[Xiao, Kai] South Cent Univ Nationalities, Coll Elect & Informat Engn, Wuhan 430074, Peoples R China.
[Wang, Fuqiang; Yi, Li] Purdue Univ, Dept Phys & Astron, W Lafayette, IN 47907 USA.
[Wang, Fuqiang; Liu, Feng] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.
[Wang, Fuqiang; Liu, Feng] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
[Yi, Li] Yale Univ, Dept Phys, New Haven, CT USA.