Higgs inflation is among the most economical and predictive inflation models , although the original Higgs inflation requires tuning the Higgs or top mass away from its current experimental value by more than 2 \sigma deviations , and generally gives a negligible tensor-to-scalar ratio r \sim 10 ^ { -3 } ( if away from the vicinity of critical point ) .
In this work , we construct a minimal extension of Higgs inflation , by adding only two new weak-singlet particles at TeV scale , a vector-quark \mathcal { T } and a real scalar \mathcal { S } .
The presence of singlets ( \mathcal { T } , \mathcal { S } ) significantly impact the renormalization group running of the Higgs boson self-coupling .
With this , our model provides a wider range of the tensor-to-scalar ratio r = \mathcal { O } ( { 0.1 - 10 ^ { -3 } } ) , consistent with the favored r values by either BICEP2 or Planck data , while keeping the successful prediction of the spectral index n _ { s } \simeq 0.96 .
It further allows the Higgs and top masses to fully fit the collider measurements .
We also discuss implications for searching the predicted TeV-scale vector-quark \mathcal { T } and scalar \mathcal { S } at the LHC and future high energy pp colliders .