The decay $\pi ^ { - } \rightarrow \mu ^ { - } + \bar { v } _ { \mu } + \bar { \nu } _ { e }$ is not possible because A)L_e is not conserved. B)L _$\mu$ is not conserved. C)quark number is not conserved. D)all of the above are not conserved. E)only L_e and L _$\mu$ are not conserved.

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The Answer of The decay $\pi ^ { - } \rightarrow \mu ^ { - } + \bar { v } _ { \mu } + \bar { \nu } _ { e }$ is not possible because A)L_e is not conserved. B)L _$\mu$ is not conserved. C)quark number is not conserved. D)all of the above are not conserved. E)only L_e and L _$\mu$ are not conserved.

The Decay π−→μ−+vˉμ+νˉe\pi ^ { - } \rightarrow \mu ^ { - } + \bar { v } _ { \mu } + \bar { \nu } _ { e }π−→μ−+vˉμ​+νˉe​

The Decay $\pi ^ { - } \rightarrow \mu ^ { - } + \bar { v } _ { \mu } + \bar { \nu } _ { e }$