  In this work, we analytically calculate the spectra of primordial
perturbations at the end of Type III hilltop inflation models under the
slow-roll approximation. We examine the one-loop corrections of the spectra and
find that those from the inflaton self-interaction are negligible. On the
contrary, the loop effects from the interaction between the inflaton field and
the waterfall field can be significant when the vacuum expectation value of the
waterfall field is small. The implications are discussed.

Cosmology and Nongalactic Astrophysics;High Energy Physics - Phenomenology;High Energy Physics - Theory