Details

Autor(en) / Beteiligte

• Ortega, Pablo G.
• Segovia, Jorge
• Entem, David R.
• Fernández, Francisco

Titel

Molecular components in P -wave charmed-strange mesons

Ist Teil von

• Physical review. D, 2016-10, Vol.94 (7), Article 074037

Ort / Verlag

College Park: American Physical Society

Erscheinungsjahr

2016

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Results obtained by various experiments show that the Ds0*(2317) and Ds1(2460) mesons are very narrow states located below the DK and D*K thresholds, respectively. This is markedly in contrast with the expectations of naive quark models and heavy quark symmetry. Motivated by a recent lattice study which addresses the mass shifts of the cs¯ ground states with quantum numbers JP=0+ [Ds0*(2317)] and JP=1+ [Ds1(2460)] due to their coupling with S-wave D(*)K thresholds, we perform a similar analysis within 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. The coupling between quark-antiquark and meson-meson Fock components is done using a P03 model in which its only free parameter γ has been elucidated, performing a global fit to the decay widths of mesons that belong to different quark sectors, from light to heavy. We observe that the coupling of the 0+ (1+) meson sector to the DK (D*K) threshold is the key feature to simultaneously lower the masses of the corresponding Ds0*(2317) and Ds1(2460) states predicted by the naive quark model and describe the Ds1(2536) meson as the 1+ state of the jqP=3/2+ doublet predicted by heavy quark symmetry, reproducing its strong decay properties. Our calculation allows us to introduce the coupling with the D-wave D*K channel and the computation of the probabilities associated with the different Fock components of the physical state.