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Chiral Lagrangian for baryons in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mfrac><mml:mrow><mml:mn>1</mml:mn></mml:mrow><mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>N</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:mrow></mml:mfrac></mml:math>expansion
A $\frac{1}{{N}_{c}}$ expansion of the chiral Lagrangian for baryons is formulated and used to study the low-energy dynamics of baryons interacting with the pion nonet $\ensuremath{\pi}$, $K$, $\ensuremath{\eta}$, and ${\ensuremath{\eta}}^{\ensuremath{'}}$ in a combined expansion in chiral symmetry breaking and $\frac{1}{{N}_{c}}$. Strong $\mathrm{CP}$ violation is included. The chiral Lagrangian correctly implements …