 \left(\begin{array}{ccc} N' & N & L \\  0 & 0 & 0 \end{array}\right)^{0}  \left\{\begin{array}{ccc} N & N' & L \\ j' & j & S  \end{array} \right\}^0 \nonumber \\ & & \times k_{0 \to L} (T) \end{aligned}$$ 