[Chen, Wei; Wang, Xin-Nian; He, Yayun; Luo, Tan] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China.
[Chen, Wei; Wang, Xin-Nian; He, Yayun; Luo, Tan] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.
[Wang, Xin-Nian; Pang, Long-Gang; He, Yayun] Lawrence Berkeley Natl Lab, Nucl Sci Div, Mailstop 70R0319, Berkeley, CA 94720 USA.
[Cao, Shanshan] Wayne State Univ, Dept Phys & Astron, Detroit, MI 48201 USA.
[Wang, Xin-Nian; Pang, Long-Gang] Univ Calif Berkeley, Phys Dept, Berkeley, CA 94720 USA.