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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2008, vol. 77, p. -

Observation of e+e-→K+K-J/ψ via initial-state radiation at Belle

Yuan C. Z., Shen C. P., Wang P., Wang X. L., Adachi I., Aihara H., Arinstein K., Aulchenko V., Aushev T., Bakich A. M., Balagura V., Barberio E., Belous K., Bitenc U., Bondar A., Bračko M., Brodzicka J., Browder T. E., Chao Y., Chen A., Chen W. T., Cheon B. G., Chistov R., Cho I. S., Choi Y., Dalseno J., Danilov M., Das A., Dash M., Eidelman S., Epifanov D., Gabyshev N., Golob B., Ha H., Haba J., Hayasaka K., Hazumi M., Heffernan D., Hokuue T., Hoshi Y., Hou W. S., Hyun H. J., Inami K., Ishikawa A., Ishino H., Itoh R., Iwasaki Y., Kah D. H., Kang J. H., Kawai H., Kawasaki T., Kichimi H., Kim Y. J., Kinoshita K., Korpar S., Križan P., Krokovny P., Kumar R., Kuo C. C., Kuzmin A., Kwon Y. J., Lee M. J., Lee S. E., Lesiak T., Lin S. W., Liventsev D., Mandl F., Matyja A., McOnie S., Medvedeva T., Mitaroff W., Miyabayashi K., Miyake H., Miyata H., Miyazaki Y., Mizuk R., Mohapatra D., Moloney G. R., Nagasaka Y., Nakao M., Nishida S., Nitoh O., Noguchi S., Nozaki T., Ogawa S., Ohshima T., Okuno S., Olsen S. L., Pakhlov P., Pakhlova G., Park C. W., Park H., Peak L. S., Piilonen L. E.

The process e+e-→K+K-J/ψ is observed for the first time via initial-state radiation. The cross section of e+e-→K+K-J/ψ for center-of-mass energies between threshold and 6.0 GeV is measured using 673fb-1 of data collected with the Belle detector on and off the Υ(4S) resonance. No significant signal for Y(4260)→K+K-J/ψ is observed, and we determine B(Y(4260)→K+K-J/ψ)Γ(Y(4260)→e+e-)<1.2eV/c2 at a 90% confidence level. We also find evidence for e+e-→KS0KS0J/ψ in the same data sample. © 2008 The American Physical Society.