Abstract
I study the D s ( 2317 ) and D s ( 2457 ) discovered at BaBar, CLEO and Belle, and find that they belong to a class of strange S = − 1 tetraquarks and pentaquarks, which is equivalent to the class of kaonic molecules bound by short range attraction. In this class of hadrons a kaon is strongly trapped by a s-wave meson or baryon. To describe this class of multiquarks the Resonating Group Method is applied to a standard quark model with chiral symmetry breaking, and the short range kaon-meson(baryon) interactions are extracted. A criterion is derived to classify the attractive channels. I conclude that the mesons B s ( 0 + ) , B s ( 1 + ) , and the baryons Ω c c , Ω c b , Ω b b clearly belong to the new hadronic class of the D s ( 2317 ) and D s ( 2457 ) . The hadrons f 0 ( 980 ) , Λ , Σ c , Σ b possibly belong to a related family.
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