Nstar 2001 Proceedings of the Workshop on the Physics of Excited Nucleons

Organization......Page 6
Foreword......Page 8
CONTENTS......Page 10
2 Effective Degrees of Freedom......Page 20
4 Residual Interactions......Page 22
6 Hybrid Baryons......Page 24
7 Effects of Decay Channel Couplings......Page 25
9 Summary......Page 26
References......Page 27
1 Introduction......Page 30
2 Theoretical Developments......Page 32
3 The Bates y* N -> A Program......Page 33
4 Future Prospects and Acknowledgments......Page 36
References......Page 37
1 Introduction......Page 38
2 Neutron Identification......Page 39
3 First Results......Page 41
References......Page 44
1 Introduction......Page 46
2 Results of the p(e e'p)TT0 Experiment......Page 47
3 Forward and Backward LT-Asymmetry in p(e e'p)TT0......Page 49
4 Fifth Structure Function in p(e e'p)TT0......Page 51
5 Summary......Page 52
References......Page 53
1 Introduction......Page 54
References......Page 61
2 Measurement Philosophy: Exploiting Hall A's Tools......Page 62
4 Accessible Responses and Expected Sensitivity to S1+.......Page 63
5 Data Analysis - Sample Spectra......Page 67
6 Conclusions/Outlook......Page 68
References......Page 69
1 Introduction......Page 70
2 Chiral Calculations and Power Counting......Page 71
3 Anomalous Magnetic Moments of the Nucleon......Page 72
4 Isovector Form Factors of the Nucleon......Page 74
5 Isovector Nucleon-Delta Transition Form Factors......Page 75
6 Summary......Page 76
References......Page 77
1 Introduction......Page 78
2 Meson-Baryon Scattering in Coupled Channels......Page 79
3 Strangeness S = -1 Sector......Page 80
5 Strangeness S = -2 Sector......Page 83
6 Conclusions......Page 84
References......Page 85
1 Chiral Symmetry......Page 86
2 Elastic TTN Scattering and Unitarization......Page 88
3 Coupled Channel NK Scattering......Page 91
4 Conclusions......Page 92
References......Page 93
1 Introduction......Page 94
2 Effective Hamiltonian and Electromagnetic Current......Page 95
3 Pion Photoproduction and Electroproduction......Page 97
4 Summary......Page 99
Acknowledgments......Page 100
References......Page 101
1 Introduction......Page 102
2 Formalism......Page 103
3 Pion Photo- and Electroproduction in the A(1232) Region......Page 104
4 Threshold TT0 Photoproduction......Page 106
5 Threshold TT0 Electroproduction......Page 108
6 Conclusion......Page 109
References......Page 110
2 The Model......Page 112
3 Results......Page 113
4 Summary......Page 117
References......Page 118
1 Overview......Page 120
3 Fitting the Full Resonance Region......Page 121
4 Conclusions and Further Questions......Page 124
References......Page 125
1 Introduction......Page 128
2 Coupled-channels Analyses......Page 129
3 Results and Discussion......Page 130
4 Conclusions and Outlook......Page 135
References......Page 136
1 Introduction......Page 138
2 Electromagnetic Form Factors......Page 140
3 Structure Functions......Page 143
References......Page 145
1 Pion Coupling to Constituent Quarks......Page 148
2 Model Calculations of Resonance Decay Widths......Page 149
3 Pion Decays of D-Mesons......Page 150
4 Conclusion......Page 152
References......Page 153
1 Introduction......Page 154
2 Relativistic Constituent Quark Models......Page 155
3 Nucleon Elastic Form Factors and the N - P11(1440) Transition......Page 157
4 Conclusions......Page 161
References......Page 162
1 Introduction......Page 164
2 Compton Tensor and Low-Energy Theorem......Page 165
3 Generalized Polarizabilities and their Interpretation......Page 166
4 Compton Tensor in a Nonrelativistic Framework......Page 168
5 Generalized Polarizabilities in a Constituent Quark Model......Page 169
6 Results......Page 170
7 Summary......Page 171
References......Page 172
1 Introduction......Page 174
2 Perturbative Chiral Quark Model......Page 175
3 Results......Page 179
References......Page 181
2 The Analysis......Page 182
3 Results......Page 183
References......Page 185
1 Introduction......Page 186
