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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 theexperimental data. The experiment needs to reconfirm the results, specificallythe consistency between Planck and BICEP2. On the other hand, the combinedanalysis of Planck and BICEP2 B, including the dust polarization uncertainty,brings down the upper limit on r. In this note, we reexamine the low energyeffective theory of Chromo Natural In ation model and its generalization inview of such observational data. We find that the parameter space of the modeladmits a large value of r as well as other cosmological observables consistentwith data.

A note on Low Energy Effective Theory of Chromo Natural Inflation in the light of BICEP2 results