  Motivated by the anomaly in the KARMEN experiment, we study new possibilities
for brane-world models of neutrino masses. We show that the KARMEN anomaly can
be understood in the context of a six-dimensional brane-world model. The
fine-tuning problem associated with the single-particle interpretation of the
anomaly is thereby alleviated. Our model shows some interesting properties of
general interest for brane-world neutrino physics. In particular, the size of
the brane-bulk mixing decouples from the scales relevant for atmospheric and
solar neutrino oscillations.
