abstract

• The baryon axial vector current is computed at one-loop order in large-N c baryon chiral perturbation theory, where N c is the number of colors. Loop graphs with octet and decuplet intermediate states are systematically incorporated into the analysis and the effects of the decuplet-octet mass difference and SU(3) flavor symmetry breaking are accounted for. As expected, large-N c cancellations between different one-loop graphs are observed as a consequence of the large-N c spin-flavor symmetry of QCD baryons. Fitting our analytical formulas against experimental data on baryon semileptonic decays and the strong decays of decuplet baryons, a detailed numerical analysis regarding the determination of the basic parameters of large-N c baryon chiral perturbation theory as well as the extraction of the baryon axial vector couplings is performed. The large-N c baryon chiral perturbation theory predictions are in very good agreement both with the expectations from the 1/N c expansion and with the experimental data. © 2012 American Physical Society.

authors

• Flores Mendieta Rubén
• Hernández-Ruiz M.A.
• Hofmann C.P.

publication date

• 2012-01-01

published in

• Physical Review D - Particles, Fields, Gravitation and Cosmology  Journal

Digital Object Identifier (DOI)

• 10.1103/PhysRevD.86.094041

start page

end page

volume

• 86

issue

• 9