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Título

Nature of the lowest-lying odd parity charmed baryon Λc (2595) and Λc (2625) resonances

Otros títulosNature of the lowest-lying odd parity charmed baryon Lambda(c)(2595) and Lambda(c)(2625) resonances
AutorNieves, Juan Miguel CSIC ORCID ; Pavao, R.P.
Fecha de publicaciónmar-2020
EditorAmerican Physical Society
CitaciónPhysical Review D 101 (1): 014018 (2020)
ResumenWe study the structure of the Λc(2595) and Λc(2625) resonances in the framework of an effective field theory consistent with heavy quark spin and chiral symmetries, which incorporates the interplay between ςc(∗)π-ND(∗) baryon-meson degrees of freedom (d.o.f.) and bare P-wave cūd quark-model states. We show that these two resonances are not heavy quark spin symmetry partners. The JP=3/2- Λc(2625) should be viewed mostly as a dressed three-quark state, whose origin is determined by a bare state, predicted to lie very close to the mass of the resonance. The JP=1/2- Λc(2595) seems to have, however, a predominant molecular structure. This is because it is either the result of the chiral ςcπ interaction, whose threshold is located much closer than the mass of the bare three-quark state, or because the light d.o.f. in its inner structure are coupled to the unnatural 0- quantum numbers. We show that both situations can occur depending on the renormalization procedure used. We find some additional states, but the classification of the spectrum in terms of heavy quark spin symmetry is difficult, despite having used interactions that respect this symmetry. This is because the bare quark-model state and the ςcπ threshold are located extraordinarily close to the Λc(2625) and Λc(2595), respectively, and hence they play totally different roles in each sector.
Versión del editorhttp://dx.doi.org/10.1103/PhysRevD.101.014018
URIhttp://hdl.handle.net/10261/216056
DOI10.1103/PhysRevD.101.014018
Identificadoresdoi: 10.1103/PhysRevD.101.014018
issn: 2470-0029
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