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AbstractAbstract
[en] Within the meson exchange framework of the Bonn NN-potential a model for the anti KN interaction near threshold is constructed. Employing a coupled-channels formalism we calculate total cross sections for six particle channels (pK-, nanti K0, Λπ0, Σ0π0, Σ+π-, Σ-π+) and the Λ(1405) mass spectrum. The close connection between KN and anti KN diagrams due to G-parity conservation is exploited in order to examine the nature of short-range repulsion in the KN system. Our investigation suggests that this repulsion is not entirely due to ω-exchange but in addition consists of so far unknown processes of mixed G-parity. Furthermore, fourth-order contributions to the anti KN potential are shown to provide an important isospin dependent part of the interaction while Coulomb corrections turn out to be small, but not totally negligible. Our model definitely predicts Λ(1405) to be a anti KN quasibound state. The observed mass spectrum is reproduced without the inclusion of a genuine three quark state. Therefore we consider Λ(1670) to be the first excited 1/2- state of the uds-system and include corresponding pole graphs in our model. (orig.)
[de]
Im Rahmen des Programms, die Universalitaet des Bonner Modells zur Beschreibung der starken Wechselwirkung zu testen, haben wir in enger Orientierung an der Konstruktion der KN-Wechselwirkung eine Beschreibung des anti KN-Systems entworfen. Wir konnten ein Modell vorstellen, das sowohl unitaere Symmetrie bezueglich der Kopplungskonstanten als auch fast alle bereits an anderen Systemen festgelegten Potentialparameter respektiert. Die wesentliche Ausnahme stellte die bereits im KN-Modell eingefuehrte phaenomenologische Repulsion dar, die der Einfachheit halber durch ein schweres, repulsives 0+-Teilchen parametrisiert wurde. Die deutliche Abschwaechung dieses Beitrags beim Uebergang vom KN- zum anti KN-System konnte demonstriert und durch die Annahme, dieses Teilchen parametrisiere kurzreichweitige Prozesse gemischter G-Paritaet, erklaert werden. Auf diese Weise wurde etwas Licht auf die bereits am NN-System beobachtete, kurzreichweitige Repulsion geworfen. (orig./HSI)Original Title
Antikaon-Nukleon-Wechselwirkung im Mesonaustauschbild
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Source
Oct 1989; 149 p
Record Type
Report
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Numerical Data
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ANTIKAONS NEUTRAL, ARGAND DIAGRAMS, BOUND STATE, CHARGE-EXCHANGE INTERACTIONS, COUPLED CHANNEL THEORY, DIFFERENTIAL CROSS SECTIONS, ENERGY DEPENDENCE, EXCITATION FUNCTIONS, FEYNMAN DIAGRAM, FLAVOR MODEL, HELICITY, INELASTIC SCATTERING, INTEGRAL CROSS SECTIONS, INTERACTION RANGE, KAON MINUS-PROTON INTERACTIONS, KAON-NUCLEON INTERACTIONS, KAONS MINUS, LAGRANGIAN FIELD THEORY, LAMBDA PARTICLES, LAMBDA-1405 BARYONS, LAMBDA-1670 BARYONS, LIPPMANN-SCHWINGER EQUATION, MEV RANGE 100-1000, NEUTRONS, OPE MODEL, OPTICAL THEOREM, PHASE SHIFT, PIONS MINUS, PIONS NEUTRAL, PIONS PLUS, POTENTIAL SCATTERING, PROTONS, S MATRIX, SCATTERING AMPLITUDES, SIGMA MINUS PARTICLES, SIGMA NEUTRAL PARTICLES, SIGMA PLUS PARTICLES, SPIN ORIENTATION, SU-3 GROUPS, THEORETICAL DATA
AMPLITUDES, ANTIKAONS, ANTIMATTER, ANTIPARTICLES, BARYONS, BASIC INTERACTIONS, BOSON-EXCHANGE MODELS, BOSONS, CATIONS, CHARGED PARTICLES, COMPOSITE MODELS, CROSS SECTIONS, DATA, DIAGRAMS, DISTANCE, ELASTIC SCATTERING, ELEMENTARY PARTICLES, ENERGY RANGE, EQUATIONS, FERMIONS, FIELD THEORIES, HADRON-HADRON INTERACTIONS, HADRONS, HYDROGEN IONS, HYDROGEN IONS 1 PLUS, HYPERONS, INFORMATION, INTEGRAL EQUATIONS, INTERACTIONS, IONS, KAON-PROTON INTERACTIONS, KAONS, KAONS NEUTRAL, LAMBDA BARYONS, LIE GROUPS, MATHEMATICAL MODELS, MATRICES, MATTER, MESON-BARYON INTERACTIONS, MESON-NUCLEON INTERACTIONS, MESONS, MEV RANGE, NUCLEONS, NUMERICAL DATA, OBE MODEL, ORIENTATION, PARTICLE INTERACTIONS, PARTICLE MODELS, PARTICLE PROPERTIES, PERIPHERAL MODELS, PIONS, PSEUDOSCALAR MESONS, QUANTUM FIELD THEORY, QUARK MODEL, SCATTERING, SIGMA BARYONS, SIGMA PARTICLES, STRANGE MESONS, STRANGE PARTICLES, STRONG INTERACTIONS, SU GROUPS, SYMMETRY GROUPS
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