[Luo, Xiaofeng; Xu, Nu; He, Shu] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.
[Luo, Xiaofeng; Xu, Nu; He, Shu] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
[Nara, Yasushi] Akita Int Univ, Akita 0101292, Japan.
[Esumi, ShinIchi] Univ Tsukuba, Ctr Integrated Res Fundamental Sci & Engn, Tsukuba, Ibaraki 305, Japan.
[Xu, Nu] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA.