Neutral pion decay

  • Thread starter physguy09
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  • #1
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Main Question or Discussion Point

So I know the neutral pion decays as
[tex] \pi \rightarrow \gamma\gamma [/tex]

my question is though, what forbids this from being an electromagnetic decay? I know it is not decaying via the strong force as there are no quarks resulting from decay. However, I do not see what forbids this from decaying via the EM force, if it is spitting out two gammas, which is the EM force carrier. Parity, G-parity, and Energy are conserved, as well as strangeness and angular momentum, so, what exactly forbids this from being EM?
 

Answers and Replies

  • #2
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What makes you think it isn't an electromagnetic decay?

I would say that it is.
 
  • #3
arivero
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EM it is, but anomaly.
 
  • #4
Hans de Vries
Science Advisor
Gold Member
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It's not forbidden but it would be under conservation of
the axial current density [itex]j_A^\mu[/itex]. (The latter is only conserved
together with the Chern Simons current of the EM field)

Regards, Hans
 
Last edited:

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