# Feynman diagram for pi-0 decay

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1. Jan 19, 2014

1. The problem statement, all variables and given/known data
Hey guys, so I'm new to Feynman diagrams, and I have a few to draw but i'll start with the first one.

I'm being asked to draw the following process: $\pi^{0}$(uu* or bb*)$→\gamma +\gamma$. I have to "clearly label each quark, lepton and boson, and say which fundamental force is involved".

2. Relevant equations

None

3. The attempt at a solution

So I have no idea what to do with this. Ive done some reading about Feynman diagrams but i dont know how to work with individual quarks...

2. Jan 19, 2014

### strangerep

If, instead, you were asked to draw the Feynman diagram for electron-positron annihilation, i.e.,
$$e^- + e^+ ~\to~ \gamma + \gamma ~,$$are you be able to do that?

If not, then... which textbook(s) are you learning from?