Multiquark structures in heavy-light meson systems Original Research Article

We look for possible signatures of multiquark structures in the heavy-light meson spectra. The controversial View the MathML source and View the MathML source states are properly described if considered as a mixture of conventional P-wave View the MathML source and four-quark components. The recently discovered View the MathML source appears as the orthogonal partner of the View the MathML source. Similar structures are predicted in the Bs sector. We also consider the possible existence of isolated I=1 four-quark resonances and we argue that their existence can disentangle the ϒ(nS)→ϒ(mS)ππ decay puzzle.