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pion^0 decays two gammas

 
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Jun24-12, 09:06 PM   #1
 

pion^0 decays two gammas

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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Jun24-12, 09:43 PM   #2
 
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Quote by tsinghua View Post
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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