Abstract
The superficially negative mass square of the electron neutrino recently reported in several tritium β-decay experiments can be explained by a possible effect of the weak neutral current interaction of the produced neutrino with quarks in the nucleus, which has previously been predicted. The effect may present a serious obstacle to precise measurements of the neutrino mass within the accuracy of a few eV but, once established experimentally, it may be very useful to measure the weak mixing angle and the quark density in various nuclei.
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