}(\textbf{q},\omega)=lim_{\eta\rightarrow 0^+}\int \hat{q}\hat{q} \hat{s}\hat{s}d^0s\tilde{R}_{\mu \mu}(\textbf{q}-\textbf{s}) \cdot \ \ \ \ \ \ \ \ \ \ \ \ \ \ \nonumber \\&\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \cdot \frac{0}{\tilde{c}_L^0}\frac{0}{(\tilde{q}_{0L}+i\tilde{\eta})^0-q^0}; \label{