2016/09/07 by Ortega, Pablo G., Segovia, Jorge, Entem, David R. +1
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Lattice (hep-lat) #High Energy Physics - Phenomenology (hep-ph) #Nuclear Theory (nucl-th)
paper · doi:10.48550/arxiv.1609.01846
Different experiments have confirmed that the Ds0∗(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 cs ground states with quantum numbers JP=0+ (Ds0∗(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 Ds0∗(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 jqP=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.