NSTAR 2001 Proceedings of the Workshop on The Physics of Excited Nucleons pot

Organization

Foreword

CONTENTS

Nucleon Resonances in the Quark Model

1 Introduction
2 Effective Degrees of Freedom
3 Confining Interaction
4 Residual Interactions
5 Lattice Results
6 Hybrid Baryons
7 Effects of Decay Channel Couplings
8 Describing Reactions Using the Quark Model
9 Summary
Acknowledgments
References

Quadrupole Strength in the N -> A Transition

1 Introduction
2 Theoretical Developments
3 The Bates y* N -> A Program
4 Future Prospects and Acknowledgments
References

Pion Electroproduction at ELSA

1 Introduction
2 Neutron Identification
3 First Results
References

TT0 Electroproduction in the A(1232) Region at MAMI

1 Introduction
2 Results of the p(e e'p)TT0 Experiment
3 Forward and Backward LT-Asymmetry in p(e e'p)TT0
4 Fifth Structure Function in p(e e'p)TT0
5 Summary
Acknowledgements
References

Pion Electroproduction Using CLAS

1 Introduction
References

Recoil Polarization Measurements in TT0 Electroproduction at the Peak of the A(1232)

1 Introduction
2 Measurement Philosophy: Exploiting Hall A's Tools
3 Specific Measurements for E91-011
4 Accessible Responses and Expected Sensitivity to S1+.
5 Data Analysis - Sample Spectra
6 Conclusions/Outlook
Acknowledgments
References

Chiral Effective Field Theories with Explicit Spin 3/2 Degrees of Freedom - A Status Report

1 Introduction
2 Chiral Calculations and Power Counting
3 Anomalous Magnetic Moments of the Nucleon
4 Isovector Form Factors of the Nucleon
5 Isovector Nucleon-Delta Transition Form Factors
6 Summary
Acknowledgments
References

Dynamical Meson-Baryon Resonances with Chiral Lagrangians

1 Introduction
2 Meson-Baryon Scattering in Coupled Channels
3 Strangeness S = -1 Sector
4 Strangeness S = 0 Sector
5 Strangeness S = -2 Sector
6 Conclusions
Acknowledgments
References

Chiral Lagrangians with Resonances

1 Chiral Symmetry
2 Elastic TTN Scattering and Unitarization
3 Coupled Channel NK Scattering
4 Conclusions
Acknowledgments
References

Pion Photo- and Electroproduction in Dynamical Model

1 Introduction
2 Effective Hamiltonian and Electromagnetic Current
3 Pion Photoproduction and Electroproduction
4 Summary
Acknowledgments
References

Recent Developments in the Dynamical and Unitary Isobar Models for Pion Electromagnetic Production

1 Introduction
2 Formalism
3 Pion Photo- and Electroproduction in the A(1232) Region
4 Threshold TT0 Photoproduction
5 Threshold TT0 Electroproduction
6 Conclusion
References

Two Pion Production in the Jiilich Model

1 Introduction
2 The Model
3 Results
4 Summary
Acknowledgments
References

Update on Partial-Wave Analysis

1 Overview
2 Near-Threshold Studies
3 Fitting the Full Resonance Region
4 Conclusions and Further Questions
Acknowledgments
References

Nucleon Resonance Properties in Multichannel Approaches

1 Introduction
2 Coupled-channels Analyses
3 Results and Discussion
4 Conclusions and Outlook
Acknowledgments
References

Variation of Hadron Structure with Quark Mass

1 Introduction
2 Electromagnetic Form Factors
3 Structure Functions
Acknowledgments
References

The Role of the Pion in Nucleon Resonance Structure

1 Pion Coupling to Constituent Quarks
2 Model Calculations of Resonance Decay Widths
3 Pion Decays of D-Mesons
4 Conclusion
Acknowledgments
References

Relativistic Quark Models

1 Introduction
2 Relativistic Constituent Quark Models
3 Nucleon Elastic Form Factors and the N - P11(1440) Transition
4 Conclusions
References

Generalized Polarizabilities in a Constituent Quark Model

1 Introduction
2 Compton Tensor and Low-Energy Theorem
3 Generalized Polarizabilities and their Interpretation
4 Compton Tensor in a Nonrelativistic Framework
5 Generalized Polarizabilities in a Constituent Quark Model
6 Results
7 Summary
Acknowledgments
References

Nucleon Properties in the Perturbative Chiral Quark Model

1 Introduction
2 Perturbative Chiral Quark Model
3 Results
Acknowledgments
References

The Glasgow Pion Photoproduction Partial Wave Analysis 2001

1 Introduction
2 The Analysis
3 Results
4 Conclusions
References

Residues of the Multipole Amplitudes M3/2 1+ E3/2 1+ at the t-Matrix Pole Found in the Framework of Dispersion Relations

