Measurement of ψ(2S) radiative decays

Authors：Ablikim M; Bai J Z; Ban Y; Cai X; Chen H F; Chen H S; Chen H X; Chen J C; Chen Jin; Chen Y B; Chu Y P; Dai Y S; Diao L Y; Deng Z Y; Dong Q F; Du S X; Fang J; Fang S S; Fu C D; Gao C S; Gao Y N; Gu S D; Gu Y T; Guo Y N; Guo Z J; Harris F A; He K L; He M; Heng Y K; Hou J; Hu H M; Hu J H; Hu T; Huang G S; Huang X T; Ji X B; Jiang X S; Jiang X Y; Jiao J B; Jin D P; Jin S; Lai Y F; Li G; Li H B; Li J; Li R Y

Source：2007, v 99, n 1.

DOI：10.1103/PhysRevLett.99.011802

• Branching fractions
• Invariant mass of hadrons
• Radiative decays

Using 14×106 ψ(2S) events accumulated at the BESII detector, we report first measurements of branching fractions or upper limits for ψ(2S) decays into γpp¯, γ2(π+π-), γKS0K+π-+c.c., γK+K-π+π-, γK*0K-π++c.c., γK*0K¯ *0, γπ+π-pp¯, γ2(K+K-), γ3(π+π-), and γ2(π+π-)K+K- with the invariant mass of hadrons below 2.9GeV/c2. We also report branching fractions of ψ(2S) decays into 2(π+π-)π0, ωπ+π-, ωf2(1270), b1±π, and π02(π+π-)K+K-.

• Institution
  university of Toronto; 6; bpotest; 浙江大学; 清华大学; 华中师范大学; United States; 四川大学