Chapter 44, Problem 44.44P

(a)

To determine

The allowed combinations of ${\pi }^0$, ${\pi }^{+}$ and ${\pi }^{-}$ as the decay products of ${\eta }^0$.

(b)

To determine

The total kinetic energy of the $\pi$ mesons in the decay processes ${\eta }^0\to {\pi }^0+{\pi }^0+{\pi }^0$ and ${\eta }^0\to {\pi }^0+{\pi }^{+}+{\pi }^{-}$.