Baryons as solitons in the effective Lagrangian of spontaneously broken chiral symmetry

I present the calculation of the effective Lagrangian from the {σ} quark model based on some reasonable assumptions of the spontaneously broken chiral symmetry, the large-Nc limit, and the nature of the effective action expansion. In addition to the Skyrme Lagrangian with a unique coupling constant e={π}[2(3/Nc{)]}1/2$ and the Wess-Zumino term, it contains an extra new term (${N}c$/96${{{π}}}²$) Tr (${{{∂}}}_{{{μ}}}L^μ{)}²$ which must be treated as a perturbative correction. This new term is responsible for the correct pion form factor corresponding to ${m}_{{{ρ}}}²$=8${{{π}}}²f_π²(3/Nc ). This model can be used to describe the rich low-energy dynamics of baryons and mesons with the unique mass scale f_π.