Measurement Of The T Bar T Production Cross Section Using Events With One Lepton And At Least One Jet In Pp Collisions At Sqrt S
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Measurement Of The T Bar T Production Cross Section Using Events With One Lepton And At Least One Jet In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2017
Measurement Of The T Bar T Production Cross Section Using Events With One Lepton And At Least One Jet 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 2017 with categories.
A measurement of the $\mathrm{ t \bar{t} }$ production cross section at $\sqrt{s}=$ 13 TeV is presented using proton-proton collisions, corresponding to an integrated luminosity of 2.3 fb$^{-1}$, collected with the CMS detector at the LHC. Final states with one isolated charged lepton (electron or muon) and at least one jet are selected and categorized according to the accompanying jet multiplicity. From a likelihood fit to the invariant mass distribution of the isolated lepton and a jet identified as coming from the hadronization of a bottom quark, the cross section is measured to be $\sigma(\mathrm{ t \bar{t} })=$ 835 $\pm$ 3 (stat) $\pm$ 23 (syst) $\pm$ 23 (lumi) pb, in agreement with the standard model prediction. Using the expected dependence of the cross section on the pole mass of the top quark ($m_{\mathrm{ t }}$), the value of $m_{\mathrm{ t }}$ is found to be 172.7$^{+2.4}_{-2.7}$ GeV.
Government Reports Announcements Index
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Author :
language : en
Publisher:
Release Date : 1985-03
Government Reports Announcements Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985-03 with Science categories.
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.
The Anomalous Magnetic Moment Of The Muon
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Author : Fred Jegerlehner
language : en
Publisher: Springer Science & Business Media
Release Date : 2008
The Anomalous Magnetic Moment Of The Muon written by Fred Jegerlehner 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 2008 with Science categories.
This book reviews the present state of knowledge of the anomalous magnetic moment a=(g-2)/2 of the muon. The muon anomalous magnetic moment is one of the most precisely measured quantities in elementary particle physics and provides one of the most stringent tests of relativistic quantum field theory as a fundamental theoretical framework. It allows for an extremely precise check of the standard model of elementary particles and of its limitations.
The Black Book Of Quantum Chromodynamics A Primer For The Lhc Era
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Author : John Campbell
language : en
Publisher: Oxford University Press
Release Date : 2018-01-19
The Black Book Of Quantum Chromodynamics A Primer For The Lhc Era written by John Campbell and has been published by Oxford University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-01-19 with Science categories.
The Black Book of Quantum Chromodynamics is an in-depth introduction to the particle physics of current and future experiments at particle accelerators. The book offers the reader an overview of practically all aspects of the strong interaction necessary to understand and appreciate modern particle phenomenology at the energy frontier. It assumes a working knowledge of quantum field theory at the level of introductory textbooks used for advanced undergraduate or in standard postgraduate lectures. The book expands this knowledge with an intuitive understanding of relevant physical concepts, an introduction to modern techniques, and their application to the phenomenology of the strong interaction at the highest energies. Aimed at graduate students and researchers, it also serves as a comprehensive reference for LHC experimenters and theorists. This book offers an exhaustive presentation of the technologies developed and used by practitioners in the field of fixed-order perturbation theory and an overview of results relevant for the ongoing research programme at the LHC. It includes an in-depth description of various analytic resummation techniques, which form the basis for our understanding of the QCD radiation pattern and how strong production processes manifest themselves in data, and a concise discussion of numerical resummation through parton showers, which form the basis of event generators for the simulation of LHC physics, and their matching and merging with fixed-order matrix elements. It also gives a detailed presentation of the physics behind the parton distribution functions, which are a necessary ingredient for every calculation relevant for physics at hadron colliders such as the LHC, and an introduction to non-perturbative aspects of the strong interaction, including inclusive observables such as total and elastic cross sections, and non-trivial effects such as multiple parton interactions and hadronization. The book concludes with a useful overview contextualising data from previous experiments such as the Tevatron and the Run I of the LHC which have shaped our understanding of QCD at hadron colliders.
