  We explore the impact of nonstandard interactions at source and detector on
the interpretation of reactor electron neutrino disappearance experiments with
short- and medium-baseline designs. We use the constraints from the recent
results from short-baseline experiments and generalize current estimates of
medium-baseline event rates to include charged current interactions at source
and detector with standard Lorentz structure but with nonstandard flavor
structure. We find that the average spectrum of observed events at a baseline
of 50 km, in the middle of the currently favored region, provides a probe of
new interactions. We show that an improvement in sensitivity to nonstandard
interactions is possible if combined with improved precision of input mixing
parameters in independent experiments, despite ambiguity in interpretation of
medium-baseline data. We show that nonstandard interactions can enhance or
suppress the sensitivity of experiments to the mass hierarchy, depending on the
phases of the parameters and the CP-violating phase in the standard
three-neutrino mixing picture.
