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Neutrino oscillation is discussed with emphasis placed more on its conceptual aspects. After reviewing the two conventional formulations, referred to as the equal-energy prescription and the equal-momentum prescription, wave packet treatments are developed for each of these two prescriptions. Both wave packets localized in space and those localized in time are considered, and, by invoking relativistic kinematics as well, the necessary conditions for oscillation to occur are derived, which appear to have a form more well-defined and quantitative than what have been noted before. Some phenomenological implications suggested by the wave packet treatments are briefly mentioned. Finally, as a possible third prescription, the equal-velocity prescription is given.
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Takeuchi et al. (1999) studied this question.
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