- #1
vbrasic
- 73
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Homework Statement
I am given the following interaction, $$\pi^-+p\rightarrow \pi^++\pi^-+n,$$ and asked to draw the Feynman (quark flow diagram).
Homework Equations
None; just baryon number conservation, quark flavor conservation, etc.
The Attempt at a Solution
First, as baryon number and quark flavors are all conserved, I deduced that this must be a strong interaction, with pair-production of ##d\bar{d}##. That is, $$d\bar{u}+uud\rightarrow u\bar{d}+d\bar{u}+udd,$$ is the quark composition of the interaction.
From what I can deduce then, the ##\pi^-## remains as is (i.e. ##d\bar{u}\rightarrow d\bar{u}##), while the proton follows the interaction, $$uud\rightarrow u\bar{d}+udd,$$ with the ##d\bar{d}## pair-production, which would be diagrammatically represented by the following Feynman diagram.
Thing is, I'm not entirely sure if my reasoning is correct. Specifically, is the pion in the initial state just a spectator?
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