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What is decay length in particle physics?

  1. Feb 27, 2010 #1
    Hi,all, what is decay length in particle physics? I could not find on web, so frustrating. Thanks alot for any helps!
  2. jcsd
  3. Feb 27, 2010 #2
    In nonrelativistic situations, if a particle has a velocity v = βc, and a 1/e decay lifetime τ (e.g., 2.2 microseconds for muon), then the distance the particle will travel before decaying is βcτ.

    For relativistic particles, we need to add time dilation, so the 1/e decay length becomes βγ

    Bob S
  4. Feb 28, 2010 #3
    @Bob S; Thanks alot!
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