Why does the pion^0 decay into two gammas with different spins?

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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.
 
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tsinghua said:
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.

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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