**1. The problem statement, all variables and given/known data**
Is the following reaction possible? If so, what is the type of interaction (EM, weak or strong)?

[tex]p+\bar{p}\rightarrow\pi^+ + \pi^- + \pi^0[/tex]

**2. Relevant equations**
Conservation laws and rules of thumb regarding types of interactions.

**3. The attempt at a solution**
I don't think any conservation laws are broken so the process is possible. The question is how exactly. I don't have any idea how to put [itex]\pi^0[/itex] into Feynman diagrams... since its a superposition of two separate quark configurations. I drew the following:

If [itex]\pi^0[/itex] was just [itex]u\bar{u}[/itex] then my question would be whether only changing quark configuration means that it is a strong interaction. And if so, how to draw a Feynman diagram showing what really changed.

But [itex]\pi^0[/itex] is neither it nor [itex]d\bar{d}[/itex] - so what should I do?

Thanks!