China Center of Advanced Science and Technology CCAST;
World Lab.;
P.O. Box 8730;
Beijing 100080;
China;
Institute of High Energy Physics;
the Chinese Academy of Sciences;
P.O. Box 9184;
Beijing 100039;
China Institute of High Energy Physics;
the Chinese Academy of Sciences;
P.O. Box 9184;
Beijing 100039;
China;
single; trajectory; quadrature; new; perturbation; expansion; Green; function;