Abstract
The electron deficiency observed in beam dump experiments is discussed within the mirror fermion model. We make a general study of the leptonic weak universality and show that only a 4% change in thee/μ-ratio due to non-universal vector/axial vector charged couplings is allowed. In the mirror fermion model this corresponds to the possibility that the electron-like mirror neutrinoNe is very heavy. IfNe is light enough to be produced, oscillation ofve into sterileNe is possible. IfNe is lighter than about 1 MeV, only a 6.5% decrease in thee/μ ratio is allowed, due to the constraints from reactor neutrino experiments. However, if\(m_{N_e } \) is between a couple of MeV's and 45 MeV, only one loose bound exists, allowing thee/μ ratio to decrease by 11%.
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