Published February 21, 2008
| Version v1
Journal article
Crossing symmetry and phenomenological widths in effective Lagrangian models of the pion photoproduction process
- 1. Grupo de Fisica Nuclear, Departamento de Fisica Atomica, Molecular y Nuclear, Facultad de Ciencias Fisicas, Universidad Complutense de Madrid, Avda. Complutense s/n, E-28040 Madrid (Spain)
- 2. Instituto de Estructura de la Materia, CSIC, Serrano 123, E-28006 Madrid (Spain)
Description
We investigate the importance of crossing symmetry in effective field models and the effects of phenomenological nucleon resonance widths on the paradigmatic case of pion photoproduction. We use reaction models containing four star resonances up to 1.8 GeV (Δ(1232), N(1440), N(1520), N(1535), Δ(1620), N(1650), Δ(1700), and N(1720)) with different prescriptions for crossed terms and widths, to fit the latest world database on pion photoproduction. We compare χ2 results from selected multipoles and fits. The χ2 is highly dependent on the fulfillment of crossing symmetry and the inclusion of u channels
Availability note (English)
Available from http://dx.doi.org/10.1016/j.physletb.2007.11.099Additional details
Identifiers
- DOI
- 10.1016/j.physletb.2007.11.099;
- arXiv
- arXiv:0801.2983v1;
- PII
- S0370-2693(07)01468-2;
Publishing Information
- Journal Title
- Physics Letters. Section B
- Journal Volume
- 660
- Journal Issue
- 3
- Journal Page Range
- p. 188-192
- ISSN
- 0370-2693
- CODEN
- PYLBAJ
INIS
- Country of Publication
- Netherlands
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 39080886
- Subject category
- S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
- Descriptors DEI
- COMPARATIVE EVALUATIONS; CROSSING SYMMETRY; DATA ANALYSIS; DELTA-1232 BARYONS; DELTA-1620 BARYONS; DELTA-1700 BARYONS; GEV RANGE; LAGRANGIAN FUNCTION; N-1440 BARYONS; N-1520 BARYONS; N-1535 BARYONS; N-1650 BARYONS; N-1720 BARYONS; NUCLEONS; PARTICLE WIDTHS; PHOTOPRODUCTION; PIONS; RESONANCE PARTICLES
- Descriptors DEC
- BARYONS; BASIC INTERACTIONS; BOSONS; DELTA BARYONS; ELECTROMAGNETIC INTERACTIONS; ELEMENTARY PARTICLES; ENERGY RANGE; EVALUATION; FERMIONS; FUNCTIONS; HADRONS; INTERACTIONS; MESONS; N BARYONS; N*BARYONS; PARTICLE INTERACTIONS; PARTICLE PRODUCTION; PARTICLE PROPERTIES; PSEUDOSCALAR MESONS; SYMMETRY
Optional Information
- Copyright
- Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.