Measurement Of The T T Bar Production Cross Section In Pp Collisions At 7 Tev In Lepton Jets Events Using B Quark Jet Identification
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Author :
language : en
Publisher:
Release Date : 2011
Measurement Of The T T Bar Production Cross Section In Pp Collisions At 7 Tev In Lepton Jets Events Using B Quark Jet Identification written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
A new measurement of the inclusive production cross section for pp to t t-bar is performed at a center-of-mass energy of 7 TeV using data collected by the CMS experiment at the LHC. The analysis uses a data sample corresponding to an integrated luminosity of 36 inverse picobarns, and is based on the final state with one isolated, high transverse momentum muon or electron, missing transverse energy, and hadronic jets. The ttbar content of the selected events is enhanced by requiring the presence of at least one jet consistent with b-quark hadronization. The measured cross section is 150 +/- 9 (stat.) +/- 17 syst.) +/- 6 (lumi.) pb and is in agreement with higher-order QCD calculations. The combination of this measurement with a previous CMS result based on dileptons gives 154 +/- 17 (stat.+syst.) +/- 6 (lumi.) pb.
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.
The Lund Model
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Author : Bo Andersson
language : en
Publisher: Cambridge University Press
Release Date : 1998-10-08
The Lund Model written by Bo Andersson 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 1998-10-08 with Science categories.
This 1998 book describes the very successful Lund model of the dynamics of particle physics.
Astroparticle Physics
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Author : Claus Grupen
language : en
Publisher: Springer Nature
Release Date : 2020-01-27
Astroparticle Physics written by Claus Grupen and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-01-27 with Science categories.
This second, revised and thoroughly updated edition of the successful textbook by Claus Grupen describes the branch of astrophysics known as astroparticle physics. Using experimental methods known from cosmic ray and particle physics, astroparticle physics investigates processes of highest energies taking place in the universe. The new edition reports on progress made by recent discoveries in gravitational wave astronomy and neutrino astronomy (including all details needed to understand recent discoveries in multi-messenger experiments) and also astrobiology. After a historical introduction to the basics of elementary particles the author describes their interactions and the relevant detection techniques. The main body of the book concerns cosmic rays as well as particle processes in astrophysics and cosmology including the physics of the early universe. The book provides an orientation in the field of astroparticle physics that many beginners might be looking for.It also presents new sections exploring the interface between particle physics and cosmic radiation and illustrates the impact of particle physics discoveries to astroparticle physics. The physics is presented using little mathematics, and the results are illustrated by many diagrams and illustrative scientific cartoons which ease the reading of the book. Closing the gap between expert and popular level, the book is highly recommended for undergraduate students in physics or astronomy. It also includes an extensive glossary and a detailed index.
Particles And Nuclei
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Author : Bogdan Povh
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-04-17
Particles And Nuclei written by Bogdan Povh 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 2013-04-17 with Science categories.
Experimental evidenees for non vanishing neutrino masses are now very eon vincing. In the third English edition we have rewritten the paragraphs in which, in the previous edition the question of the neutrino mass has been left open. We have mueh appreciated the diseussions with Stephan Sehönert (Heidel berg) on the new results of the neutrino oseillations and their interpretations. We would like to thank Martin Lavelle (Plymouth) for the translation of the newly written paragraphs and Jürgen Sawinski (Heidelberg) for the exeellent work he has done in reformatting the book. Heidelberg, May 2002 Bogdan Povh Preface to the Second Edition The second English edition has been updated from the fifth edition of the original German text. The principal addition is a chapter on nuclear ther modynamics. We consider in this chapter the behaviour of nuclear matter at high temperature, how it may be studied in the laboratory, via heavy ion experiments and how it was of great importance in the initial stages of the universe. Such a phase of matter may be described and interpreted using the tools of thermodynamics. In this way a connection between particle and nuclear physics and the currently exciting research areas of cosmology and astrophysics may be constructed. We would like to thank Martin Lavelle (Plymouth) for the translation of the new chapter and for revising the old text and Jürgen Sawinski (Heidelberg) for the excellent work he has done in reformatting the book.