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In particle physics, neutral particle oscillation is the transmutation of a particle with zero electric charge into another neutral particle due to a change of a non-zero internal quantum number via an interaction that does not conserve that quantum number. For example, a neutron cannot transmute into an antineutron as that would violate the conservation of baryon number. Such oscillations can be classified into two types: * Particle-antiparticle oscillation (for example, , , - oscillation). * Flavor oscillation (for example, ). In case the particles decay to some final product, then the system is not purely oscillatory, and an interference between oscillation and decay is observed. N.B. It is the probability (of detecting any one of the two particles) that oscillates as a function of distance traveled (or, as a function of time of flight). It is not that the particle itself transmutes periodically as it travels. What propagates is a mixed state and on detection we measure the energy (mass) associated with any one of its pure states; and what oscillates is the probability of obtaining a particular energy (mass) as a result of measurement on the mixed state. == History and motivation == 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Neutral particle oscillation」の詳細全文を読む スポンサード リンク
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