The Coming Of Age Of Jet Sustructure At The Lhc
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The Coming Of Age Of Jet Sustructure At The Lhc
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Author : Roman Kogler
language : en
Publisher:
Release Date : 2020
The Coming Of Age Of Jet Sustructure At The Lhc written by Roman Kogler and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
Advances In Jet Substructure At The Lhc
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Author : Roman Kogler
language : en
Publisher:
Release Date : 2021
Advances In Jet Substructure At The Lhc written by Roman Kogler and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with categories.
This book introduces the reader to the field of jet substructure, starting from the basic considerations for capturing decays of boosted particles in individual jets, to explaining state-of-the-art techniques. Jet substructure methods have become ubiquitous in data analyses at the LHC, with diverse applications stemming from the abundance of jets in proton-proton collisions, the presence of pileup and multiple interactions, and the need to reconstruct and identify decays of highly-Lorentz boosted particles. The last decade has seen a vast increase in our knowledge of all aspects of the field, with a proliferation of new jet substructure algorithms, calculations and measurements which are presented in this book. Recent developments and algorithms are described and put into the larger experimental context. Their usefulness and application are shown in many demonstrative examples and the phenomenological and experimental effects influencing their performance are discussed. A comprehensive overview is given of measurements and searches for new phenomena performed by the ATLAS and CMS Collaborations. This book shows the impressive versatility of jet substructure methods at the LHC.
Looking Inside Jets
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Author : Simone Marzani
language : en
Publisher:
Release Date : 2019
Looking Inside Jets written by Simone Marzani and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Astrophysical jets 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.
Jet Substructure For The Lhc
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Author : Martin David Jankowiak
language : en
Publisher:
Release Date : 2012
Jet Substructure For The Lhc written by Martin David Jankowiak and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
The discovery of new physics at the LHC hinges on our ability to discriminate the old (the Standard Model) from the new. The study of the substructure of jets offers a powerful set of techniques for improving the reach of new physics searches at the LHC. Moreover, jet substructure observables are a sensitive probe of QCD dynamics and motivate a variety of tests of QCD. This thesis explores several jet substructure techniques with a particular focus on applications to event discrimination. First, a jet observable is introduced that probes the color structure of pairs of subjets. This observable is incorporated into a top tagging algorithm, where it is shown to improve discrimination between top jets and QCD jets. Second, an alternative approach to jet substructure is introduced that is distinct from the prevailing methods based on the clustering trees induced by sequential jet algorithms. This approach makes use of two-particle angular correlations to identify substructure within jets. In one application, this approach is used to construct a top tagging algorithm that is competitive with existing methods. In another application, ensemble averages of angular correlations are used to study the underlying event and pile-up effects.
The Structure Of Jets At Hadron Colliders
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Author : Andrew James Larkoski
language : en
Publisher:
Release Date : 2012
The Structure Of Jets At Hadron Colliders written by Andrew James Larkoski and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
Jets are collimated, high energy streams of particles that are ubiquitous at hadron colliders such as the Large Hadron Collider (LHC) at CERN in Geneva, Switzerland. It has been recognized that jets are a feature of the strong force, quantum chromodynamics (QCD). QCD predicts an approximate scaling behavior at high energies. Due to the very high energies made available by the LHC, the decay products of heavy, unstable particles can also be collimated into a narrow cone and these are observed as jets by the LHC experiments. Recently, there has been significant interest in studying the substructure of jets with the goal of discriminating QCD jets from jets initiated by heavy particle decay. In this thesis, I will describe the modeling of jets in QCD as well as the pattern of radiation from heavy particles, such as the top quark. This will lead to a discussion of a correlation function on the constituents of a jet that is useful in understanding jet substructure. This correlation function encodes angular scaling properties of jets and its behavior in QCD will be studied.
Jet Substructure At The Large Hadron Collider
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Author : Christopher K. Vermilion
language : en
Publisher:
Release Date : 2010
Jet Substructure At The Large Hadron Collider written by Christopher K. Vermilion and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Jets (Nuclear physics) categories.
Substructure Of High Pt Jets At The Lhc
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Author :
language : en
Publisher:
Release Date : 2008
Substructure Of High Pt Jets At The Lhc written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.
We study high-p{sub T} jets from QCD and from highly-boosted massive particles such as tops, W, Z and Higgs, and argue that infrared-safe observables can help reduce QCD backgrounds. Jets from QCD are characterized by different patterns of energy flow compared to the products of highly-boosted heavy particle decays, and we employ a variety of jet shapes, observables restricted to energy flow within a jet, to explore this difference. Results from Monte Carlo generators and arguments based on perturbation theory support the discriminating power of the shapes we refer to as planar flow and angularities. We emphasize that for massive jets, these and other observables can be analyzed perturbatively.
Jet Substructure At The Lhc With Analytical Methods
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Author : Alessandro Virginio Armando Fregoso
language : en
Publisher:
Release Date : 2014
Jet Substructure At The Lhc With Analytical Methods written by Alessandro Virginio Armando Fregoso and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
Boosted Objects And Jet Substructure At The Lhc
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Author :
language : en
Publisher:
Release Date : 2014
Boosted Objects And Jet Substructure At The Lhc written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
This report of the BOOST2012 workshop presents the results of four working groups that studied key aspects of jet substructure. We discuss the potential of first-principle QCD calculations to yield a precise description of the substructure of jets and study the accuracy of state-of-the-art Monte Carlo tools. Limitations of the experiments' ability to resolve substructure are evaluated, with a focus on the impact of additional (pile-up) proton proton collisions on jet substructure performance in future LHC operating scenarios. The final section summarizes the lessons learnt from jet substructure analyses in searches for new physics in the production of boosted top quarks.
The Large Hadron Collider
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Author : Lyndon R. Evans
language : en
Publisher: EPFL Press
Release Date : 2009-01-01
The Large Hadron Collider written by Lyndon R. Evans and has been published by EPFL Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009-01-01 with Hadron colliders categories.
Describes the technology and engineering of the Large Hadron collider (LHC), one of the greatest scientific marvels of this young 21st century. This book traces the feat of its construction, written by the head scientists involved, placed into the context of the scientific goals and principles.