Dbar-N interaction from meson-exchange and quark-gluon dynamics
Abstract
We investigate the Dbar-N 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 Juelich 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*N, D\Delta, and D*\Delta intermediate states. The short range part is assumed to receive additional contributions from genuine quark-gluon processes. The predicted cross sections for Dbar-N for excess energies up to 150 MeV are of the same order of magnitude as those for KN but with average values of around 20 mb, 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 Dbar-N interaction -- very similiar to what happens also for the KN system.
Keywords
Cite
@article{arxiv.0704.3668,
title = {Dbar-N interaction from meson-exchange and quark-gluon dynamics},
author = {J. Haidenbauer and G. Krein and Ulf-G. Meißner and A. Sibirtsev},
journal= {arXiv preprint arXiv:0704.3668},
year = {2008}
}