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Release | : 2009 |
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Download Study of Spin Sum Rules (and the Strong Coupling Constant at Large Distances). Book in PDF, ePub and Kindle
We present recent results from Jefferson Lab on sum rules related to the spin structure of the nucleon. We then discuss how the Bjorken sum rule with its connection to the Gerasimov-Drell-Hearn sum, allows us to conveniently define an effective coupling for the strong force at all distances.
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Release | : 2009 |
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Download Spin Sum Rules and the Strong Coupling Constant at Large Distance Book in PDF, ePub and Kindle
We present recent results on the Bjorken and the generalized forward spin polarizability sum rules from Jefferson Lab Hall A and CLAS experiments, focusing on the low $Q^2$ part of the measurements. We then discuss the comparison of these results with Chiral Perturbation theory calculations. In the second part of this paper, we show how the Bjorken sum rule with its connection to the Gerasimov-Drell-Hearn sum, allows us to conveniently define an effective coupling for the strong force at all distances.
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Release | : 2009 |
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Download The Strong Coupling Constant at Large Distances Book in PDF, ePub and Kindle
In this paper we discuss effective strong coupling constants. Those are well behaved in the low-$Q^2$ domain, contrarily to $\alpha_s$ from pQCD. We present an extraction of an effective strong coupling constant from Jefferson Lab polarized data at intermediate and low $Q^2$. We also show how these data, together with spin sum rules, allow us to obtain the effective coupling constant over the entire $Q^2$ range. We then discuss the relation between the experimentally extracted coupling constant and theoretical calculations at low $Q^2$. We conclude on the importance of such study for the application of the AdS/CFT correspondence to QCD.
Author | : Jian-Ping Chen |
Publisher | : AIP Conference Proceedings (Nu |
Total Pages | : 196 |
Release | : 2009-08-04 |
Genre | : Science |
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Download Spin Structure at Long Distance Book in PDF, ePub and Kindle
Theoretical developments -- Experimental developments -- Future experiments and active analyses.
Author | : C H Albright |
Publisher | : World Scientific |
Total Pages | : 1955 |
Release | : 1993-06-01 |
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ISBN | : 9814553328 |
Download Fermilab Meeting (Dpf 92), The - Proceedings Of The 7th Meeting Of The Aps Division Of Particles And Fields (In 2 Volumes) Book in PDF, ePub and Kindle
These proceedings cover the latest results in Tevatron Collider Physics, LEP results, and results from other High Energy Physics Laboratories. The volume will consist of plenary and parallel contributions on the following subjects: Heavy Quark Physics, Physics Beyond the Standard Model, Astrophysics and Non-Accelerator Physics.
Author | : Alessandra Fantoni |
Publisher | : World Scientific |
Total Pages | : 298 |
Release | : 2006 |
Genre | : Science |
ISBN | : 9812566848 |
Download Proceedings of the First Workshop on Quark-Hadron Duality and Transition to PQCD Book in PDF, ePub and Kindle
While perturbative QCD methods fully describe experimental results at high energies, and chiral perturbation theory is the low energy effective theory of the strong interactions, a form of duality is observed connecting these two regimes. In these intermediate kinematics, a wide variety of reactions are observed which can be described simultaneously by single particle (quark) scattering, and by exclusive resonance (hadron) scattering. The contributions in this proceedings volume discuss recent and existing results, and aim to foster current and future research, investigating the phenomenon of quark-hadron duality. This unique volume contains research work by scientists from different arenas of hadronic physics, dealing with different manifestations of quark-hadron duality. Contents: Introduction and Review: Experimental and Theoretical Status: Duality in the Polarized Structure Functions (H Blok); Spin Structure of the Nucleon and Aspects of Duality (Z E Meziani); Duality and Confinement: Quark Models of Duality in Electron and Neutrino Scattering (W Melnitchouk); Hadron Structure on the Back of an Envelope (A Thomas); Spin-Flavor Decomposition and Duality in Polarized SIDIS (X Jiang); Hadron Structure on the Back of an Envelope (A Thomas); Duality in Photoproduction: Duality in Vector Meson Production (A Donnachie); Onsef of Scaling in Exclusive Processes (M Mirazita); Duality in Nuclei: A Partonic Picture of Jet Fragmentation in Nuclei (X-N Wang); Quark Gluon Plasma and Hadronic Gas on the Lattice (M P Lombardo); Duality in Neutrino Experiments: Neutrinos: Local Duality and Charge Symmetry Violation (F Steffens); Duality and QCD: Higher Twist Effects in Polarized DIS (D Stamenov); Quark-Hadron Duality and High Excitations (M Shifman); Highly Excited Hadrons in QCD and Beyond (M Shifman); Future Perspectives: Transverse Polarization and Quark-Hadron Duality (O Teryaev); Research Perspectives with the Jefferson Lab (K de Jager); Perspectives with PANDA (P Gianotti); Summary Talk (P Hoyer); Transverse Polarization and Quark Gluon Duality (O Teryaev); and other papers. Readership: Researchers, academics and lecturers in high energy, particle and nuclear physics.
