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Homework Help: Decay of a proton into a positron and a neutral pion

  1. May 10, 2014 #1
    p -> e+ + pi°

    is >10^33 years. what conservation law does this limit test?

    p is uud
    pi° is uu or dd where the second quark of each is an antiquark

    baryon number is not conserved 1 = 0 + 0
    charge is conserved
    lepton number is not conserved 0 = -1 + 0

    not sure what this question is getting at, please could someone give me a point in the right direction? thanks
  2. jcsd
  3. May 10, 2014 #2
    You already answered the question. If that decay is ever observed than the conservation of lepton number and Baryon number will both be violated so that limit is an expression of the validity of those conservations. Conservations are usually tested with limits like that.
  4. May 10, 2014 #3
    great, ok thanks for the reply!
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