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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2014, vol. 89, p. -

Measurement of the branching fraction for ψ (3686) →ωK+K-

Ablikim M., Achasov M. N., Ai X. C., Albayrak O., Albrecht M., Ambrose D. J., An F. F., An Q., Bai J. Z., Baldini Ferroli R., Ban Y., Bennett D. W., Bennett J. V., Bertani M., Bian J. M., Boger E., Bondarenko O., Boyko I., Braun S., Briere R. A., Cai H., Cai X., Cakir O., Calcaterra A., Cao G. F., Cetin S. A., Chang J. F., Chelkov G., Chen G., Chen H. S., Chen J. C., Chen M. L., Chen S. J., Chen X., Chen X. R., Chen Y. B., Cheng H. P., Chu X. K., Chu Y. P., Cronin-Hennessy D., Dai H. L., Dai J. P., Dedovich D., Deng Z. Y., Denig A., Denysenko I., Destefanis M., Ding W. M., Ding Y., Dong C., Dong J., Dong L. Y., Dong M. Y., Du S. X., Fan J. Z., Fang J., Fang S. S., Fang Y., Fava L., Feng C. Q., Fu C. D., Fuks O., Gao Q., Gao Y., Geng C., Goetzen K., Gong W. X., Gradl W., Greco M., Gu M. H., Gu Y. T., Guan Y. H., Guo L. B., Guo T., Guo Y. P., Haddadi Z., Han S., Han Y. L., Harris F. A., He K. L., He M., He Z. Y., Held T., Heng Y. K., Hou Z. L., Hu C., Hu H. M., Hu J. F., Hu T., Huang G. M., Huang G. S., Huang H. P., Huang J. S., Huang L., Huang X. T., Huang Y., Hussain T.

With 1.06×108 ψ(3686) events collected with the BESIII detector, the branching fraction of ψ(3686)→ωK+K- is measured to be (1.54±0.04±0.11)×10-4. This is the most precise result to date, due to the largest ψ(3686) sample, improved signal reconstruction efficiency, good simulation of the detector performance, and a more accurate knowledge of the continuum contribution. Using the branching fraction of J/ψ→ωK+K-, the ratio B(ψ(3868)→K+K-)/B(J/ψ→K+K- ) is determined to be (18.4±3.7)%. This constitutes a significantly improved test of the 12% rule, with the uncertainty now dominated by the J/ψ branching fraction. © 2014 American Physical Society.