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arXiv · 1104.5068

Observation of $\chi_{c1}$ decays into vector meson pairs $\phi\phi$, $\omega\omega$, and $\omega\phi$

M. Ablikim·M. N. Achasov·L. An·Q. An·Z. H. An·J. Z. Bai·R. Baldini·Y. Ban·J. Becker·N. Berger·M. Bertani·J. M. Bian·O. Bondarenko·I. Boyko·R. A. Briere·V. Bytev·X. Cai·G. F. Cao·X. X. Cao·J. F. Chang·G. Chelkova·G. Chen·H. S. Chen·J. C. Chen·M. L. Chen·S. J. Chen·Y. Chen·Y. B. Chen·H. P. Cheng·Y. P. Chu·D. Cronin-Hennessy·H. L. Dai·J. P. Dai·D. Dedovich·Z. Y. Deng·I. Denysenkob·M. Destefanis·Y. Ding·L. Y. Dong·M. Y. Dong·S. X. Du·M. Y. Duan·R. R. Fan·J. Fang·S. S. Fang·C. Q. Feng·C. D. Fu·J. L. Fu·Y. Gao·C. Geng·K. Goetzen·W. X. Gong·M. Greco·S. Grishin·M. H. Gu·Y. T. Gu·Y. H. Guan·A. Q. Guo·L. B. Guo·Y. P. Guo·X. Q. Hao·F. A. Harris·K. L. He·M. He·Z. Y. He·Y. K. Heng·Z. L. Hou·H. M. Hu·J. F. Hu·T. Hu·B. Huang·G. M. Huang·J. S. Huang·X. T. Huang·Y. P. Huang·T. Hussain·C. S. Ji·Q. Ji·X. B. Ji·X. L. Ji·L. K. Jia·L. L. Jiang·X. S. Jiang·J. B. Jiao·Z. Jiao·D. P. Jin·S. Jin·F. F. Jing·M. Kavatsyuk·S. Komamiya·W. Kuehn·J. S. Lange·J. K. C. Leung·Cheng Li·Cui Li·D. M. Li·F. Li·G. Li·H. B. Li·J. C. Li
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Abstract

Decays of $\chi_{c1}$ to vector meson pairs $\phi\phi$, $\omega\omega$ and $\omega\phi$ are observed for the first time using $(106\pm4)\times 10^6$ $\psip$ events accumulated at the BESIII detector at the BEPCII $e^+e^-$ collider. The branching fractions are measured to be $(4.4\pm 0.3\pm 0.5)\times 10^{-4}$, $(6.0\pm 0.3\pm 0.7)\times 10^{-4}$, and $(2.2\pm 0.6\pm 0.2)\times 10^{-5}$, for $\chi_{c1}\to \phi\phi$, $\omega\omega$, and $\omega\phi$, respectively. The observation of $\chi_{c1}$ decays into a pair of vector mesons $\phi\phi$, $\omega\omega$ and $\omega\phi$ indicates that the hadron helicity selection rule is significantly violated in $\chi_{cJ}$ decays. In addition, the measurement of $\chi_{cJ}\to \omega\phi$ gives the rate of doubly OZI-suppressed decay. Branching fractions for $\chi_{c0}$ and $\chi_{c2}$ decays into other vector meson pairs are also measured with improved precision.

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M. Ablikim, M. N. Achasov, L. An, Q. An, Z. H. An, J. Z. Bai, R. Baldini, Y. Ban, J. Becker, N. Berger, M. Bertani, J. M. Bian, O. Bondarenko, I. Boyko, R. A. Briere, V. Bytev, X. Cai, G. F. Cao, X. X. Cao, J. F. Chang, G. Chelkova, G. Chen, H. S. Chen, J. C. Chen, M. L. Chen, S. J. Chen, Y. Chen, Y. B. Chen, H. P. Cheng, Y. P. Chu, D. Cronin-Hennessy, H. L. Dai, J. P. Dai, D. Dedovich, Z. Y. Deng, I. Denysenkob, M. Destefanis, Y. Ding, L. Y. Dong, M. Y. Dong, S. X. Du, M. Y. Duan, R. R. Fan, J. Fang, S. S. Fang, C. Q. Feng, C. D. Fu, J. L. Fu, Y. Gao, C. Geng, K. Goetzen, W. X. Gong, M. Greco, S. Grishin, M. H. Gu, Y. T. Gu, Y. H. Guan, A. Q. Guo, L. B. Guo, Y. P. Guo, X. Q. Hao, F. A. Harris, K. L. He, M. He, Z. Y. He, Y. K. Heng, Z. L. Hou, H. M. Hu, J. F. Hu, T. Hu, B. Huang, G. M. Huang, J. S. Huang, X. T. Huang, Y. P. Huang, T. Hussain, C. S. Ji, Q. Ji, X. B. Ji, X. L. Ji, L. K. Jia, L. L. Jiang, X. S. Jiang, J. B. Jiao, Z. Jiao, D. P. Jin, S. Jin, F. F. Jing, M. Kavatsyuk, S. Komamiya, W. Kuehn, J. S. Lange, J. K. C. Leung, Cheng Li, Cui Li, D. M. Li, F. Li, G. Li, H. B. Li, J. C. Li. 2011-04-27. Observation of $\chi_{c1}$ decays into vector meson pairs $\phi\phi$, $\omega\omega$, and $\omega\phi$. https://doi.org/10.1103/physrevlett.107.092001

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