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Pion photoproduction in the. delta. (1232) region and chiral bag models

Journal Article · · Phys. Rev. D; (United States)
;

We calculate pion photoproduction near the ..delta..(1232) resonance using a version of the chiral bag model based on an effective Lagrangian that reproduces correct pion-nucleon phenomenology through third order in the pion field. The pionic corrections to the M1 (or M1+) amplitude are common to a broad class of chiral bag models and substantially improve agreement with experiment. We treat also the E2 (or E1+) multipole which is accessible in our approach since the effective Lagrangian induces quark-quark tensor coupling through pion exchange; this in turn permits the admixture of baryon components involving quark excitation to d states. The resulting E2 admixture is consistent with the rather loose bounds set by the present experimental information on this quantity. The present work neglects the tensor force and d state arising from gluon exchange between quarks.

Research Organization:
Department of Physics and Astronomy, Tel Aviv University, 69978 Tel Aviv, Israel
OSTI ID:
6045859
Journal Information:
Phys. Rev. D; (United States), Journal Name: Phys. Rev. D; (United States) Vol. 28:1; ISSN PRVDA
Country of Publication:
United States
Language:
English

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Related Subjects

645202* -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Electromagnetic Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BAG MODEL
BARYON RESONANCES
BARYONS
BASIC INTERACTIONS
BOSONS
CHIRALITY
COMPOSITE MODELS
DELTA-1236 RESONANCES
E2-TRANSITIONS
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ENERGY-LEVEL TRANSITIONS
EXCHANGE INTERACTIONS
EXTENDED PARTICLE MODEL
FERMIONS
GLUONS
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
M1-TRANSITIONS
MATHEMATICAL MODELS
MESON-BARYON INTERACTIONS
MESON-NUCLEON INTERACTIONS
MESONS
MULTIPOLE TRANSITIONS
N RESONANCES
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
PARTICLE PROPERTIES
PHOTOPRODUCTION
PION-NUCLEON INTERACTIONS
PIONS
POSTULATED PARTICLES
PSEUDOSCALAR MESONS
QUARK MODEL
RESONANCE PARTICLES