  In this paper we extend the results proved in (Carlone, R., Correggi, M.,
Finco, D., Teta, A.: A model for Feshbach Resonances arXiv:1901.08282
[math-ph]) about Feshbach resonances in a multichannel Hamiltonian
$\mathcal{H}$, proving a low energy expansion of the resolvent
$(\mathcal{H}-k^{2})^{-1}$ as $k\to 0$ in the resonant case.
