¯N interaction from meson-exchange and quark-gluon dynamics |
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Authors: | J Haidenbauer G Krein U -G Meißner A Sibirtsev |
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Institution: | 1.Institut für Kernphysik,Forschungszentrum Jülich,Jülich,Germany;2.Instituto de F?sica Teórica,Universidade Estadual Paulista,S?o Paulo, SP,Brazil;3.Helmholtz-Institut für Strahlen- und Kernphysik (Theorie),Universit?t Bonn,Bonn,Germany |
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Abstract: | We investigate the ˉN interaction at low energies using a meson exchange model supplemented with a short-distance contribution from one-gluon exchange.
The model is developed in close analogy to the meson-exchange KN interaction of the Jülich group utilizing SU(4) symmetry constraints. The main ingredients of the interaction are provided by vector meson (ρ , ω exchange and higher-order
box diagrams involving ˉ*
N , ˉΔ , and ˉ*Δ intermediate states. The short-range part is assumed to receive additional contributions from genuine quark-gluon processes.
The predicted cross-sections for ˉN for excess energies up to 150MeV are of the same order of magnitude as those for KN but with average values of around 20mb, roughly a factor two larger than for the latter system. It is found that the ω -exchange
plays a very important role. Its interference pattern with the ρ -exchange, which is basically fixed by the assumed SU(4) symmetry, clearly determines the qualitative features of the ˉN interaction --very similiar to what happens also for the KN system. |
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Keywords: | 14 40 Lb Charmed mesons 12 39 Pn Potential models 12 40 -y Other models for strong interactions 13 75 Jz Kaon-baryon interactions |
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