\begin{document}$Z(2)$\end{document} noise method and the spin-color explicit (SCE) method on a quenched lattice QCD ensemble with lattice volume \begin{document}$12^{3}\times24$\end{document} and lattice spacing \begin{document}$a\approx0.1$\end{document} fm. The results show that the SMP method is very suitable for the calculation of pseudoscalar disconnected quark loops. However, the SMP and SCE methods do not have an obvious advantage over the \begin{document}$Z(2)$\end{document} noise method in the evaluation of the scalar disconnected loops."> Calculation of disconnected quark loops in lattice QCD -
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