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Particle decay is the spontaneous process of one elementary particle transforming into other elementary particles. During this process, an elementary particle becomes a different particle with less mass and an intermediate particle such as W boson in muon decay. The intermediate particle then transforms into other particles. If the particles created are not stable, the decay process can continue. ''Particle decay'' is also used to refer to the decay of hadrons. However, the term is not typically used to describe radioactive decay, in which an unstable atomic nucleus is transformed into a lighter nucleus accompanied by the emission of particles or radiation, although the two are conceptually similar. Note that this article uses natural units, where ==Probability of survival and particle lifetime== Particle decay is a Poisson process, and hence the probability that a particle survives for time ''t'' before decaying is given by an exponential distribution whose time constant depends on the particle's velocity: :: :where :: is the mean lifetime of the particle (when at rest), and :: is the Lorentz factor of the particle. 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「particle decay」の詳細全文を読む スポンサード リンク
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