  Polarization transfer (PT) observables in the single pion production induced
by the charged current interaction of the neutrino with the nucleon are
examined. The polarization components of the final nucleon and the charged
lepton are calculated within two models for the pion production. The
predictions are made for neutrino energy of the order of 1~GeV as well as for
the T2K energy distribution. It is demonstrated that the PT observables, the
degree of polarization and the polarization components of outgoing fermions,
are sensitive on assumptions about the nonresonant background model. In
particular it is shown that the normal components of the polarization of the
outgoing nucleon and the lepton are determined by the interference between the
resonant (RES) and nonresonant (NB) amplitudes. Moreover the sign of the normal
component of the polarization of the charged lepton is fixed by the relative
sign between the RES and the NB amplitudes.
