  Recent result of BICEP2, revealing a larger value of tensor to scalar ratio
(r), has opened up new investigations of the in ationary models to fit the
experimental data. The experiment needs to reconfirm the results, specifically
the consistency between Planck and BICEP2. On the other hand, the combined
analysis of Planck and BICEP2 B, including the dust polarization uncertainty,
brings down the upper limit on r. In this note, we reexamine the low energy
effective theory of Chromo Natural In ation model and its generalization in
view of such observational data. We find that the parameter space of the model
admits a large value of r as well as other cosmological observables consistent
with data.
