How Do You Draw a Feynman Diagram for Pi-0 Decay?

[Dixanadu]

Homework Statement

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".

Homework Equations

None

The Attempt at a Solution

So I have no idea what to do with this. I've done some reading about Feynman diagrams but i don't know how to work with individual quarks...

 

[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?