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I Relative Mean lifetime of decays

  1. Jun 21, 2016 #1
    Hi there.

    I want to compare the mean lifetimes of two particles which decay in a way given by two known reaction formulas, such as

    ##\rho^0 \rightarrow \pi^+ + \pi^-## and ##\Xi^- \rightarrow \Lambda^0 + \pi^-##

    In this case it's easy: since the first one corresponds to a first interaction and the second one to a weak interaction, the first one has a shorter mean lifetime. If, for instance, both were weak, could we still compare the lifetimes (using the particles mass, for example)?
  2. jcsd
  3. Jun 21, 2016 #2


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    2017 Award

    Staff: Mentor

    You can always calculate the lifetime with QFT. If two decays are similar, there might be rules to compare them without a full calculation, but that depends on the specific situation then. The two examples you have here are completely different.
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