Dirac form factors and electric charge radii of baryons in the combined chiral and 1/N-c expansions

作者：Flores Mendieta Ruben^*; Alejandra Rivera Ruiz Mayra

来源：Physical Review D - Particles, Fields, Gravitation and Cosmology, 2015, 92(9): 094026.

DOI：10.1103/PhysRevD.92.094026

The baryon Dirac form factor is computed at one-loop order in large-N-c baryon chiral perturbation theory, where N-c is the number of color charges. Loop graphs with octet and decuplet intermediate states are systematically incorporated into the analysis and the effects of the decuplet-octet mass difference are accounted for. There are large-N-c cancellations between different one-loop graphs as a consequence of the large-N-c spin-flavor symmetry of QCD baryons. As a byproduct, the mean-square charge radius is also computed through a detailed numerical analysis. The predictions of large-N-c baryon chiral perturbation theory are in very good agreement both with the expectations from the 1/N-c expansion and with the experimental data.

• 出版日期2015-11-23