Multiquark structures in heavy-light meson systems

Abstract

We look for possible signatures of multiquark structures in the heavy-light meson spectra. The controversial D s 0 ∗ ( 2317 ) and D s 1 ∗ ( 2460 ) states are properly described if considered as a mixture of conventional P-wave q q ¯ and four-quark components. The recently discovered D s J ∗ ( 2860 ) appears as the orthogonal partner of the D s 0 ∗ ( 2317 ) . Similar structures are predicted in the B s sector. We also consider the possible existence of isolated I = 1 four-quark resonances and we argue that their existence can disentangle the ϒ ( n S ) → ϒ ( m S ) π π decay puzzle.