2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/191064We calculate the leading contribution to the weak $ΛΛK$ coupling in heavy baryon chiral perturbation theory, including the SU(3) breaking terms arising at one-loop. This coupling gives the leading one-boson exchange amplitude for the process $ΛΛ\toΛn$ and is an important component in understanding the decay of $ΛΛ$-hypernuclei. We find the S-wave and P-wave amplitudes to be stable under one-loop corrections, but the associated errors become large. We discuss the theoretical errors and potential effects of higher order terms.13 pages, 5 figures, latexNuclear Theorytext