Parity partners in the baryon resonance spectrum

Ya Lu, Chen Chen, Craig D. Roberts, Jorge Segovia, Shu-Sheng Xu, and Hong-Shi Zong
Phys. Rev. C 96, 015208 – Published 28 July 2017

Abstract

We describe a calculation of the spectrum of flavor-SU(3) octet and decuplet baryons, their parity partners, and the radial excitations of these systems, made using a symmetry-preserving treatment of a vector × vector contact interaction as the foundation for the relevant few-body equations. Dynamical chiral symmetry breaking generates nonpointlike diquarks within these baryons and hence, using the contact interaction, flavor-antitriplet scalar, pseudoscalar, vector, and flavor-sextet axial-vector quark-quark correlations can all play active roles. The model yields reasonable masses for all systems studied and Faddeev amplitudes for ground states and associated parity partners that sketch a realistic picture of their internal structure: ground-state, even-parity baryons are constituted, almost exclusively, from like-parity diquark correlations, but orbital angular momentum plays an important role in the rest-frame wave functions of odd-parity baryons, whose Faddeev amplitudes are dominated by odd-parity diquarks.

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  • Received 10 May 2017

DOI:https://doi.org/10.1103/PhysRevC.96.015208

©2017 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
  1. Physical Systems
Nuclear PhysicsParticles & Fields

Authors & Affiliations

Ya Lu1,*, Chen Chen2,†, Craig D. Roberts3,‡, Jorge Segovia4,§, Shu-Sheng Xu1,∥, and Hong-Shi Zong1,5,¶

  • 1Department of Physics, Nanjing University, Nanjing, Jiangsu 210093, China
  • 2Instituto de Física Teórica, Universidade Estadual Paulista, Rua Dr. Bento Teobaldo Ferraz, 271, 01140-070 São Paulo, São Paulo, Brazil
  • 3Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 4Physik-Department, Technische Universität München, James-Franck-Strasse 1, D-85748 Garching, Germany
  • 5Joint Center for Particle, Nuclear Physics and Cosmology, Nanjing, Jiangsu 210093, China

  • *luya@smail.nju.edu.cn
  • chenchen@ift.unesp.br
  • cdroberts@anl.gov
  • §jorge.segovia@tum.de
  • xuss@nju.edu.cn
  • zonghs@nju.edu.cn

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Issue

Vol. 96, Iss. 1 — July 2017

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