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Release | : 2010 |
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Download Moments of Spin Structure Functions Book in PDF, ePub and Kindle
Nucleon structure study is one of the most important research areas in modern physics and has challenged us for decades. Spin has played an essential role and often brought surprises and puzzles to the investigation of the nucleon structure and the strong interaction. New experimental data on nucleon spin structure at low to intermediate momentum transfers combined with existing high momentum transfer data offer a comprehensive picture in the strong region of the interaction and of the transition region from the strong to the asymptotic-free region. Insight for some aspects of the theory for the strong interaction, Quantum Chromodynamics (QCD), is gained by exploring lower moments of spin structure functions and their corresponding sum rules (i.e. the Bjorken, Burkhardt-Cottingham, Gerasimov-Drell-Hearn (GDH), and the generalized GDH). These moments are expressed in terms of an operator-product expansion using quark and gluon degrees of freedom at moderately large momentum transfers.
Author | : Simonetta Liuti |
Publisher | : World Scientific |
Total Pages | : 298 |
Release | : 2006-02-06 |
Genre | : Science |
ISBN | : 9814478490 |
Download Quark-hadron Duality And The Transition To Pqcd - Proceedings Of The First Workshop Book in PDF, ePub and Kindle
While perturbative QCD methods fully describe experimental results at high energies, and chiral perturbation theory is the low energy effective theory of the strong interactions, a form of duality is observed connecting these two regimes. In these intermediate kinematics, a wide variety of reactions are observed which can be described simultaneously by single particle (quark) scattering, and by exclusive resonance (hadron) scattering.The contributions in this proceedings volume discuss recent and existing results, and aim to foster current and future research, investigating the phenomenon of quark-hadron duality.This unique volume contains research work by scientists from different arenas of hadronic physics, dealing with different manifestations of quark-hadron duality.
Author | : |
Publisher | : |
Total Pages | : 950 |
Release | : 1996 |
Genre | : Chemistry |
ISBN | : |
Download Journal of Research of the National Institute of Standards and Technology Book in PDF, ePub and Kindle
Reports NIST research and development in the physical and engineering sciences in which the Institute is active. These include physics, chemistry, engineering, mathematics, and computer sciences. Emphasis on measurement methodology and the basic technology underlying standardization.
Author | : Donald G. Crabb |
Publisher | : American Inst. of Physics |
Total Pages | : 1236 |
Release | : 2009-08-25 |
Genre | : Science |
ISBN | : 9780735406865 |
Download Spin Physics Book in PDF, ePub and Kindle
The topics covered in the conference ranged from the physics that can be done with polarized beams of particles (protons, electrons, gamma-rays, etc.) to the techniques and instrumentation necessary to achieve this. Topics included: nucleon structure measurements (from where does the spin of the proton and neutron come), the acceleration, storage and polarization of particle beams and the polarized targets and sources necessary for mounting the experiments.