Strong vs Weak Decay

  1. I read in my textbook that a decay process involving the strong interaction has a very short lifetime (10^-23s) whereas a decay process involving the weak interaction has a longer lifetime (10^-10s). Why is this?
     
  2. jcsd
  3. That's because the weak interaction is weaker (hence the name)
     
  4. If you check a source like wikipedia on the strong and weak force, you'll find they atre involved in quite different action phenomena.....

    What is a 'decay process' involving the strong force?
     
  5. Bill_K

    Bill_K 4,160
    Science Advisor

    For example, this paper mentions ∑0(1385) → Λ + π0 as a strong decay, taking place in 10-23 sec and mediated by a gluon.
     
  6. Qualitatively, you may think that the weak force is weaker, so the system evolves more slowly, thus takes longer time to decay.
    Or, in other words, weaker force corresponds to lower energy process, i.e. the time evolution ##e^{-iEt}## is slow .
     
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