2 Reducing of Dispersion Relations for M3/2 1+ E3/2 1+ to Integral Equations and the Solution of these Equations......Page 187
References......Page 189
1 Introduction......Page 190
3 Results and Discussion......Page 191
References......Page 194
Detailed Analysis of n Production in Proton-Proton Collisions......Page 196
References......Page 199
2 Model Description......Page 200
3 Real Photon......Page 201
4 Virtual Photons......Page 202
References......Page 203
1 Determination of Resonance Parameters from Speed Plots......Page 204
2 The Background in the P33 Partial Wave......Page 205
References......Page 207
2 Formalism......Page 208
3 Discussion and Results......Page 209
4 Summary......Page 210
References......Page 211
1 Introduction......Page 212
3 Results on (Pseudo)scalar Meson Production......Page 213
4 Vector Meson Production......Page 214
References......Page 215
Multipole Analysis for Pion Photoproduction with MAID and a Dynamical Model......Page 216
References......Page 220
1 Introduction......Page 222
2 The Participants and their Models......Page 223
3 Results......Page 224
References......Page 225
1 Introduction......Page 226
2 Low-Energy Region: S11(1535) and D13(1520)......Page 227
3 Intermediate-Energy Region: S11(1650) and D13(1700)......Page 228
Acknowledgments......Page 229
References......Page 230
Electroweak Properties of Baryons in a Covariant Chiral Quark Model......Page 232
References......Page 235
2 The qqqqq System......Page 236
3 Summary......Page 238
References......Page 239
Parity Doublets from a Relativistic Quark Model......Page 240
References......Page 243
A Dispersion Theoretical Approach to Virtual Compton Scattering off the Proton......Page 244
References......Page 247
Neutron Charge Form Factor and Quadrupole Deformation of the Nucleon......Page 248
References......Page 251
The Ground and Radial Excited States of the Nucleon in a Relativistic Schodinger-Type Model......Page 252
References......Page 255
1 Introduction......Page 256
2 Analysis......Page 257
References......Page 259
Status of Nucleon Resonances with Masses M < MN + MTT......Page 260
References......Page 263
1 Introduction: The GDH Sum Rule for the A(1232)......Page 264
2 Photocouplings in NQM: The Role of Spin-Orbit Corrections......Page 265
3 Differential Cross Section of yN -> yA......Page 266
References......Page 267
1 Introduction......Page 268
2 T-Matrix Description of TT-N and a-p Scattering......Page 270
References......Page 271
Structure of the Nucleon Investigated by Compton Scattering......Page 274
References......Page 277
1 Virtual Compton Scattering......Page 278
3 Preliminary Results for Cross Sections......Page 279
References......Page 281
2 Experiment and Data Analysis......Page 282
3 Results and Discussion......Page 283
References......Page 285
Positive Pion Photoproduction and Compton Scattering at GRAAL......Page 286
References......Page 289
2 Experimental Considerations......Page 290
3 Pion Electroproduction......Page 291
5 Conclusion......Page 292
References......Page 293
1 Introduction......Page 294
References......Page 295
1 Introduction......Page 298
2 Experimental Considerations......Page 299
4 Acknowledgments......Page 301
Observation of n-Mesic Nuclei in Photoreactions: Results and Perspectives......Page 302
References......Page 305
1 Study of TT-p Charge Exchange Scattering in the Region of Low-Lying Pion-Nucleon Resonances......Page 306
2 Measurement of the Spin Rotation Parameters for TT+p Elastic Scattering in the Second Resonance Region......Page 308
References......Page 309
1 Introduction......Page 310
2 Experimental Setup......Page 311
3 Results and Summary......Page 312
References......Page 313
1 Introduction......Page 314
2 Method......Page 315
3 Results and Discussion......Page 317
4 Conclusion......Page 320
References......Page 321
1 Introduction......Page 322
2 Nucleon Excited States......Page 323
3 Nucleon Matrix Elements......Page 324
4 Conclusions......Page 328
References......Page 329
2 Bloom-Gilman Duality......Page 330
