Dbar-N interaction from meson-exchange and quark-gluon dynamics

Haidenbauer, J.; Sibirtsev, A.; Meissner, U.G.; Krein, G.

doi:10.1140/epja/i2007-10417-3

Journal Article

PreJuSER-60470

Dbar-N interaction from meson-exchange and quark-gluon dynamics

Haidenbauer, J.FZJ* ; Krein, G. ; Meissner, U. G.FZJ* ; Sibirtsev, A.FZJ*

2007
Springer Berlin

The European physical journal / A 33, 107 - 117 (2007) [10.1140/epja/i2007-10417-3]

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Please use a persistent id in citations: http://hdl.handle.net/2128/10519 doi:10.1140/epja/i2007-10417-3

Abstract: We investigate the (D) over barN 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 Julich group utilizing SU(4) symmetry constraints. The main ingredients of the interaction are provided by vector meson (rho, omega) exchange and higher-order box diagrams involving (D) over bar *N , (D) over bar Delta, and (D) over bar*Delta intermediate states. The short-range part is assumed to receive additional contributions from genuine quark-gluon processes. The predicted cross-sections for (D) over barN 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 omega-exchange plays a very important role. Its interference pattern with the rho-exchange, which is basically fixed by the assumed SU(4) symmetry, clearly determines the qualitative features of the (D) over barN interaction - very similiar to what happens also for the KN system.

Keyword(s): meson nucleon: interaction ; anti-D ; meson: exchange ; effective Lagrangian ; quark gluon ; symmetry: SU(4) ; gluon: exchange ; potential ; cross section: energy dependence ; K nucleon: interaction ; numerical calculations