Abstract
We investigate the combined effect of neutrino masses and non-standard couplings on the various lepton spectra in μ and τ decays. We emphasize the energy spectra of the neutrinos, which can be measured by secondary reactions in the new KARMEN experiment and hence will yield novel information on deviations from the VA structure. To constrain these couplings, QED radiative corrections have to be taken into account. We evaluated them and found small corrections to the neutrino spectra.
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