Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2003-12-19
Phys.Rev. C69 (2004) 035209
Physics
Nuclear Physics
Nuclear Theory
19 pages, 8 figures, accepted for publication in PRC
Scientific paper
10.1103/PhysRevC.69.035209
We studied meson-meson interactions using the 't Hooft model, which represents QCD in 1+1 dimensions and assumes a large number of colors ($N_c$). The dominant interactions in this large $N_c$ limit are generated by quark exchange. Our results show that QCD in 1+1 dimensions allows the realization of a constituent-type quark model for the mesons, and generates a scalar ``$\sigma$''-like meson-meson resonance, whose effective coupling and mass are determined by the underlying QCD dynamics. These results suggest an interpretation of the lightest scalar mesons as $q\bar{q} q \bar{q}$ systems.
Batiz Zoltan
Pena M. T.
Stadler Alfred
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