In this paper, we consider the neutrino and anti-neutrino emerging from the Z 0 decay and the wave packet quantum mechanical approach is used to obtain the probability of detecting a neutrino of flavor α and the corresponding anti-neutrino of flavor β at the positions L and L ¯, respectively. For this purpose, it is essential to construct a bipartite entangled state of neutrino and anti-neutrino wave packets. The result of this calculation is the same as the result obtained before in quantum field theory approach.
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