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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2012, vol. 86, p. -

Experimental study of ψ ′ decays to K +K -π0 and K +K -η

Ablikim M., Achasov M. N., Albayrak O., Ambrose D. J., An F. F., An Q., Bai J. Z., Ban Y., Becker J., Bennett J. V., Bertani M., Bian J. M., Boger E., Bondarenko O., Boyko I., Briere R. A., Bytev V., 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 Y. B., Cheng H. P., 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 L. Y., Dong M. Y., Du S. X., Fang J., Fang S. S., Fava L., Feldbauer F., Feng C. Q., Ferroli R. B., Fu C. D., Fu J. L., Gao Y., Geng C., Goetzen K., Gong W. X., Gradl W., Greco M., Gu M. H., Gu Y. T., Guan Y. H., Guo A. Q., Guo L. B., Guo Y. P., Han Y. L., Harris F. A., He K. L., He M., He Z. Y., Held T., Heng Y. K., Hou Z. L., Hu H. M., Hu T., Huang G. M., Huang G. S., Huang J. S., Huang X. T., Huang Y. P., Hussain T., Ji C. S., Ji Q., Ji Q. P., Ji X. B., Ji X. L., Jiang L. L., Jiang X. S., Jiao J. B., Jiao Z., Jin D. P., Jin S., Jing F. F., Kalantar-Nayestanaki N.

Using (106±4)×106 ψ ′ events accumulated with the BESIII detector at the BEPCII e+ e- collider, we present measurements of the branching fractions for ψ ′ decays to K +K -π0 and K +K -η. In these final states, the decay ψ ′→K2* (1430)+K -+c.c. is observed for the first time, and its branching fraction is measured to be (7.12±0.62(stat)-0.61+1. 13(syst))×10 -5, which indicates a violation of the helicity selection rule in ψ ′ decays. The branching fractions of ψ ′→K*(892) +K -+c.c., η, and π0 are also measured. The measurements are used to test the QCD predictions on charmonium decays. © 2012 American Physical Society.