Molecular components in D*s0(2317) and Ds1(2460) mesons

Abstract

Different experiments have confirmed that the D * s 0 (2317) and D s 1 (2460) mesons are very narrow states located, respectively, below the DK and D* K thresholds. This is markedly in contrast with the expectations of naive quark models and heavy quark symmetry. We address the mass shifts of the cs ground states with quantum numbers JP = 0+ (D * s 0 (2317)) and JP = 1+ (D s 1 (2460)) using a nonrelativistic constituent quark model in which quark-antiquark and meson-meson degrees of freedom are incorporated. The quark model has been applied to a wide range of hadronic observables and thus the model parameters are completely constrained. We observe that the coupling of the 0+ (1+ ) meson sector to the DK (D* K ) threshold is a key feature in lowering the masses of the corresponding D * s 0 (2317) and D s 1 (2460) states predicted by the naive quark model, but also in describing the Ds 1 (2536) meson as the 1+ state of the jP q = 3/2+ doublet predicted by heavy quark symmetry and thus reproducing its strong decay properties. Two features of our formalism cannot be address nowadays by other approaches: the coupling of the D -wave D* K threshold in the JP = 1+ cs channel and the computation of the probabilities associated with different Fock components in the physical state.