TeV scale seesaw from supersymmetric Higgs-lepton inflation and BICEP2
  We discuss the physics resulting from the supersymmetric Higgs-lepton
inflation model and the recent CMB B-mode observation by the BICEP2 experiment.
The tensor-to-scalar ratio r=0.20+0.07-0.05 of the primordial fluctuations
indicated by the CMB B-mode polarization is consistent with the prediction of
this inflationary model for natural parameter values. A salient feature of the
model is that it predicts the seesaw mass scale M from the amplitude of the
tensor mode fluctuations. It is found that the 68% (95%) confidence level (CL)
constraints from the BICEP2 experiment give 927 GeV < M < 1.62 TeV (751 GeV < M
< 2.37 TeV) for 50 e-foldings and 391 GeV < M < 795 GeV (355 GeV < M < 1.10
TeV) for 60 e-foldings. In the type I seesaw case, the right-handed neutrinos
in this mass range are elusive in collider experiments due to the small mixing
angle. In the type III seesaw, in contrast, the heavy leptons will be within
the reach of future experiments. We point out that a significant portion of the
parameter region corresponding to the 68% CL of the BICEP2 experiment will be
covered by the Large Hadron Collider experiments at 14 TeV.
