Nucleon axial couplings and [(1/2,0) + (0,1/2)]-[(1,1/2) + (1/2,1)] chiral multiplet mixing

TL;DR

This paper investigates the mixing of specific chiral multiplets in nucleons to predict axial couplings and baryon resonance masses, aligning theoretical models with experimental data.

Contribution

It introduces a novel approach to fit nucleon axial couplings using chiral multiplet mixing and predicts a new baryon resonance mass.

Findings

Predicted isoscalar axial coupling g_A(0) aligns with experimental values.

Estimated third J=1/2 resonance at 2030 MeV.

Demonstrated the effectiveness of chiral multiplet mixing in baryon property predictions.

Abstract

Three-quark nucleon interpolating fields in QCD have well-defined SU_L(2) x SU_R(2) and U_A(1) chiral transformation properties. Mixing of the [(1,1/2) + (1/2,1)] chiral multiplet with one of [(1/2,0) + (0,1/2)] or [(0,1/2) + (1/2,0)] representation can be used to fit the isovector axial coupling g_A(1) and thus predict the isoscalar axial coupling g_A(0) of the nucleon, in reasonable agreement with experiment. We also use a chiral meson-baryon interaction to calculate the masses and one-pion-interaction terms of J=1/2 baryons belonging to the [(0,1/2) + (1/2,0)] and [(1,1/2) + (1/2,1)] chiral multiplets and fit two of the diagonalized masses to the lowest-lying nucleon resonances thus predicting the third J=1/2 resonance at 2030 MeV, not far from the (one-star PDG) state Delta(2150).