\langle {{\cal Q}}^{\rm em}_R u^\mu \rangle
 + K_5 \; \langle[({{\cal Q}}^{\rm em}_L)^2 + ({{\cal Q}}^{\rm em}_R)^2] 
u_\mu u^\mu\rangle {\nonumber}\\
&& \mbox{} + K_6 \; \langle ({{\cal Q}}^{\rm em}_L {{\cal Q}}^{\rm em}_R + 
{{\cal Q}}^{\rm em}_R {{\cal Q}}^{\rm em}_L) u_\mu u^\mu\rangle 
 + \frac{1}{2} K_7 \; \langle ({{\cal Q}}^{\rm em}_L)^2 
+ ({{\cal Q}}^{\rm em}_R)^2\rangle \; \langle \chi_+\rangle
{\nonumber}\\
&& \mbox{} + K_8\; \langle {{\cal Q}}^{\rm em}_L {{\cal Q}}^{\rm em}_R\rangle 
\; \langle \chi_+\rangle 
+ K_9 \; \langle [({{\cal Q}}^{\rm em}_L)^2 + ({{\cal Q}}^{\rm em}_R)^2] 
\chi_+\rangle {\nonumber}\\
&& \mbox{} + K_{10}\; \langle({{\cal Q}}^{\rm em}_L {{\cal Q}}^{\rm em}_R 
+ {{\cal Q}}^{\rm em}_R {{\cal Q}}^{\rm em}_L) \chi_+\rangle 
 - K_{11} \; \langle({{\cal Q}}^{\rm em}_L {{\cal Q}}^{\rm em}_R 
- {{\cal Q}}^{\rm em}_R {{\cal Q}}^{\rm em}_L) \chi_-\rangle {\nonumber}\\
&& \mbox{}- iK_{12}\; \langle[({\widehat}\nabla_\mu {{\cal Q}}^{\rm em}_L) {{\cal Q}}^{\rm em}_L -
{{\cal Q}}^{\rm em}_L {\widehat}\nabla_\mu {{\cal Q}}^{\rm em}_L 
- ({\widehat}\nabla_\mu {{\cal Q}}^{\rm em}_R) {{\cal Q}}^{\rm em}_R + 
{{\cal Q}}^{\rm em}_R {\widehat}\nabla_\mu {{\cal Q}}^{\rm em}_R] u^\mu\rangle {\nonumber}\\
&&  \mbox{}+ K_{13} \; \langle ({\widehat}\nabla_\mu {{\cal Q}}^{\rm em}_L) 
({\widehat}\nabla^\mu {{\cal Q}}^{\rm em}_R) \rangle  {\nonumber}\\
&& \left. \mbox{} + K_{14} \; \langle ({\widehat}\nabla_\mu {{\cal Q}}^{\rm em}_L) 
({\widehat}\nabla^\mu {{\cal Q}}^{\rm em}_L) +
({\widehat}\nabla_\mu {{\cal Q}}^{\rm em}_R) ({\widehat}\nabla^\mu {{\cal Q}}^{\rm em}_R)\rangle  
\right\}, \end{aligned}$$ where $$\begin{aligned}
 \label{eq:covder1}
{\widehat}\nabla_\mu 