Parity partners in the baryon resonance spectrum

Autor(es)

Lu, Ya ; Chen, Chen ; Roberts, Craig D. ; Segovia, Jorge ; Xu, Shu-Sheng ; Zong, Hong-Shi

• Tipo de documento: Artigo Científico
• Fonte: PHYSICAL REVIEW C; v. 96, n. 1, p. 11-pg., 2017-07-28.

Resumo

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 x 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. (AU)

• Processo FAPESP: 15/21550-4 - QCD Forte no Continuo: Massas e Estrutura Partonia de Barions
• Beneficiário: Chen Chen
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado