Tetraquarks with colour-blind forces in chiral quark models
S. Pepin, Fl. Stancu, M. Genovese, J. -M. Richard
Abstract
We discuss the stability of multiquark systems within the recent model of Glozman et al. where the chromomagnetic hyperfine interaction is replaced by pseudoscalar-meson exchange contributions. We find that such an interaction binds a heavy tetraquark systems QQ q q (Q=c,b and q=u,d) by 0.2-0.4 GeV. This is at variance with results of previous models where cc q q is unstable.
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