Abstract
The complete renormalization of the weak Lagrangian to chiral order ${q}^{2}$ in heavy baryon chiral perturbation theory is performed using heat kernel techniques. The results are compared with divergences appearing in the calculation of Feynman graphs for the nonleptonic hyperon decay $\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\Lambda}}p{\ensuremath{\pi}}^{\ensuremath{-}}$ and an estimate for the size of the counterterm contributions to the s-wave amplitudes in nonleptonic hyperon decays is given.
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