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The Structure of Jets at Hadron Colliders

2012
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Release : 2012
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Book Synopsis The Structure of Jets at Hadron Colliders by : Andrew James Larkoski

Download or read book The Structure of Jets at Hadron Colliders written by Andrew James Larkoski. This book was released on 2012. Available in PDF, EPUB and Kindle. Book excerpt: 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.

The Structure of Jets at Hadron Colliders

2012
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Release : 2012
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Kind : eBook
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Book Synopsis The Structure of Jets at Hadron Colliders by :

Download or read book The Structure of Jets at Hadron Colliders written by . This book was released on 2012. Available in PDF, EPUB and Kindle. Book excerpt: Particle physics seeks to understand the interactions and properties of the fundamental particles. To gain understanding, there is an interplay between theory and experiment. Models are proposed to explain how particles behave and interact. These models make precise predictions that can be tested. Experiments are built and executed to measure the properties of these particles, providing necessary tests for the theories that attempt to explain the realm of fundamental particles. However, there is also another level of interaction between theory and experiment; the development of new experiments demands the study of how particles will behave with respect to the measured observables toward the goal of understanding the details and idiosyncrasies of the measurements very well. Only once these are well-modeled and understood can one be con dent that the data that are measured is trustworthy. The modeling and interpretation of the physics of a proton collider, such as the LHC, is the main topic of this thesis.

Jet Shapes in Hadron and Electron Colliders

1993
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Release : 1993
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Book Synopsis Jet Shapes in Hadron and Electron Colliders by :

Download or read book Jet Shapes in Hadron and Electron Colliders written by . This book was released on 1993. Available in PDF, EPUB and Kindle. Book excerpt: High energy jets are observed both in hadronic machines like the Tevatron and electron machines like LEP. These jets have an extended structure in phase space which can be measured. This distribution is usually called the jet shape. There is an intrinsic relation between jet variables, like energy and direction, the jet algorithm used, and the jet shape. Jet shape differences can be used to separate quark and gluon jets.

Statistical Aspects of Jets Containing Heavy Quarks

2023
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Release : 2023
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Book Synopsis Statistical Aspects of Jets Containing Heavy Quarks by : Jared Denali Reiten

Download or read book Statistical Aspects of Jets Containing Heavy Quarks written by Jared Denali Reiten. This book was released on 2023. Available in PDF, EPUB and Kindle. Book excerpt: Jets comprise a rich class of emergent phenomena stemming the underlying theory of the strong nuclear force, Quantum Chromodynamics. As jets are produced in copious quantities in hadron colliders, understanding their internal structure and evolution is of the utmost importance for modern particle physics. In this thesis, we study various aspects of a special class of jets---that is, jets containing heavy quarks, such as charm, bottom and top---which can all be understood from a statistical point of view. In the first part, we consider situations in which the observation of back-to-back heavy-quark dijet pairs shed light on key physics governing the final and initial states of high-energy particle collisions---from the modification of dijet mass spectra by the quark-gluon plasma created in the collisions of heavy ions to the probing of the Sivers spin asymmetry in deep inelastic scattering. In the second part, we analyze the internal landscapes of jets initiated by heavy quarks and demonstrate how the so-called ``dead-cone'' effect manifests in the cumulants of jet substructure distributions. In the third and final part, we adapt concepts from the machine learning community to tag top jets from a background of jets initiated by light quarks and gluons as well develop a novel data type that is particularly well-suited to exposing the characteristic angular structure of top decay products.

Looking Inside Jets

2019-05-11 Science
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Release : 2019-05-11
Genre : Science
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Book Rating : 091/5 ( reviews)

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Book Synopsis Looking Inside Jets by : Simone Marzani

Download or read book Looking Inside Jets written by Simone Marzani. This book was released on 2019-05-11. Available in PDF, EPUB and Kindle. Book excerpt: 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.

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