[1] Shanghai Jiao Tong Univ, Tsung Dao Lee Inst, Shanghai 200240, Peoples R China
[2] Shanghai Jiao Tong Univ, Key Lab Particle Astrophys & Cosmol MOE, Shanghai Key Lab Particle Phys & Cosmol, Sch Phys & Astron, Shanghai 200240, Peoples R China
[3] Tsinghua Univ, Inst Modern Phys, Beijing 100084, Peoples R China
[4] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China
[5] Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China