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I Suppression of semileptonic lambda decays

  1. Nov 30, 2016 #1


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    Confused by the branching ratio of uds ---> proton + e- + neutrino compared to uds ---> proton + pion (or neutron + pion).

    In both cases an W boson is being produced as the strange quark changes flavour, and it is either decaying to leptons or first generation quarks - why is the leptonic decay so suppressed? (BR of order 10^-4).

    I can see it must be easier to distribute momentum to two particles of similar mass, but is there a simple way to quantify this without doing the full phase space calculation?
  2. jcsd
  3. Nov 30, 2016 #2


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    Helicity suppression?
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