1 Introduction
2 Reducing of Dispersion Relations for M3/2 1+ E3/2 1+ to Integral Equations and the Solution of these Equations
References

An Isobar Model for n Photo- and Electroproduction on the Nucleon

1 Introduction
2 Isobar Model
Acknowledgments
References

Detailed Analysis of n Production in Proton-Proton Collisions

References

Phenomenological Analysis of N* Excitation in Charged Double Pion Production

1 Introduction
2 Model Description
3 Real Photon
4 Virtual Photons
References

Results on A(1232) Resonance Parameters: A New TTN Partial Wave Analysis

1 Determination of Resonance Parameters from Speed Plots
2 The Background in the P33 Partial Wave
3 An Updated Version of the KH80 Partial Wave Analysis
Acknowledgments
References

Solving the Puzzle of the yp -> TT+TT0n Reaction

1 Introduction
2 Formalism
3 Discussion and Results
4 Summary
References

The Giessen Model - Vector Meson Production on the Nucleon in a Coupled Channel Approach

1 Introduction
2 The Model
3 Results on (Pseudo)scalar Meson Production
4 Vector Meson Production
5 Outlook
6 Acknowledgments
References

Multipole Analysis for Pion Photoproduction with MAID and a Dynamical Model

References

Model Dependence of E2/M1

1 Introduction
2 The Participants and their Models
3 Results
Acknowledgments
References

Eta Photoproduction in a Coupled-Channels Approach

1 Introduction
2 Low-Energy Region: S11(1535) and D13(1520)
3 Intermediate-Energy Region: S11(1650) and D13(1700)
Acknowledgments
References

Electroweak Properties of Baryons in a Covariant Chiral Quark Model

References

Low Lying qqqqq States in the Baryon Spectrum

1 Introduction
2 The qqqqq System
3 Summary
References

Parity Doublets from a Relativistic Quark Model

References

A Dispersion Theoretical Approach to Virtual Compton Scattering off the Proton

References

Neutron Charge Form Factor and Quadrupole Deformation of the Nucleon

References

The Ground and Radial Excited States of the Nucleon in a Relativistic Schodinger-Type Model

References

Vector Meson Photoproduction in the Quark Model

1 Introduction
2 Analysis
Acknowledgments
References

Status of Nucleon Resonances with Masses M < MN + MTT

References

Spin Structure of the A(1232) and Inelastic Compton Scattering

1 Introduction: The GDH Sum Rule for the A(1232)
2 Photocouplings in NQM: The Role of Spin-Orbit Corrections
3 Differential Cross Section of yN -> yA
References

Structure of the Roper Resonance from a-Proton and TT-Nucleon Scattering

1 Introduction
2 T-Matrix Description of TT-N and a-p Scattering
3 Comparison with y-N
References

Structure of the Nucleon Investigated by Compton Scattering

References

Virtual Compton Scattering at Jefferson Lab: Preliminary Results in the Polarizability Domain at Q2 = 1 and 1.9 GeV2

1 Virtual Compton Scattering
2 Virtual Compton Scattering at Jefferson Laboratory.
3 Preliminary Results for Cross Sections
References

Measurement of the Cross Section Asymmetry E for yp -> TT0p over the Range Ey = 0.5 - 1.1 GeV

1 Introduction
2 Experiment and Data Analysis
Acknowledgments
References

Positive Pion Photoproduction and Compton Scattering at GRAAL

References

Virtual Compton Scattering and Pion Electroproduction in the Nucleon Resonance Region

1 Introduction
2 Experimental Considerations
3 Pion Electroproduction
4 Virtual Compton Scattering (VCS)
5 Conclusion
References

Single Spin Beam Asymmetry Measurements from Single TT0 Electroproduction in the A(1232) Resonance Region

1 Introduction
2 Data Analysis and Results
References

The New Crystal Ball Experimental Program

1 Introduction
2 Experimental Considerations
3 Results
4 Acknowledgments

Observation of n-Mesic Nuclei in Photoreactions: Results and Perspectives

Acknowledgment
References

Baryon Spectroscopy: Experiments at PNPI

1 Study of TT-p Charge Exchange Scattering in the Region of Low-Lying Pion-Nucleon Resonances
2 Measurement of the Spin Rotation Parameters for TT+p Elastic Scattering in the Second Resonance Region
References

Measurement of the Cross Section Asymmetry in Deuteron Photodisintegration by Linearly Polarized Photons in the Energy Range Er = 0.8 - 1.6 GeV

