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Question: 

Draw a possible Feynman diagram using quarks (as in Fig. 32–17c) for the reaction $\pi^-$ + p $\rightarrow \pi^0$ + n.

(c) Quark representation of the same interaction neutron + proton -> neutron + proton. The blue coiled lines between quarks represent gluon exchanges holding the hadrons together.

Figure 32-17 (c) Quark representation of the same interaction $n + p \rightarrow n + p$. The blue coiled lines between quarks represent gluon exchanges holding the hadrons together. (The exchanged meson may be regarded as $\bar{\textrm{u}}\textrm{d}$ emitted by the n and absorbed by the p, or as $\textrm{u}\bar{\textrm{d}}$ emitted by p and absorbed by n, because a u (or d) quark going to the left in the diagram is equivalent to a $\bar{\textrm{u}}$ (or $\bar{\textrm{d}}$) going to the right.)

Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014. Reprinted by permission of Pearson Education Inc., New York.
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Giancoli 7th Edition, Chapter 32, Problem 39

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Chapter 32, Problem 39 is solved.

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