Spectrum and structure of octet and decuplet baryons and their positive-parity excitations

Chen, Chen; Krein, Gastão; Roberts, Craig D.; Schmidt, Sebastian M.; Segovia, Jorge

doi:10.1103/PhysRevD.100.054009

Title: Spectrum and structure of octet and decuplet baryons and their positive-parity excitations

Journal Article · 13 September 2019 · Physical Review D

DOI: https://doi.org/10.1103/PhysRevD.100.054009 · OSTI ID:1574302

Chen, Chen ^[1]; Krein, Gastão ^[2];

^[3]; Schmidt, Sebastian M. ^[4]; Segovia, Jorge ^[5]

Univ. Estadual Paulista, Sao Paulo (Brazil); Justus-Liebig-Univ. Gießen, Gießen (Germany)
Univ. Estadual Paulista, Sao Paulo (Brazil)
Argonne National Lab. (ANL), Lemont, IL (United States)
Forschungszentrum Jülich and JARA, Julich (Germany)
Univ. Pablo de Olavide, Sevilla (Spain)

A continuum approach to the three-valence-quark bound-state problem in quantum field theory, employing parametrizations of the necessary kernel elements, is used to compute the spectrum and Poincare-covariant wave functions for all flavor-SU(3) octet and decuplet baryons and their first positive-parity excitations. Such analyses predict the existence of nonpointlike, dynamical quark-quark (diquark) correlations within all baryons; and a uniformly sound description of the systems studied is obtained by retaining flavor-antitriplet-scalar and flavor-sextet-pseudovector diquarks. Thus constituted, the rest-frame wave function of every system studied is primarily S wave in character; and the fast positive-parity excitation of each octet or decuplet baryon exhibits the characteristics of a radial excitation. Importantly, every ground-state octet and decuplet baryon possesses a radial excitation. Hence, the analysis predicts the existence and masses of positive-parity excitations of the Ξ, Ξ*, and Ω baryons, states which have not yet been empirically identified. This body of analysis suggests that the expression of emergent mass generation is the same in all u, d, and s baryons and, notably, that dynamical quark-quark correlations play an essential role in the structure of each one. Furthermore, it also provides the basis for developing an array of predictions that can be tested in new generation experiments.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1574302

Journal Information:: Physical Review D, Vol. 100, Issue 5; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 23 works

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