Corrections to the fluxes of a neutrino factory

Abstract.

To reach their physical goals, future neutrino factories using muon decay aim at an overall flux precision of $\cal O(1\%)$ or better. We analytically study the QED radiative corrections to the neutrino differential distributions from muon decay. Kinematic uncertainties due to the divergence of the muon beam are considered as well. The resulting corrections to the neutrino flux turn out to be of order $\cal O(0.1\%)$, safely below the required precision.