Possible Tests of C st and T st Invariances in l +/- +N-->l +/- +Γ and A-->B+e + +e -

A systematic method to test the ${C}_{\mathrm{st}}$ and ${T}_{\mathrm{st}}$ invariances of the electromagnetic interaction is to use the inelastic scattering ${l}^{\ifmmode\pm\else\textpm\fi{}}+N\ensuremath{\rightarrow}{l}^{\ifmmode\pm\else\textpm\fi{}}+\ensuremath{\Gamma}$ where ${l}^{\ifmmode\pm\else\textpm\fi{}}$ is the charged lepton, $N$ is the target nucleus (or nucleon), and $\ensuremath{\Gamma}\ensuremath{\ne}N$ but, otherwise, can be any system of the strongly interacting particles. General expressions for the various possible ${C}_{\mathrm{st}}$- and ${T}_{\mathrm{st}}$-noninvariant effects in such reactions are derived and discussed. Similar considerations are also applied to the decay $A\ensuremath{\rightarrow}B+{e}^{+}+{e}^{\ensuremath{-}}$, where $A$ and $B$ are any complexes of the strongly interacting particles.