2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/220400The rigorous on-shell $T$-matrices for $NN$ scattering in the coupled channels $^3S_1$$-$$^3D_1$ are briefly presented in the context of EFT($\notπ$) with the contact potentials truncated at order $Δ=4$. The nonperturbative features of renormalization are highlighted and elaborated. A simple scenario for EFT power counting's and renormalization prescriptions is also presented with its consequences being roughly analyzed and discussed.5 pages, no figureNuclear TheoryHigh Energy Physics - Phenomenologytext