QCD Sum Rules and Soft-hard Interplay for Hadronic Form Factors PDF Download
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Languages : en
Pages :
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Author:
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Languages : en
Pages :
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Author:
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Category :
Languages : en
Pages : 14
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Book Description
The challenging problem of applicability of the perturbative QCD to exclusive processes is revealed. The basic ingredients both of the asymptotic large Q2 analysis and of the QCD sum rule approach are analyzed for the simplest and most well-studied example of the pion electromagnetic form factor. The main conclusion is that for accessible energies and momentum transfers the soft (nonperturbative) contributions dominate over those due to the hard quark rescattering subprocesses.
Author: Silvano Simula
Publisher: Springer Science & Business Media
ISBN: 3709168007
Category : Science
Languages : en
Pages : 387
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Book Description
The Workshop N* Physics and non-perturbative QeD was held at the Eu ropean Center for Theoretical Studies and Related Areas (ECT*) in Trento, Italy, during May 18-29, 1998. Previous workshops of the series on N* Physics took place at the Florida State University (1994), at CEBAF (1995), at the Institute for Nuclear Theory in Seattle (1996) and at the George Washington University (1997). The Workshop was devoted to a summary of recent experimental and the oretical research on N* phsyics and special emphasis was given to the infor mation that photo-and electro-production of nucleon resonances can provide on the non-perturbative regime of Quantum Chromodynamics. The idea was to stimulate discussions among experimentalists and theoreticians in order to pursue the interpretation of the huge amount of forthcoming data from several laboratories in the world. It was therefore decided to have both experimental and theoretical lectures on the main topics, like ,among the others, single and double pion production, TJ-and K-meson production, the GDH sum rule, the spin of the proton, etc. Thanks to the unusual two-week extension of the Work shop, the allotted time for the lectures was extended up to one hour in order to allow the invited lecturers to give a detailed presentation of their topics. Fi nally, various short contributions were selected to sharpen the discussion about selected items.
Author: A. V. Radyushkin
Publisher:
ISBN:
Category : Hadrons
Languages : en
Pages : 13
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Author: M.A. Shifman
Publisher: Elsevier
ISBN: 044459616X
Category : Science
Languages : en
Pages : 529
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Book Description
The method of the QCD sum rules was and still is one of the most productive tools in a wide range of problems associated with the hadronic phenomenology. Many heuristic ideas, computational devices, specific formulae which are useful to theorists working not only in hadronic physics, have been accumulated in this method. Some of the results and approaches which have originally been developed in connection with the QCD sum rules can be and are successfully applied in related fields, such as supersymmetric gauge theories, nontraditional schemes of quarks and leptons etc. The amount of literature on these and other more basic problems in hadronic physics has grown enormously in recent years. This volume presents a collection of papers which provide an overview of all basic elements of the sum rule approach and priority has been given to those works which seemed most useful from a pedagogical point of view.
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Languages : en
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The shape of hadronic distribution amplitudes (DAs) is a critical issue for the perturbative QCD of hard exclusive processes. Recent CLEO data on [gamma][gamma]{sup *} → [pi]° form factor clearly favor a pion DA close to the asymptotic form. The author argues that QCD sum rules for the moments of the pion DA {var_phi}{sub [pi]}(x) are unreliable, so that the humpy shape of {var_phi}{sub {pi}}(x) obtained by Chernyak and Zhitnitsky is a result of model assumptions rather than an unambiguous consequence of QCD sum rules. This conclusion is also supported by a direct QCD sum rule calculation of the [gamma][gamma]{sup *} → {pi}° form factor which gives a result very close to the CLEO data.
Author: Gastao Krein
Publisher: World Scientific
ISBN: 9814491810
Category : Science
Languages : en
Pages : 508
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Book Description
This book presents a recent survey of the advances in hadron physics. The main topics are nonperturbative high energy processes in QCD, deep inelastic scattering and perturbative QCD, RHIC and quark-gluon plasma physics and effective theories for low energy QCD.The book contains four series of lectures written in a pedagogical style and a number of short papers on the main subject. They will benefit researchers who want to be familiar with the frontiers of hadron physics and its connection with the large experimental programs under development in laboratories such as the Relativistic Heavy Ion Collider (RHIC) and the Thomas Jefferson National Laboratory.
Author: Alexander Khodjamirian
Publisher: CRC Press
ISBN: 1351392980
Category : Science
Languages : en
Pages : 313
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Book Description
This book introduces the phenomenology and theory of hadron form factors in a consistent manner, deriving step-by-step the key equations, defining the form factors from the matrix elements of hadronic transitions and deriving their symmetry relations. Explained are several general concepts of particle theory and phenomenology exemplified by hadron form factors. The main emphasis here is on learning the analytical methods in particle phenomenology. Many examples of hadronic processes involving form factors are considered, from the pion electromagnetic scattering to heavy B-meson decays. In the second part of the book, modern techniques of the form factor calculation, based on the method of sum rules in the theory of strong interactions, quantum chromodynamics, are introduced in an accessible manner. This book will be a useful guide for graduate students and early-career researchers working in the field of particle phenomenology and experiments. Features: • The first book to address the phenomenology of hadron form factors at a pedagogical level in one coherent volume • Contains up-to-date descriptions of the most important form factors of the electroweak transitions investigated in particle physics experiments
Author: Misha Shifman
Publisher: World Scientific
ISBN: 9814492221
Category : Science
Languages : en
Pages : 2196
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Book Description
This book consists of reviews covering all aspects of quantum chromodynamics as we know it today. The articles have been written by recognized experts in this field, in honor of the 75th birthday of Professor Boris Ioffe. Combining features of a handbook and a textbook, this is the most comprehensive source of information on the present status of QCD. It is intended for students as well as physicists — both theorists and experimentalists.Each review is self-contained and pedagogically structured, providing the general formulation of the problem, telling where it stands with respect to other issues and why it is interesting and important, presenting the history of the subject, qualitative insights, and so on. The first part of the book is historical in nature. It includes, among other articles, Boris Ioffe's and Yuri Orlov's memoirs on high energy physics in the 1950's, a note by B V Geshkenbein on Ioffe's career in particle physics, and an essay on the discovery of asymptotic freedom written by David Gross.
Author: M B Voloshin
Publisher: World Scientific
ISBN: 9814542741
Category : Science
Languages : en
Pages : 340
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Book Description
This workshop brought together theorists actively working in studies of QCD and general aspects of dynamics in non-Abelian gauge theories. The proceedings include papers on the current state of the theory in these areas of research, and may serve as useful review and reference material.
