Supported by National Natural Science Foundation of China(10491300,10225524,10225525,10425523,10625524,10521003,10821063,10825524);Chinese Academy of Sciences(KJ95T-03);100Talents Program of CAS(U-11,U-24,U-25);Knowledge Innovation Project of CAS(U-602,U-34)(IHEP);National Natural Science Foundation of China(10775077,10225522)(Tsinghua University);Department of Energy(DE-FG02-04ER41291)(U.Hawaii)
Based on 58 million J/ψ events collected by the BESⅡ detector at the BEPC, J/ψ→ΛΛ π+π- is observed for the first time. The branching fraction is measured to be Br(J/ψ→ΛΛ π+π-)=(4.30±0.13±0.99)×1...
Supported by National Natural Science Foundation of China (10491300,10225524,10225525,10425523,10625524,10521003,10821063,10825524);Chinese Academy of Sciences (KJ 95T-03);100 Talents Program of CAS (U-11,U-24,U-25);Knowledge Innovation Project of CAS (U-602,U-34 (IHEP));National Natural Science Foundation of China (10225522 (Tsinghua University))
Using ~ 14 × 10^6 ψ(2S) and ~ 58 × 10^ J/ ψ data collected at BES Ⅱ/BEPC, the branching fraction of ψ(2S)→Ω-Ω^+ is measured with about 5a statistical significance. The A electric dipole and ∧ decay p...
Project supported by the National Natural Science Foundation of China (Grant Nos 10491300,10225524,10225525,10425523,10625524 and 10521003);the Natural Science Foundation of the Chinese Academy of Sciences (Grant No KJ 95T-03)
The CP violation in the D system is predicted to be an unobserved level in the Standard Model. In this paper, we describe the method of searching for CP violation decay processes with the coherently produced D^0D^0 me...
National Natural Science Foundation of China(10491300,10225524,10225525,10425523,10625524,10521003)
We reported the observation of Y(2175) in Фfo(980) mass spectrum in J/ψ → ηФfo(980) with fo(980) →π+π^- and the observation of a broad 1^-- resonance of K^+K^- mass in J/ψ→ K^+K^-π^0. The results...