Chapter 44, Problem 44.23E

(a)

To determine

Whether the lepton numbers are conserved in the decay ${\mu }^{-}\to {\text{e}}^{-}+{\nu }_{\text{e}}+\overline{{\nu }_{\mu }}$ or not.

(b)

To determine

Whether the lepton numbers are conserved in the decay ${\tau }^{-}\to {\text{e}}^{-}+\overline{{\nu }_{\text{e}}}+{\nu }_{\tau }$ or not.

(c)

To determine

Whether the lepton numbers are conserved in the decay ${\pi }^{+}\to {\text{e}}^{+}+\gamma$ or not.

(d)

To determine

Whether the lepton numbers are conserved in the decay $\text{n}\to \text{p}+{\text{e}}^{-}+\overline{{\nu }_{\text{e}}}$ or not.