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New Results On Testing Duality In Spin Structure From Jefferson Lab
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Book Synopsis New Results on Testing Duality in Spin Structure from Jefferson Lab by : Nilanga Liyanage
Download or read book New Results on Testing Duality in Spin Structure from Jefferson Lab written by Nilanga Liyanage and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Bloom-Gilman duality has been experimentally demonstrated for spin independent structure functions. Duality is observed when the smooth scaling curve at high momentum transfer is an average over the resonance bumps at lower momentum transfer, but at the same value of scaling variable x. Signs of quark-hadron duality for the spin Dependant structure function g1 of the proton has been recently reported by the Hermes collaboration. Experimental Halls A, B and C at Jefferson lab have recently measured spin structure functions in the resonance region for the proton and the neutron. Data from these experiments combined with Deep-Inelastic-Scattering data provide a precision test of quark-hadron duality predictions for spin structure functions for both the proton and the neutron. This will be one of the first precision tests of spin and flavor dependence of quark-hadron duality.
Book Synopsis Tests of Duality in the Spin-Structure Function G_1 by : Wolfgang Korsch
Download or read book Tests of Duality in the Spin-Structure Function G_1 written by Wolfgang Korsch and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Although quark-hadron duality is well established for the spin-independent structure function, F{sub 2}{sup p}, hardly any information is available on the low Q{sup 2} scaling behavior of spin-structure functions. Recent experiments at Jefferson Lab measured the spin-structure function g1 in the nucleon resonance region for variety of targets. Global and local duality was observed for Q{sup 2} values above {approx} 2 (GeV/c){sup 2}.
Book Synopsis Spin Physics With Clas At Jefferson Laboratory by :
Download or read book Spin Physics With Clas At Jefferson Laboratory written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Inelastic scattering using polarized nucleon targets and polarized charged lepton beams allows the extraction of spin structure functions that provide information about the spin structure of the nucleon. A program designed to study such processes at low and intermediate Q2 for the proton and deuteron has been pursued by the CLAS Collaboration at Jefferson Lab since 1998. The data with high statistical precision and extensive kinematic coverage allows us to better constrain the polarized parton distributions and to accurately determine various moments of g1 as a function of Q2. The latest results are presented, illustrating our contribution to the world data, with comparisons of the data with NLO global fits, phenomenological models, chiral perturbation theory, the GDH and Bjorken sum rules, and tests of global duality.
Book Synopsis Deep Inelastic Scattering by : Wesley H. Smith
Download or read book Deep Inelastic Scattering written by Wesley H. Smith and published by American Institute of Physics. This book was released on 2005-10-20 with total page 1132 pages. Available in PDF, EPUB and Kindle. Book excerpt: DIS 2005 is the 13th in a series of annual workshops on Deep Inelastic Scattering (DIS) and Quantum Chromodynamics (QCD). The aim of these workshops is to review the progress in the field of DIS and QCD and to discuss and lay the groundwork for the future. DIS 2005 brought together 280 experimentalists and theorists to discuss the latest theoretical developments and new experimental results from HERA, TeVatron, SLAC, CERN, RHIC and Jefferson Lab.
Book Synopsis Exclusive Processes at High Momentum Transfer by : A. V. Radyushkin
Download or read book Exclusive Processes at High Momentum Transfer written by A. V. Radyushkin and published by World Scientific. This book was released on 2002 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on the physics of exclusive processes at high momentum transfer and their description in terms of generalized parton distributions, perturbative QCD, and relativistic quark models. It covers recent developments in the field, both theoretical and experimental. Contents: Perspectives on Exclusive Processes in QCD (S J Brodsky); High-t Meson Photo- and Electroproduction: A Window on Partonic Structure of Hadrons (J-M Laget); Nucleon Hologram with Exclusive Leptoproduction (A Belitsky & D Muller); QCD Factorization for the Pion Diffractive Dissociation into Two Jets (D Yu Ivanov); GPDs, Form Factors and Compton Scattering (P Kroll); Real Compton Scattering from the Proton (A Nathan); Resonance Exchange Contributions to Wide-Angle Compton Scattering: The D-Term (T Oppermann); Proton-Antiproton Annihilation into Two Photons at Large s (C Weiss); Quark--Hadron Duality Studies at Jefferson Lab; An Overview of New and Exisiting Results (C Keppel); Novel Hard Semiexclusive Processes and Color Singlet Clusters in Hadrons (M Strikman et al.); and other papers. Readership: Theoretical and experimental researchers in nuclear and elementary particle physics.
