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Figure 2: The process ${\overline{Q}}^{\prime }Q\hspace{0.17em}\to \hspace{0.17em}{\overline{Q}}^{\prime \prime \prime }+Q^{\prime \prime }+n(G)$. The four-momenta are indicated in the standard manner: $q_1$ is the four-momentum of the incoming $Q$, $q_2$ is the four-momentum of the outgoing $Q^{\prime \prime }$, and so forth, and $Q=u\mathrm{,}d\mathrm{,}s\mathrm{,}c\mathrm{,}b\mathrm{,}G\mathrm{.}$