N\* Physics and Nonperturbative Quantum Chromodynamics: Proceedings of the Joint ECT\*/JLAB Workshop, Trento, Italy, May 18–29, 1998

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. Front Matter....Pages I-XV Electromagnetic Excitation of Baryon Resonances and the CLAS N * Program....Pages 1-9 Perturbatile QCD Applied to Baryons....Pages 10-17 Boson and Gluon Exchange and the Quark-Quark Interaction....Pages 18-24 Semirelativistic Constituent-Quark Model with Goldstone-Boson-Exchange Hyperfine Interactions....Pages 25-28 Hadronic Decays of Baryon Resonances in the Goldstone-Boson-Exchange Constituent-Quark Model....Pages 29-32 Multiquark States in a Goldstone Boson Exchange Model....Pages 33-36 Hypercentral Constituent Quark Model....Pages 37-42 The Nucleon Wave Function in Light-Front Dynamics....Pages 43-46 Lorentz Covariant Spin—Grouping of Baryon Resonances....Pages 47-52 Baryon Properties in Soliton Models....Pages 53-56 QCD Sum Rules and Soft-Hard Interplay for Hadronic Form Factors....Pages 57-65 Light-Baryon Spectroscopy and the Electromagnetic Form Factors in the Quark Model....Pages 66-73 Charge-Current Operators Consistent with a Semi-relativistic Hamiltonian....Pages 74-77 NN and N Δ Form Factors viewed from ChPT....Pages 78-85 Missing Baryons....Pages 86-93 Amplitude Analysis....Pages 94-99 Baryon Resonance Spectrum Error Analysis, Background Effects....Pages 100-103 Coupled-Channel Analysis of N * Photoproduction....Pages 104-111 Parity-Violating Δ(1232) Electroweak Production: Axial Structure and New Physics....Pages 112-115 Nucleon Axial Matrix Elements....Pages 116-123 Electroproduction of the Δ(1232) and S 11 (1535) Resonances at High Momentum Transfer....Pages 124-129 Exchange Currents and Nucleon Deformation....Pages 130-133 The N-Δ(1232) Electromagnetic Transition....Pages 134-139 Multipole Analyses for p(γ, π) and p(γ, γ) in the Region of the P 33 Δ Resonance....Pages 140-143 Theories of Electromagnetic Productions of Pions....Pages 144-156 Single Pion Electroproduction in the Δ(1232) Resonance from CLAS Data at Jefferson Lab....Pages 157-164 Pion Photo- and Electroproduction on the Proton....Pages 165-168 Photoabsorption on Bound Nucleons in the Resonance Region....Pages 169-172 The Gerasimov-Drell-Hearn Sum Rule — Experimental Aspects....Pages 173-176 Dispersion Approach to Pion Photoproduction and GDH Sum Rule....Pages 177-181 DIS Contribution to the GDH Sum Rule....Pages 182-192 η Meson Photoproduction....Pages 193-196 The Role of N *(1520) Resonance in Eta Photoproduction in the Light of New Polarization Data....Pages 197-206 Beam Polarisation Asymmetries in Meson Photoproduction at Graal....Pages 207-215 η Physics and Multi-Resonance Coupled-Channel Analysis....Pages 216-221 K Meson Photo- and Electro- Production with CLAS at Jefferson Lab....Pages 222-224 Study of the Strange Hadrons Electromagnetic Form Factors via the Process e + p → e’ + K + + Λ....Pages 225-232 Effective Lagrangian Study of the γ p → K + Λ (Spin 3/2 Resonances and Their Off-Shell Effects)....Pages 233-240 SU(3) Chiral Dynamics with Coupled Channels: Eta and Kaon Production....Pages 241-245 The Diquark Model for Exclusive Reactions....Pages 246-254 Single Meson Photoproduction via Higher Twist Mechanism and IR Renormalons....Pages 255-262 Double Pion Photoproduction Experiments....Pages 263-266 Double Pion Production Reactions....Pages 267-274 Baryon Resonances in the Double Pion Channel at Jefferson Lab (CEBAF): Experimental and Physical Analysis Status and Perspectives....Pages 275-283 Description of Two-Pion Production on Proton by Real and Virtual Photons in N * Excitation Region....Pages 284-291 Vector Meson Production....Pages 292-297 Spin Information from Vector-Meson Decay in Photoproduction....Pages 298-307 Real and Virtual Compton Scattering (experiments)....Pages 308-315 Virtual Compton Scattering—Generalized Polarizabilities of Nucleons and Pions....Pages 316-326 Dispersion Theoretical Analysis of the Nucleon Spin Polarizabilities....Pages 327-334 The Spin of the Nucleon....Pages 335-338 Nucleon Structure Functions and Light-Front Dynamics....Pages 339-346 Nucleon Structure Functions in a Constituent Quark Scenario....Pages 347-354 Strangeness and Charm Production with HERMES....Pages 355-358 Questions on the Quark Model: Panel Discussion....Pages 359-362 Back Matter....Pages 363-364 ....Pages 365-372 The workshop was devoted to a summary of recent experimental and theoretical research on N* physics. Special emphasis was given to the information that photo- and electro-production of nucleon resonances can provide on the non-perturbative regime of quantum chromodynamics. Discussions among experimentalists and theoreticians were stimulated in order to pursue the interpretation of the huge amount of forthcoming data from several laboratories in the world. This volume contains both the invited lectures and the contributions. On the main topics, like single and double pion production, pi- and K-meson production, the GDH sum rule, and the spin of the proton.