Observation of χ(c1) decays into vector meson pairs φφ, ωω, and ωφ

• Published in: Physical review letters 2011-08, Vol.107 (9), p.092001-092001
• Main Authors: Ablikim, M, Achasov, M N, An, L, An, Q, An, Z H, Bai, J Z, Baldini, R, Ban, Y, Becker, J, Berger, N, Bertani, M, Bian, J M, Bondarenko, O, Boyko, I, Briere, R A, Bytev, V, Cai, X, Cao, G F, Cao, X X, Chang, J F, Chelkov, G, Chen, G, Chen, H S, Chen, J C, Chen, M L, Chen, S J, Chen, Y, Chen, Y B, Cheng, H P, Chu, Y P, Cronin-Hennessy, D, Dai, H L, Dai, J P, Dedovich, D, Deng, Z Y, Denysenko, I, Destefanis, M, Ding, Y, Dong, L Y, Dong, M Y, Du, S X, Duan, M Y, Fan, R R, Fang, J, Fang, S S, Feng, C Q, Fu, C D, Fu, J L, Gao, Y, Geng, C, Goetzen, K, Gong, W X, Greco, M, Grishin, S, Gu, M H, Gu, Y T, Guan, Y H, Guo, A Q, Guo, L B, Guo, Y P, Hao, X Q, Harris, F A, He, K L, He, M, He, Z Y, Heng, Y K, Hou, Z L, Hu, H M, Hu, J F, Hu, T, Huang, B, Huang, G M, Huang, J S, Huang, X T, Huang, Y P, Hussain, T, Ji, C S, Ji, Q, Ji, X B, Ji, X L, Jia, L K, Jiang, L L, Jiang, X S, Jiao, J B, Jiao, Z, Jin, D P, Jin, S, Jing, F F, Kavatsyuk, M, Komamiya, S, Kuehn, W, Lange, J S, Leung, J K C, Li, Cheng, Li, Cui, Li, D M, Li, F, Li, G, Li, H B, Li, J C
• Format: Article
• Language: English
• ISSN: 1079-7114

Using (106±4)×10⁻⁶ ψ(3686) events accumulated with the BESIII detector at the BEPCII e⁺e⁻ collider, we present the first measurement of decays of χ(c1) to vector meson pairs φφ, ωω, and ωφ. The branching fractions are measured to be (4.4±0.3±0.5)×10⁻⁴, (6.0±0.3±0.7)×10⁻⁴, and (2.2±0.6±0.2)×10⁻⁵, for χ(c1)→φφ, ωω, and ωφ, respectively, which indicates that the hadron helicity selection rule is significantly violated in χ(cJ) decays. In addition, the measurement of χ(cJ)→ωφ provides the first indication of the rate of doubly OZI-suppressed χ(cJ) decay. Finally, we present improved measurements for the branching fractions of χ(c0) and χ(c2) to vector meson pairs.