BESⅢ data show a particular angular distribution for the decay of J/Ψ and Ψ(2 S) mesons into ■ and Σ~0Σ~0 hyperons: the angular distribution of the decay Ψ(2 S) →Σ~0Σ~0 exhibits an opposite trend with respec...
Supported by National Natural Science Foundation of China (10979012)
Based on the branching fractions of J/ψ(ψ(2S))→ VP from different collaborations, pseudoscalar mixing is extensively discussed with a well established phenomenological model. The mixing angle is determined to b...
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...
Supported by EU 6th Framework Programme under contract MRTN-CT-2006-035482 (FLAVIAnet);EU Research Programmes at LNF,FP7,Transnational Access to Research Infrastructure (TARI),Hadron Physics2-Integrating Activity,Contract No.227431
We discuss interference effects important for the form factors extraction in the vicinity of J/ψ and ψ(2S) resonances in combination with resonance parameters determination. The implementation to the Monte Carlo e...
Supported by the National Natural Science Foundation of China, and the Youth Innovation Project of IHEP.
An analysis of the helicity amplitude is performed on the process e^+e^- ψ(2S) → γχcJ→γ∧∧^-→γpπ^-p^-π^+. The joint angular distributions for each decay chain are given, and we focus on discussing the E...
Supported by NSFC, and Youth Innovation Project of IHEP
The π^+π^ transition of heavy quarkonia in decay ψ(2S) →π^+π^-J/ψ is studied. With the BESII data on the decay ψ(2S) →π^+π^-J/ψ, we update the values of coupling constants (gi) and chromopolarizab...