en
Publisher: Cambridge University Press
Release Date : 1990-11-30
The Structure Of The Proton written by R. G. Roberts 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 1990-11-30 with Science categories.
This book describes our present knowledge of protons and neutrons. Experiments using high-energy electrons, muons, and neutrinos reveal that the proton is made up of point-like constituents, i.e. quarks. The strong forces that bind quarks together, gluons, are described in terms of the modern theory of quantum chromodynamics (QCD). Larger and newer particle accelerators provide an opportunity to see deeper into the proton and probe the interactions between quarks and gluons at shorter distances. An understanding of this detailed substructure and of the fundamental forces responsible is one of the keys to unraveling the physics of the structure of matter.
Biophysical Chemistry Of Proteins
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Author : Engelbert Buxbaum
language : en
Publisher: Springer Science & Business Media
Release Date : 2010-11-18
Biophysical Chemistry Of Proteins written by Engelbert Buxbaum 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 2010-11-18 with Science categories.
The book is structured in nine sections, each containing several chapters. The volume starts with an overview of analytical techniques and progresses through purification of proteins; protein modification and inactivation; protein size, shape, and structure; enzyme kinetics; protein-ligand interactions; industrial enzymology; and laboratory quality control. The book is targeted at all scientists interested in protein research.
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.
Mechanics And Thermodynamics
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Author : Wolfgang Demtröder
language : en
Publisher: Springer
Release Date : 2017-02-06
Mechanics And Thermodynamics written by Wolfgang Demtröder and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-02-06 with Science categories.
This introduction to classical mechanics and thermodynamics provides an accessible and clear treatment of the fundamentals. Starting with particle mechanics and an early introduction to special relativity this textbooks enables the reader to understand the basics in mechanics. The text is written from the experimental physics point of view, giving numerous real life examples and applications of classical mechanics in technology. This highly motivating presentation deepens the knowledge in a very accessible way. The second part of the text gives a concise introduction to rotational motion, an expansion to rigid bodies, fluids and gases. Finally, an extensive chapter on thermodynamics and a short introduction to nonlinear dynamics with some instructive examples intensify the knowledge of more advanced topics. Numerous problems with detailed solutions are perfect for self study.
Foundations Of Perturbative Qcd
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Author : John Collins
language : en
Publisher: Cambridge University Press
Release Date : 2023-07-27
Foundations Of Perturbative Qcd written by John Collins 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 2023-07-27 with Science categories.
A systematic treatment of perturbative QCD, the theory of the strong interaction, for graduate students and researchers in high-energy physics.
Crystal Channeling And Its Application At High Energy Accelerators
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Author : Valery M. Biryukov
language : en
Publisher: Springer Science & Business Media
Release Date : 1997-04-16
Crystal Channeling And Its Application At High Energy Accelerators written by Valery M. Biryukov 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 1997-04-16 with Science categories.
"Nature performs not hing vainly, and makes nothing unnecessary" Aristotle Interest in the passage of charged particles through crystals first appeared at the beginning of this century following experiments on x-ray diffraction in crystallattices, which provided the proof of an ordered distribution of atoms in a crystal. Stark [1] put forward the hypothesis that certain directions in a crystal should be relatively transparent to charged particles. These first ideas on the channeling of charged particles in crystals were forgotten but became topical again in the early 1960s when the channeling effect was rediscovered by computer simulation [2] and in experiments [3] that revealed anomalously long ion ranges in crystals. The orientational ef fects during the passage of charged particles through crystals have been found for a whole range of processes characterized by small impact parameters for collisions between particles and atoms: nuclear reactions, large-angle scatter ing, energy losses. Lindhard explained the channeling of charged particles in crystals [4]. The results of the numerous investigations into the channeling of low-energy (amounting to several MeV) charged particles in crystals have been summarized in several monographs and reviews [5~8l.