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Very High Multiplicity Physics Workshops

Very High Multiplicity Physics Workshops
Author: Aleksey Sissakian
Publisher: World Scientific
Total Pages: 194
Release: 2008
Genre: Science
ISBN: 981283494X

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This proceedings volume provides a comprehensive overview of the selected reports given at the International Workshops on Very High Multiplicity Physics from 2000 through 2007. These include results of original investigations dedicated to very high multiplicity processes, collective phenomena in quark gluon plasma, correlator analyses, polarization effects, and pion gas condensation, among others. The greater part of the material is devoted to basic technical aspects of the NICA/MPD project. Essential attention is paid to predictions of the multiperipheral model, perturbative QCD, physics of small x, and fractal analysis and statistical physics approaches to multiple production.The book is an important reference for physicists working in elementary particle physics. It is also a suitable read for undergraduate students.


Looking Inside Jets

Looking Inside Jets
Author: Simone Marzani
Publisher: Springer
Total Pages: 205
Release: 2019-05-11
Genre: Science
ISBN: 3030157091

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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.


Very High Multiplicity Physics Workshops

Very High Multiplicity Physics Workshops
Author: A. N. Sisakian
Publisher: World Scientific
Total Pages: 194
Release: 2008
Genre: Science
ISBN: 9812834958

Download Very High Multiplicity Physics Workshops Book in PDF, ePub and Kindle

This proceedings volume provides a comprehensive overview of the selected reports given at the International Workshops on Very High Multiplicity Physics from 2000 through 2007. These include results of original investigations dedicated to very high multiplicity processes, collective phenomena in quark gluon plasma, correlator analyses, polarization effects, and pion gas condensation, among others. The greater part of the material is devoted to basic technical aspects of the NICA/MPD project. Essential attention is paid to predictions of the multiperipheral model, perturbative QCD, physics of small x, and fractal analysis and statistical physics approaches to multiple production.The book is an important reference for physicists working in elementary particle physics. It is also a suitable read for undergraduate students.


Energy Research Abstracts

Energy Research Abstracts
Author:
Publisher:
Total Pages: 444
Release: 1994
Genre: Power resources
ISBN:

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Quark Model and High Energy Collisions

Quark Model and High Energy Collisions
Author: Vladimir Vladislavovich Anisovich
Publisher: World Scientific
Total Pages: 547
Release: 2004
Genre: Science
ISBN: 9812794921

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This is an updated version of the book published in 1985. QCD-motivated, it gives a detailed description of hadron structure and soft interactions in the additive quark model, where hadrons are regarded as composite systems of dressed quarks. In the past decade it has become clear that nonperturbative QCD, responsible for soft hadronic processes, may differ rather drastically from perturbative QCD. The understanding of nonperturbative QCD requires a detailed investigation of the experiments and the theoretical approaches. Bearing this in mind, the book has been rewritten paying special attention to the interplay of soft hadronic collisions and the quark model. It is at the crossroads of these domains that peculiar features of strong QCD reveal themselves. The book discusses constituent quarks, diquarks, the massive effective gluons and the problem of scalar isoscalar mesons. The quark-gluonium classification of meson states is also given. Experimentally observed properties of hadrons are presented together with the corresponding theoretical interpretation in the framework of the composite hadron structure. The text includes a large theoretical part, which shows how to treat composite systems (including relativistic ones) with a technique based on spectral integration. This technique provides the possibility of handling hadrons as weakly bound systems of quarks and, at the same time, takes into account confinement. Attention is focused on the composite structure revealing itself in high energy hadron collisions. Fields of applicability of the additive quark model are discussed, as is colour screening in hadronic collisions at high and superhigh energies. Along with a detailed presentation of hadronOCohadron collisions, a description of hadronOConucleus collisions is given. Sample Chapter(s). Chapter 1: Introduction (1,047 KB). Contents: High Energy Hadron Interactions; Composite Systems; High Energy Interactions of Composite Systems; Hadron Zoology and Static Features of Hadrons; Binary Processes in the Quark Model; Multiparticle Production in the Quark Model: Hadron Collisions at Moderately High Energies; HadronOCoNucleus Collisions. Readership: Graduate students and researchers in particle and nuclear physics."


Jet Production Rates in Association with W and Z Bosons in Pp Collisions at $ \sqrt {s}

Jet Production Rates in Association with W and Z Bosons in Pp Collisions at $ \sqrt {s}
Author:
Publisher:
Total Pages:
Release: 2012
Genre:
ISBN:

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Measurements of jet production rates in association with W and Z bosons for jet transverse momenta above 30 GeV are reported, using a sample of proton-proton collision events recorded by CMS at sqrt(s) = 7 TeV, corresponding to an integrated luminosity of 36 inverse picobarns. The study includes the measurement of the normalized inclusive rates of jets sigma(V +>= n jets)/sigma(V), where V represents either a W or a Z. In addition, the ratio of W to Z cross sections and the W charge asymmetry as a function of the number of associated jets are measured. A test of Berends--Giele scaling at sqrt(s) = 7 TeV is also presented. The measurements provide a stringent test of perturbative-QCD calculations and are sensitive to the possible presence of new physics. The results are in agreement with the predictions of a simulation that uses explicit matrix element calculations for final states with jets.