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Quark decay

  1. Aug 21, 2014 #1
    1. The problem statement, all variables and given/known data

    One of the following equations represent a possible decay of the K + kaon.
    K+ → π+ + π0
    K+ → μ+ + νμ
    State, with a reason, which one of these decays is not possible.

    3. The attempt at a solution

    At first i thought the first decay was not possible, however, i recently learned that strange quarks decay in to other quarks ( I am aware that a +kaon is made up of and up quark and anti-strange quark). I say other quarks because I'm not sure which either a strange quark or anti-strange quark decay into. After some further calculations i realised that the second decay is not possible as lepton numbers are not conserved.

    So request is, could i have some information on strange quark decay at an A level standard. For some reason i can't find anything in my text book.
  2. jcsd
  3. Aug 21, 2014 #2


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    Both of the decays are possible. As long as the νμ is a neutrino and not an anti-neutrino, it does not break lepton number.

    The branching ratio to the first decay is around 21% and to the second around 64%. See http://pdg.lbl.gov/2013/listings/rpp2013-list-K-plus-minus.pdf
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