NSTAR 2001 [[electronic resource] ] : proceedings of the Workshop on the Physics of Excited Nucleons : Mainz, Germany, 7-10 March 2001 / / editors, D. Drechsel & L. Tiator

• Record Nr.: UNINA9910782278403321
• Pubbl/distr/stampa: Singapore ; ; River Edge, NJ, : World Scientific, c2001
• ISBN: 1-281-95646-5; 9786611956462; 981-281-087-0
• Descrizione fisica: 1 online resource (528 p.)
• Altri autori (Persone): TiatorL (Lothar); DrechselD. <1937->
• Disciplina: 539.7/216; 539.7212; 539.7216
• Soggetti: Hadrons; Particles (Nuclear physics); Baryons
• Lingua di pubblicazione: Inglese
• Formato: Materiale a stampa
• Livello bibliografico: Monografia
• Note generali: Description based upon print version of record.
• Nota di bibliografia: Includes bibliographical references and index.
• Nota di contenuto: CONTENTS ; Organization ; Foreword ; 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
• Sommario/riassunto: The study of N*s can provide us with critical insights into the nature of QCD in the confinement domain. The keys to progress in this domain are the identification of its important degrees of freedom and the effective forces between them. The nucleon is the simplest system in which the nonabelian character of QCD is manifest. There are Nc quarks in a baryon because there are Nc colors, and as a consequence Gell-Mann and Zweig were forced to introduce the quarks in order to describe the octet and decuplet baryons. This volume gives a status report on the recent experimental and theoretical results in the field of nucleon resonance physics. A wealth of new high precision data was presented from facilities around the world, such as BES, BNL, ELSA, GRAAL, JLab, MAMI, MIT/Bates, SPring8, and Yerevan. Particular emphasis was laid on polarization degrees of freedom and large acceptance detectors as precision tools for studying small but important transition amplitudes, and the helicity (spin) structure of the nucleon. There were new results describing the nucleon resonance structure on the basis of quantum chromodynamics, either directly in terms of quarks and gluons by means of lattice gauge theory, or in terms of hadrons in the framework of chiral field theories. A status report on duality showed the surprising connections between the physics of the low energy nucleon resonance region and the realm of quark structure functions in deep inelastic scattering. Finally, this volume contains a summary report of the BRAG workshop, devoted to the analysis of baryon resonances.

Commutative algebra : interactions with algebraic geometry : International Conference, Grenoble, France, July 9-13, 2001, Special Session at the Joint International Meeting of the American Mathematical Society and the Société Mathématique de France, Lyon, France, July 17-20, 2001 / / Luchezar L. Avramov [and three others], editors

• Record Nr.: UNINA9910828541003321
• Pubbl/distr/stampa: Providence, Rhode Island : , : American Mathematical Society, , [2003]; ©2003
• ISBN: 0-8218-7921-9
• Descrizione fisica: 1 online resource (376 p.)
• Collana: Contemporary mathematics, ; 331 , 0271-4132
• Disciplina: 512/.24
• Soggetti: Commutative algebra
• Lingua di pubblicazione: Inglese
• Formato: Materiale a stampa
• Livello bibliografico: Monografia
• Note generali: Description based upon print version of record.
• Nota di bibliografia: Includes bibliographical references.
• Nota di contenuto: Contents -- Introduction -- List of talks and references to publications -- Linearization of local cohomology modules -- Multiplicity-free subvarieties of flag varieties -- Morita contexts, idempotents, and Hochschild cohomology "with applications to invariant rings" -- Introduction -- 1. Morita contexts -- 2. The grade of the stable endomorphism ring -- 3. Equivalences to the generalized Nakayama conjecture -- 4. The comparison homomorphism for Hochschild cohomology -- 5. Hochschild cohomology of Auslander contexts -- 6. Invariant rings: The general case -- 7. Invariant rings: The commutative case -- References -- Some applications of two dimensional complete ideals -- Generically finite morphisms and simultaneous resolution of singularities -- Two results on the number of generators -- When is a binomial ideal equal to a lattice ideal up to radical? -- Depth and amplitude for unbounded complexes -- On the ideal of minors of matrices of linear forms -- Surjectivity of multiplication and F-regularity of multigraded rings -- On the Ext-modules of ideals of Borel type -- Sums of linked tepli ideals -- Cartan involutiveness = Mumford regularity -- The Frobenius endomorphism and homological dimensions -- Characterization of some projective subschemes by locally free resolutions -- 1. ; Introduction -- 2. Preliminaries -- 3. q-presentations -- 4. Surjective-Buchsbaum modules -- 5. Arithmetically Buchsbaum subschemes -- 6. Quasi-Buchsbaum subschemes -- 7. Surfaces in P4 -- References -- On unique factorization in semigroups of complete ideals -- Modules with strange homological properties and Chebychev polynomials -- Notes on the behavior of the Ratliff-Rush filtration -- On symbolic powers of prime ideals -- Multiplicities and the number of generators of Cohen-Macaulay ideals -- Chains of integrally closed ideals.