Masses of ground-state mesons and baryons, including those with heavy quarks

• Autor(a) principal: Yin, Pei-Lin
• Data de Publicação: 2019
• Outros Autores: Chen, Chen [UNESP], Krein, Gastão [UNESP], Roberts, Craig D., Segovia, Jorge, Xu, Shu-Sheng
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1103/PhysRevD.100.034008; http://hdl.handle.net/11449/228717

Using a confining, symmetry-preserving regularization of a vector×vector contact interaction, we compute the spectra of ground-state pseudoscalar and vector (fg) mesons, scalar and axial-vector (fg) diquarks, and JP=1/2+,3/2+ (fgh) baryons, where f,g,h∈{u,d,s,c,b}. The diquark correlations are essentially dynamical and play a key role in formulating and solving the three-valence-quark baryon problems. The baryon spectrum obtained from this largely algebraic approach reproduces the 22 known experimental masses with an accuracy of 2.9(2.4)%. It also possesses the richness of states typical of constituent-quark models, predicting many heavy-quark baryons not yet observed. This study indicates that diquark correlations are an important component of all baryons; and owing to the dynamical character of the diquarks, it is typically the lightest allowed diquark correlation that defines the most important component of a baryon's Faddeev amplitude.