Book Synopsis Spin Sum Rules and Polarizabilities by : Jian-Ping Chen
Download or read book Spin Sum Rules and Polarizabilities written by Jian-Ping Chen and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The nucleon spin structure has been an active, exciting and intriguing subject of interest for the last three decades. Recent experimental data on nucleon spin structure at low to intermediate momentum transfers provide new information in the confinement regime and the transition region from the confinement regime to the asymptotic freedom regime. New insight is gained by exploring moments of spin structure functions and their corresponding sum rules (i.e. the generalized Gerasimov-Drell-Hearn, Burkhardt-Cottingham and Bjorken). The Burkhardt-Cottingham sum rule is verified to good accuracy. The spin structure moments data are compared with Chiral Perturbation Theory calculations at low momentum transfers. It is found that chiral perturbation calculations agree reasonably well with the first moment of the spin structure function g{sub 1} at momentum transfer of 0.05 to 0.1 GeV{sup 2} but fail to reproduce the neutron data in the case of the generalized polarizability {delta}{sub LT} (the {delta}{sub LT} puzzle). New data have been taken on the neutron ({sup 3}He), the proton and the deuteron at very low Q{sup 2} down to 0.02 GeV{sup 2}. They will provide benchmark tests of Chiral dynamics in the kinematic region where the Chiral Perturbation theory is expected to work.
Book Synopsis Quark-hadron Duality And The Transition To Pqcd - Proceedings Of The First Workshop by : Simonetta Liuti
Download or read book Quark-hadron Duality And The Transition To Pqcd - Proceedings Of The First Workshop written by Simonetta Liuti and published by World Scientific. This book was released on 2006-02-06 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Jefferson Lab's Results on the Q2-evolution of Moments of Spin Structure Functions by :
Download or read book Jefferson Lab's Results on the Q2-evolution of Moments of Spin Structure Functions written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present the recent JLab measurements on moments of spin structure functions at intermediate and low Q2. The Bjorken sum and Burkhardt-Cottingham sum on the neutron are presented. The later appears to hold. Higher moments (generalized spin polarizabilities and d2(superscript n)) are shown and compared to chiral perturbation theory and lattice QCD respectively.
Book Synopsis Spin Structure at Long Distance by : Jian-Ping Chen
Download or read book Spin Structure at Long Distance written by Jian-Ping Chen and published by AIP Conference Proceedings (Nu. This book was released on 2009-08-04 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: Theoretical developments -- Experimental developments -- Future experiments and active analyses.
Download or read book NSTAR 2001 written by D. Drechsel and published by World Scientific. This book was released on 2001 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt: Positive pion photoproduction and compton scattering at GRAAL / V. Kouznetsov for the GRAAL collaboration -- Virtual compton scattering and pion electroproduction in the nucleon resonance region / G. Laveissiere for the Jefferson Lab Hall A collaboration -- Single spin beam asymmetry measurements from single [symbol] electroproduction in the [symbol](1232) resonance region / K. Joo -- The new crystal ball experimental program / W. J. Briscoe -- Observation of [symbol]-mesic nuclei in photoreactions: Results and perspectives / G. A. Sokol, A. I. L'vov, L. N. Pavlyuchenko -- Baryon spectroscopy: Experiments at PNPI / I. Lopatin -- Measurement of the cross section asymmetry in deuteron photodisintegration by linearly polarized photons in the energy range E[symbol] = 0.8 - 1.6 GeV / A. Sirunian ... [et al.] -- Nucleon resonances in lattice QCD / F. X. Lee -- Lattice study of nucleon properties with domain wall fermions / S. Sasaki -- Quark-hadron duality: Resonances and the onset of scaling / W. Melnitchouk -- Generalized GDH sum rule and spin-dependent electroproduction in the resonance region / J. P. Chen for the Jefferson Lab E94-010 collaboration -- Double polarization measurements using the CLAS at JLab / R. C. Minehart for the CLAS collaboration -- The helicity dependent excitation spectrum of the nucleon and the GDH sum rule / A. Thomas for the GDH- and A2-collaborations -- Static magnetic moment of the [symbol](1232) / M. Kotulla for the TAPS and AS collaborations -- Meson photoproduction at GRAAL / A. D'Angelo ... [et al.] -- Maximum likelihood techniques for PWA of 2-pion photoproduction / J. P. Cummings -- [symbol] electroproduction with CLAS / J. A. Mueller -- Kaon electroproduction and [symbol] polarization observables measured with CLAS / B. Raue for the CLAS collaboration -- Recent results on kaon photoproduction at SAPHIR in the reactions [symbols] and [symbols] / K.-H. Glander for the SAPHIR collaboration -- Vector meson decay of baryon resonances / U. Mosel, M. Post -- Higher and missing resonances in [symbol] photoproduction / Y. Oh, A. I. Titov, T.-S. H. Lee -- Photoproduction of baryon resonances, first data from the CB-ELSA experiment / U. Thoma for the CB-ELSA collaboration -- Laser-electron photon project at SPring-8 / T. Nakano -- The baryon resonance program at BES / B.S. Zou for the BES collaboration -- Flavor symmetry studies with new hyperon data from the crystal ball / B. M. K. Nefkens ... [et al.] for the Crystal Ball collaboration -- Higher resonances and the example of two pion electroproduction with the CLAS detector at Jefferson Lab / M. Ripani for the CLAS collaboration -- Nucleon resonances and mesons in nuclei / V. Metag -- Excitation of nucleon resonances / V. D. Burkert -- Summary of the partial wave analysis group of BRAG: Multipole analysis of a benchmark data set for pion photoproduction / R. A. Arndt ... [et al.].
Book Synopsis Proceedings of the First Workshop on Quark-Hadron Duality and Transition to PQCD by : Alessandra Fantoni
Download or read book Proceedings of the First Workshop on Quark-Hadron Duality and Transition to PQCD written by Alessandra Fantoni and published by World Scientific. This book was released on 2006 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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. Sample Chapter(s). Chapter 1: Introductory Remarks on Duality in Lepton-Hadron Scattering (490 KB). Contents: Introduction and Review: Experimental and Theoretical Status: Duality in the Polarized Structure Functions (H P 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 W Thomas et al.); Spin-Flavor Decomposition and in Polarized Semi-Inclusive Deep Inelastic Scattering Experiments at Jefferson Lab (X Jiang); Duality in Photoproduction: Duality in Vector-Meson Production (A Donnachie); Onset 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 and Local Duality (F Steffens & K Tsushima); Duality and QCD: Higher Twist Effects in Polarized DIS (E Leader et al.); Highly Excited Hadrons in QCD and Beyond (M Shifman); Future Perspectives: Transverse Polarization and Quark-Hadron Duality (O V Teryaev); Research Perspectives with the Jefferson Lab (K de Jager); Perspectives with PANDA (P Gianotti); Summary Talk (P Hoyer); and other papers. Readership: Researchers, academics and lecturers in high energy, particle and nuclear physics.
Book Synopsis Spin 2004 - Proceedings Of The 16th International Spin Physics Symposium And Workshop On Polarized Electron Sources And Polarimeters (With Cd-rom) by : Franco Bradamante
Download or read book Spin 2004 - Proceedings Of The 16th International Spin Physics Symposium And Workshop On Polarized Electron Sources And Polarimeters (With Cd-rom) written by Franco Bradamante and published by World Scientific. This book was released on 2005-08-02 with total page 1065 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive volume covers the most recent advances in the field of spin physics, including the latest research in high energy and nuclear physics and the study of nuclear spin structure. The comprehensive coverage also includes polarized proton and electron acceleration and storage as well as polarized ion sources and targets. Many significant new results and achievements on the different topics considered at the symposium are presented in this book for the first time.
