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

• Main Authors: Ortega Pablo G., Segovia Jorge, Entem David R., Fernández Francisco
• Format: Article
• Language: English
• Published: EDP Sciences 2016-01-01
• Series: EPJ Web of Conferences
• Online Access: http://dx.doi.org/10.1051/epjconf/201613002009

Different experiments have confirmed that the D*s0(2317) and Ds1(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 cs̄ ground states with quantum numbers JP = 0+ (D*s0(2317)) and JP = 1+ (Ds1(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*s0(2317) and Ds1(2460) states predicted by the naive quark model, but also in describing the Ds1(2536) meson as the 1+ state of the jPq = 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+ cs̄ channel and the computation of the probabilities associated with different Fock components in the physical state.