3 Understanding the Origin of Duality......Page 332
4 Applications of Local Duality......Page 334
5 Conclusion......Page 336
References......Page 337
2 Generalized GDH Sum Rules......Page 338
3 JLab E94-010 Experiment......Page 340
5 Outlook and Summary......Page 344
References......Page 345
1 Motivation and Theoretical Description......Page 346
2 Description of the Experiment......Page 348
3 Data Analysis and Results......Page 349
References......Page 353
1 Experimental Setup......Page 354
2 Results......Page 355
References......Page 357
1 Introduction......Page 358
2 Experimental Setup and Analysis Methods......Page 359
3 Preliminary Results and Conclusion......Page 362
References......Page 364
Meson Photoproduction at GRAAL......Page 366
2 The Graal Experimental Set-up......Page 367
3 n Photoproduction......Page 368
4 TT0 Photoproduction......Page 371
5 K+ A Photoproduction......Page 372
References......Page 373
2 Analysis Technique......Page 374
3 Preliminary Tests......Page 378
References......Page 382
2 Results from First Data Run......Page 384
3 Prospects and Conclusions......Page 387
References......Page 390
1 Introduction......Page 392
2 Formalism and Kinematics......Page 393
3 The CLAS Program......Page 394
4 Results......Page 395
5 Summary......Page 398
References......Page 399
1 Introduction......Page 400
2 Cross Sections......Page 403
References......Page 407
2 VMD Analysis of the Electromagnetic Resonance Decay......Page 408
3 The p Meson......Page 410
4 The w Meson......Page 411
6 Acknowledgments......Page 414
References......Page 415
Higher and Missing Resonances in w Photoproduction......Page 416
References......Page 422
1 Introduction......Page 424
2 The CB-ELSA Detector......Page 426
3 First Data......Page 427
4 Conclusions......Page 430
References......Page 431
1 Physics Motivation......Page 432
2 LEPS Facility......Page 433
3 Detector......Page 435
4 Results and Prospects......Page 437
References......Page 438
1 Physics motivation......Page 440
2 Data Status......Page 441
3 Partial Wave Analyses......Page 443
Acknowledgments......Page 444
References......Page 445
1 Introduction......Page 446
2 k-p -> nA......Page 448
3 TT-p -> TT0TT0n K-p -> TT0TT0A and K-p -> TT0TT0E0......Page 450
4 Flavor Symmetry and the Masses of the Hyperons......Page 452
5 Flavor Symmetry and the Search for the Missing Baryon Resonances......Page 453
6 Summary and Conclusion......Page 455
References......Page 456
1 Physics Issues......Page 458
2 Kinematics and Observables......Page 459
3 Theoretical Aspects......Page 460
5 Preliminary Data Cross Sections and Physical Analysis......Page 461
6 Summary and Conclusions......Page 464
References......Page 465
1 Introduction......Page 466
2 Photoabsorption on Free and Bound Nucleons......Page 467
3 Properties of Bound Nucleon Resonances......Page 468
4 Scalar Mesons in the Nuclear Medium......Page 472
5 Summary......Page 473
References......Page 474
1 Introduction......Page 476
2 The yNA(1232) Transition - From Precision Experiments to Precision Calculations.......Page 477
3 The 2nd Resonance Region......Page 478
4 Missing Baryon Resonances......Page 480
5 The Nucleon Spin Integral from Small to Large Distances - A Proposal for the Next 5 Years......Page 481
In Memoriam......Page 483
References......Page 484
1 Overview......Page 486
2 Multipole Analysis with MAID and a Dynamical Model......Page 487
3 Multipole Analysis of Pion Photoproduction with Constraints from Fixed-t Dispersion Relations and Unitarity......Page 492
4 Analysis of Low-Energy Benchmark Data Using Fixed-t Dispersion Relations......Page 496
5 The Effective Lagrangian Analysis of the Benchmark Dataset......Page 498
6 Multipole Analysis of the Benchmark Set Covering the First Resonance Region......Page 503
7 SAID Multipole Analysis of the Benchmark Dataset......Page 508
8 Conclusions and Future Projects......Page 509
References......Page 510
Author Index......Page 512
Program of the Workshop......Page 516
List of Participants......Page 520