We revisit a single-field new inflation model based on a discrete R symmetry .
Interestingly , the inflaton dynamics naturally leads to a heavy gravitino of mass m _ { 3 / 2 } = { \cal O } ( 1 - 100 ) TeV , which is consistent with the standard-model like Higgs boson of mass m _ { h } \simeq 126 GeV .
However , the predicted spectral index n _ { s } \approx 0.94 is in tension with the Planck result , n _ { s } = 0.9603 \pm 0.073 .
We show that the spectral index can be increased by allowing a small constant term in the superpotential during inflation .
The required size of the constant is close to the largest allowed value for successful inflation , and it may be a result of a pressure toward larger values in the landscape .
Alternatively , such constant term may arise in association with supersymmetry breaking required to cancel the negative cosmological constant from the inflaton sector .