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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2011, vol. 107, p. -

Observation of χc1 decays into Vector Meson Pairs ÏÏ, ωω, and ωï

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.

Using (106±4)×106 ψ(3686) events accumulated with the BESIII detector at the BEPCII e+e- collider, we present the first measurement of decays of χc1 to vector meson pairs ÏÏ, ωω, and ωÏ. 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 χc1→Ï Ï, ωω, and ωÏ, respectively, which indicates that the hadron helicity selection rule is significantly violated in χcJ decays. In addition, the measurement of χcJ→ωÏ provides the first indication of the rate of doubly OZI-suppressed χcJ decay. Finally, we present improved measurements for the branching fractions of χc0 and χc2 to vector meson pairs. © 2011 American Physical Society.