S -wave baryon nonleptonic decay amplitude in large- N c chiral perturbation theory

The s-wave decay amplitude in the nonleptonic decay of baryons is analyzed within heavy baryon chiral perturbation theory in the large-Nc limit at one-loop order, where Nc 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-Nc cancellations between different one-loop graphs as a consequence of the large-Nc spin-flavor symmetry of QCD baryons. The predictions of large-Nc baryon chiral perturbation theory are in very good agreement both with the expectations from the 1/Nc expansion and with the experimental data. © 2019 authors. Published by the American Physical Society.

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