Book Synopsis DIFFRACTION 2002: Interpretation of the New Diffractive Phenomena in Quantum Chromodynamics and in the S-Matrix Theory by : R. Fiore
Download or read book DIFFRACTION 2002: Interpretation of the New Diffractive Phenomena in Quantum Chromodynamics and in the S-Matrix Theory written by R. Fiore and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the NATO Advanced Research Workshop, Alushta, Crimea, Ukraine, from 31 August to 6 September 2002
Book Synopsis Testing QCD Through Spin Observables in Nuclear Targets by : Don G. Crabb
Download or read book Testing QCD Through Spin Observables in Nuclear Targets written by Don G. Crabb and published by World Scientific. This book was released on 2003 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains the invited talks and contributed papers presented at the workshop on ?Testing QCD Through Spin Observables in Nuclear Targets?, held at the University of Virginia in April 2002.The workshop was proposed in the context of the large number of experiments that have used polarized deuterons or polarized 3He to extract information about the spin parameters of the neutron. The motivation for this workshop was to study the effects of the nuclear medium on the spin properties of the bound nucleon and to explore issues in QCD that might be resolved through spin observables in nuclear targets: What is the effect of the nuclear medium on the measured asymmetries? How have the latest results on the spin structure of the nucleon and the nucleon form factors changed our thinking? What advances are anticipated in the development of polarized targets?
Book Synopsis Spin Physics Results from Jefferson Lab Hall B and Hall C. by : M. Khandaker
Download or read book Spin Physics Results from Jefferson Lab Hall B and Hall C. written by M. Khandaker and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The spin physics program in Jefferson Lab's Hall B and Hall C concentrates on precision studies of the nucleon spin structure functions that can be extracted with inclusive and exclusive polarized scattering experiments in and above the resonance region at low to moderate Q{sup 2}. Results on proton and deuteron spin asymmetries, Lambda{sub 1} (W, Q{sup 2}) and Lambda{sub 2} (W, Q{sup 2}) from the Resonances' Spin Structure--RSS experiment in Hall C and the spin structure function g{sub 1} (x, Q{sup 2}) and its first moment Gamma{sub 1}(Q{sup 2}) from the CLAS EG1 Program in Hall B are presented.
Book Synopsis An Overview of Longitudinal Spin Structure Measurements from JLab by :
Download or read book An Overview of Longitudinal Spin Structure Measurements from JLab written by and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Jefferson Lab is currently one of the facilities leading the investigation of the spin structure of the nucleon. Over the past 15 years, several high precision measurements have been completed, extending our knowledge of the polarized structure functions g1 and g2 down to Q2 = 0.02 GeV2. In particular, the low-Q2 range (≤ 0.1 GeV2) from these data allows us to make a benchmark-check of Chiral Perturbation theory ([chi]PT). Previous results for the moments of the spin structure functions in this region have shown mixed agreement. For [Gamma]1, the first moment of g1, we find good consistency between data and theory. However, we have seen a surprisingly large discrepancy with [chi]PT calculations for the [delta]{sub LT} spin polarizability on the neutron, which is significantly less sensitive to the [Delta]-resonance contribution. These proceedings will discuss the recent experimental effort at low Q2 from Jefferson Lab, including a discussion of preliminary results on the neutron. The new results on the neutron still show a sizeable discrepancy between data and theory. However, new calculations show improved agreement with data for some observables. In addition, new proton data for g2 is also expected to help resolve the disagreement for [delta]{sub LT}.
Book Synopsis Study of Double Spin Asymmetries in Inclusive Ep Scattering at Jefferson Lab by :
Download or read book Study of Double Spin Asymmetries in Inclusive Ep Scattering at Jefferson Lab written by and published by . This book was released on 2014 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt: The spin structure of the proton has been investigated in the high Bjorken x and low momentum transfer Q2 region. We used Jefferson Lab's polarized electron beam, a polarized target, and a spectrometer to get both the parallel and perpendicular spin asymmetries Apar and Aperp. These asymmetries produced the physics asymmetries A_1 and A_2 and spin structure functions g_1 and g_2. We found Q2 dependences of the asymmetries at resonance region and higher-twist effects. Our result increases the available data on the proton spin structure, especially at resonance region with low Q2. Moreover, A_2 and g_2 data show clear Q2 evolution, comparing with RSS and SANE-BETA. Negative resonance in A_2 data needs to be examined by theory. It can be an indication of very negative transverse-longitudinal interference contribution at W ̃1.3 GeV. Higher twist effect appears at the low Q2 of 1.9 GeV2, although it is less significant than lower Q2 data of RSS. Twist03 matrix element d_2 was calculated using our asymmetry fits evaluation at Q2 – 1.9 GeV2. D-bar_2 = -0.0087±0.0014 was obtained by integrating 0.47 ≤ x ≤ 0.87.
