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Pion^0 decays two gammas

  1. Jun 24, 2012 #1
    dear all,
    pion^0 particle has a spin 0, but its decayed gamma has spin of 1. why this process could happens?
    Thanks in advance.
  2. jcsd
  3. Jun 24, 2012 #2


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    The spin of a photon is one, but it also has a direction. The spins of the the two photons are antiparallel, so total spin angular momentum is zero, as was the pion.
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