Substructure Of High Pt Jets At The Lhc
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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.
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.
Qcd Resummation For High Pt Jet Shapes At Hadron Colliders
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Author : Kamel Khelifa Kerfa
language : en
Publisher:
Release Date : 2012
Qcd Resummation For High Pt Jet Shapes At Hadron Colliders written by Kamel Khelifa Kerfa 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.
Exploiting the substructure of jets observed at the LHC to better understand and interpret the experimental data has recently been a very active area of research. In this thesis we study the substructure of high-pt QCD jets, which form a background to many new physics searches. In particular, we explore in detail the perturbative distributions of a certain class of observables known as non-global jet shapes. More specifically, we identify and present state-of-the-art calculations, both at fixed-order and to all-orders in the perturbative expansion, of a set of large logarithms known as non-global logarithms. Hitherto, these logarithms have been largely mis-treated, and in many cases ignored, in the literature despite being first pointed out more than a decade ago. Our work has triggered the interest of many groups, particularly Soft and Collinear Effective Theory (SCET) groups, and led to a flurry of papers on non-global logarithms and related issues. Although our primary aim is to provide analytical results for hadron-hadron scattering environments, it is theoretically instructive to consider the simpler case of e+e- annihilation. We thus examine, in chapters 4, 5 and 6, the the said jet shapes in the latter environment and compute the full next-to-leading logarithmic resummation of the large logarithms present in the distribution for various jet definitions. We exploit the gained experience to extend our calculations to the more complex hadronic environment in chapter 7. We provide state-of-the-art resummation of the jet mass observable in vector boson + jet and dijet QCD processes at the LHC up to next-to-leading logarithmic accuracy. The resultant distribution of the former (vector boson + jet) process agrees well, after accounting for hadronisation corrections, with standard Monte Carlo event generators and potential comparisons to data from the LHC will be made soon.
Advances In Jet Substructure At The Lhc
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Author : Roman Kogler
language : en
Publisher: Springer Nature
Release Date : 2021-05-10
Advances In Jet Substructure At The Lhc written by Roman Kogler and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-05-10 with Science 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.
Jet Physics At The Lhc
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Author : Klaus Rabbertz
language : en
Publisher: Springer
Release Date : 2016-10-11
Jet Physics At The Lhc written by Klaus Rabbertz and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-10-11 with Science categories.
This book reviews the latest experimental results on jet physics from proton-proton collisons at the LHC. Jets allow to determine the strong coupling constant over a wide range of energies up the highest ones possible so far, and to constrain the gluon parton distribution of the proton, both of which are important uncertainties on theory predictions in general and for the Higgs boson in particular.A novel approach in this book is to categorize the examined quantities according to the types of absolute, ratio, or shape measurements and to explain in detail the advantages and differences. Including numerous illustrations and tables the physics message and impact of each observable is clearly elaborated.
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.
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.
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.
Towards An Understanding Of The Correlations In Jet Substructure
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Author :
language : en
Publisher:
Release Date : 2015
Towards An Understanding Of The Correlations In Jet Substructure 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.
Over the past decade, a large number of jet substructure observables have been proposed in the literature, and explored at the LHC experiments. Such observables attempt to utilize the internal structure of jets in order to distinguish those initiated by quarks, gluons, or by boosted heavy objects, such as top quarks and W bosons. This report, originating from and motivated by the BOOST2013 workshop, presents original particle-level studies that aim to improve our understanding of the relationships between jet substructure observables, their complementarity, and their dependence on the underlying jet properties, particularly the jet radius and jet transverse momentum. Lastly, this is explored in the context of quark/gluon discrimination, boosted W boson tagging and boosted top quark tagging.
Proceedings Of The Xxiv Dae Brns High Energy Physics Symposium Jatni India
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Author : Bedangadas Mohanty
language : en
Publisher: Springer Nature
Release Date : 2022-10-05
Proceedings Of The Xxiv Dae Brns High Energy Physics Symposium Jatni India written by Bedangadas Mohanty and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-10-05 with Science categories.
This book presents proceedings from the XXIV DAE-BRNS High Energy Physics (HEP) Symposium 2020, held at the National Institute of Science Education and Research, Jatni, Odisha, India. The contributions cover a variety of topics in particle physics, astroparticle physics, cosmology and related areas from both experimental and theoretical perspectives, namely (1) Standard Model Physics, (2) Beyond Standard Model Physics, (3) Relativistic Heavy-Ion Physics & QCD, (4) Neutrino Physics, (5) Particle Astrophysics & Cosmology, (6) Detector Development Future Facilities and Experiments, (7) Formal Theory, (8) Societal Applications: Medical Physics, Imaging, etc.