Hadron resonances with coexistence of different natures
Abstract
We discuss coexistence/mixing of different natures of hadronic composite (molecule) and elementary (quark-intrinsic) ones in hadron resonances. The discussions here are based on our previous publications on the origin of hadron resonances Hyodo:2008xr, exotic D meson-nucleons as hadronic composites containing one anti-heavy quark Yamaguchi:2011xb, and the study of a1 as a typical example to show explicitly the mixing of the two different natures Nagahiro:2011jn. In all cases, interactions are derived from the chiral dynamics of the light flavor sector. These interactions generate in various cases hadronic composite/molecule states, serving varieties of structure beyond the conventional quark model.
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