1 Introduction
2 Experimental Setup
3 Results and Summary
References

Nucleon Resonances in Lattice QCD

1 Introduction
2 Method
4 Conclusion
5 Acknowledgment
References

Lattice Study of Nucleon Properties with Domain Wall Fermions

1 Introduction
2 Nucleon Excited States
3 Nucleon Matrix Elements
4 Conclusions
Acknowledgments
References

Quark-Hadron Duality: Resonances and the Onset of Scaling

1 Introduction
2 Bloom-Gilman Duality
3 Understanding the Origin of Duality
4 Applications of Local Duality
5 Conclusion
References

Generalized GDH Sum Rule and Spin-Dependent Electroproduction in the Resonance Region

1 Introduction
2 Generalized GDH Sum Rules
3 JLab E94-010 Experiment
4 GDH with Nearly Real Photons: JLab E97-110
5 Outlook and Summary
Acknowledgments
References

Double Polarization Measurements Using the CLAS at JLab

1 Motivation and Theoretical Description
2 Description of the Experiment
3 Data Analysis and Results
Acknowledgments
References

The Helicity Dependent Excitation Spectrum of the Nucleon and the GDH Sum Rule

1 Experimental Setup
2 Results
Acknowledgments
References

Static Magnetic Moment of the A(1232)

1 Introduction
2 Experimental Setup and Analysis Methods
3 Preliminary Results and Conclusion
Acknowledgments
References

Meson Photoproduction at GRAAL

1 Introduction
2 The Graal Experimental Set-up
3 n Photoproduction
4 TT0 Photoproduction
5 K+ A Photoproduction
6 Acknowledgments
References

Maximum Likelihood Techniques for PWA of 2-Pion Photoproduction

1 Introduction
2 Analysis Technique
3 Preliminary Tests
4 Conclusion
References

n Electroproduction with CLAS

1 Introduction
2 Results from First Data Run
3 Prospects and Conclusions
4 Acknowledgements
References

Kaon Electroproduction and A Polarization Observables Measured with CLAS

1 Introduction
2 Formalism and Kinematics
3 The CLAS Program
4 Results
5 Summary
Acknowledgments
References

Recent Results on Kaon Photoproduction at SAPHIR in the Reactions rp -> K+A and rp ->K+ E0

1 Introduction
2 Cross Sections
References

Vector Meson Decay of Baryon Resonances

1 Introduction
2 VMD Analysis of the Electromagnetic Resonance Decay
3 The p Meson
4 The w Meson
5 Conclusions
6 Acknowledgments
References

Higher and Missing Resonances in w Photoproduction

Acknowledgments
References

Photoproduction of Baryon Resonances First Data from the CB-ELSA Experiment

1 Introduction
2 The CB-ELSA Detector
3 First Data
4 Conclusions
References

Laser-Electron Photon Project at SPring-8

1 Physics Motivation
2 LEPS Facility
3 Detector
4 Results and Prospects
References

The Baryon Resonance Program at BES

1 Physics motivation
2 Data Status
3 Partial Wave Analyses
4 Future Prospects
Acknowledgments
References

Flavor Symmetry Studies with New Hyperon Data from the Crystal Ball

1 Introduction
2 k-p -> nA
3 TT-p -> TT0TT0n K-p -> TT0TT0A and K-p -> TT0TT0E0
4 Flavor Symmetry and the Masses of the Hyperons
5 Flavor Symmetry and the Search for the Missing Baryon Resonances
6 Summary and Conclusion
References

Higher Resonances and the Example of Two Pion Electroproduction with the CLAS Detector at Jefferson Lab

1 Physics Issues
2 Kinematics and Observables
3 Theoretical Aspects
4 Data Collection with CLAS
5 Preliminary Data Cross Sections and Physical Analysis
6 Summary and Conclusions
References

Nucleon Resonances and Mesons in Nuclei

1 Introduction
2 Photoabsorption on Free and Bound Nucleons
3 Properties of Bound Nucleon Resonances
4 Scalar Mesons in the Nuclear Medium
5 Summary
References

Excitation of Nucleon Resonances

1 Introduction
2 The yNA(1232) Transition - From Precision Experiments to Precision Calculations.
3 The 2nd Resonance Region
4 Missing Baryon Resonances
5 The Nucleon Spin Integral from Small to Large Distances - A Proposal for the Next 5 Years
Closing Remarks
In Memoriam
References

Multipole Analysis of a Benchmark Data Set for Pion Photoproduction

1 Overview
2 Multipole Analysis with MAID and a Dynamical Model
3 Multipole Analysis of Pion Photoproduction with Constraints from Fixed-t Dispersion Relations and Unitarity
4 Analysis of Low-Energy Benchmark Data Using Fixed-t Dispersion Relations
5 The Effective Lagrangian Analysis of the Benchmark Dataset
6 Multipole Analysis of the Benchmark Set Covering the First Resonance Region
7 SAID Multipole Analysis of the Benchmark Dataset
8 Conclusions and Future Projects
References

Appendix

Author Index
Program of the Workshop
List of Participants