Extension of the Bonn meson exchange NN potential above pion production threshold: Nucleon renormalization and unitarity

Journal Article · Fri Apr 01 04:00:00 EST 1988 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.37.1647· OSTI ID:5436656

Elster, C; Ferchlaender, W; Holinde, K; Schuette, D; Machleidt, R

Nucleon self-energy diagrams, which are necessary to satisfy unitarity in NN scattering above pion production threshold, are studied for a realistic one-boson-exchange model. It is demonstrated that, in the framework of noncovariant perturbation theory, the independent iteration of (lowest order) bubble diagrams at both nucleon lines leads to dressing factors which provide well-defined off-shell corrections to the meson exchange contributions. It turns out that nucleon dressing yields additional attraction in lower partial waves. A slight readjustment of meson parameters (especially a reduction of the cutoff mass in the ..pi..NN vertex) leads to a reproduction of the empirical NN data below pion threshold which is of the same quality as before. The resulting inelasticities are, however, much too small, which clearly establishes the need for using a NN potential model containing the ..delta.. isobar explicitly.

• Research Organization: Institut fuer Theoretische Kernphysik, Universitaet Bonn, D-5300 Bonn, Federal Republic of Germany
• OSTI ID: 5436656
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 37:4; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

645204 -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Strong Interactions & Properties
653003* -- Nuclear Theory-- Nuclear Reactions & Scattering
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYON-BARYON INTERACTIONS
BARYONS
BOSON-EXCHANGE MODELS
BOSONS
COUPLING CONSTANTS
CROSS SECTIONS
ELASTIC SCATTERING
ELEMENTARY PARTICLES
ENERGY
FERMIONS
FIELD THEORIES
HADRON-HADRON INTERACTIONS
HADRONS
HAMILTONIANS
INTERACTIONS
MATHEMATICAL MODELS
MATHEMATICAL OPERATORS
MESONS
NUCLEAR MODELS
NUCLEON-NUCLEON INTERACTIONS
NUCLEON-NUCLEON POTENTIAL
NUCLEONS
OBE MODEL
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
PERIPHERAL MODELS
PERTURBATION THEORY
PIONS
POTENTIALS
PSEUDOSCALAR MESONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUANTUM OPERATORS
RENORMALIZATION
SCATTERING
SELF-ENERGY
SHELL MODELS
THRESHOLD ENERGY
UNITARITY