Journal article

Publication year: 2019

Journal: Physical Review D

Volume number: 100

Issue number: 5

ISSN: 2470-0010

eISSN: 2470-0029

Open access status: Green

DOI Link: https://doi.org/10.1103/PhysRevD.100.054009

Publisher: American Physical Society

Abstract: 
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 Xi, Xi*, and Omega 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. It also provides the basis for developing an array of predictions that can be tested in new generation experiments.

Harvard Citation style: Chen, C., Krein, G., Roberts, C., Schmidt, S. and Segovia, J. (2019) Spectrum and structure of octet and decuplet baryons and their positive-parity excitations, Physical Review D, 100(5), Article 054009. https://doi.org/10.1103/PhysRevD.100.054009

APA Citation style: Chen, C., Krein, G., Roberts, C., Schmidt, S., & Segovia, J. (2019). Spectrum and structure of octet and decuplet baryons and their positive-parity excitations. Physical Review D. 100(5), Article 054009. https://doi.org/10.1103/PhysRevD.100.054009