School of Physics Nanjing University Nanjing 210093 China;
Institute for Nonperturbative Physics Nanjing University Nanjing 210093 China;
European Centre for Theoretical Studies in Nuclear Physics and Related Areas Villa Tambosi Strada delle Tabarelle 286 I-38123 Villazzano (TN) Italy;
School of Physics Nanjing University Nanjing 210093 China;
Institute for Nonperturbative Physics Nanjing University Nanjing 210093 China;
Helmholtz-Zentrum Dresden-Rossendorf Dresden D-01314 Germany;
RWTH Aachen University Ⅲ.Physikalisches Institut B Aachen D-52074 Germany;