[1] Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China
[2] Joint Inst Nucl Res, Bogoliubov Lab Theoret Phys, Dubna 141980, Russia
[3] Belarusian State Univ, Res Inst Nucl Problems, Minsk 220030, BELARUS
[4] Sun Yat Sen Univ, Sch Phys & Astron, Zhuhai 519082, Peoples R China