  In this letter, we analyze for the first time the physics reach in terms of
sensitivity to leptonic CP violation of the proposed MuOn-decay MEdium baseline
NeuTrino beam (MOMENT) experiment, a novel neutrino oscillation facility that
would operate with neutrinos from muon decay. Apart from obtaining a
sufficiently intense flux, the bottlenecks to the physics reach of this
experiment will be achieving a high enough suppression of the atmospheric
background and, particularly, attaining a sufficient level of charge
identification. We thus present our results as a function of these two factors.
As for the detector, we consider a very massive Gd-doped Water Cherenkov
detector. We find that MOMENT will be competitive with other currently planned
future oscillation experiments if a charge identification of at least 80 % can
be achieved at the same time that the atmospheric background can be suppressed
by at least a factor of ten. We also find a large synergy of MOMENT with the
current generation of neutrino oscillation experiments, T2K and NOvA, which
significantly enhances its final sensitivity.
