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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2011, vol. 84, p. -

Search for charmonium and charmoniumlike states in radiative decays

Wang X. L., Shen C. P., Yuan C. Z., Wang P., Adachi I., Aihara H., Asner D. M., Aushev T., Bakich A. M., Barberio E., Belous K., Bhuyan B., Bozek A., Bračko M., Browder T. E., Chang M. C., Chen A., Cheon B. G., Chilikin K., Cho I. S., Cho K., Choi Y., Dalseno J., Danilov M., Doleal Z., Eidelman S., Fast J. E., Feindt M., Gaur V., Goh Y. M., Haba J., Hayasaka K., Hayashii H., Hoshi Y., Hsiung Y. B., Hyun H. J., Iijima T., Ishikawa A., Itoh R., Iwabuchi M., Iwasaki Y., Iwashita T., Julius T., Kang J. H., Katayama N., Kawasaki T., Kichimi H., Kim H. J., Kim H. O., Kim J. B., Kim J. H., Kim K. T., Kim M. J., Kim Y. J., Kinoshita K., Ko B. R., Kobayashi N., Koblitz S., Krian P., Kuzmin A., Kwon Y. J., Lange J. S., Lee S. H., Li J., Li X. R., Li Y., Libby J., Lim C. L., Liu C., Liventsev D., Louvot R., Matvienko D., McOnie S., Miyabayashi K., Miyata H., Miyazaki Y., Mohanty G. B., Mussa R., Nagasaka Y., Nakao M., Nakazawa H., Natkaniec Z., Neubauer S., Nishida S., Nishimura K., Nitoh O., Ogawa S., Ohshima T., Okuno S., Olsen S. L., Onuki Y., Pakhlov P., Pakhlova G., Park H., Park H. K.

Using a sample of 158×106 Υ(2S) events collected with the Belle detector, charmonium and charmoniumlike states with even charge parity are searched for in Υ(2S) radiative decays. No significant χ cJ or η c signal is observed, and the following upper limits at 90% confidence level (C. L.) are obtained: B(Υ(2S) →γχ c0)<1.0×10 -4, B(Υ(2S)→γχ c1)<3.6×10 -6, B(Υ(2S)→γχ c2)<1.5×10 -5, and B(Υ(2S)→γη c)<2.7×10 -5. No significant signal of any charmoniumlike state is observed, and we obtain the limits B(Υ(2S)→γX(3872))×B(X(3872)→π +π -J/ψ)<0.8×10 -6, B(Υ(2S)→γX(3872))×B(X(3872)→π +π -π0J/ψ)<2.4×10 -6, B(Υ(2S) →γX(3915))×B(X(3915)→ωJ/ψ)<2.8×10 -6, B(Υ(2S)→γY(4140))×B(Y(4140)→J/ψ)) <1.2×10 -6, and B(Υ(2S)→γX(4350)) ×B(X(4350)→J/ψ))<1.3×10 -6 at 90% C. L. © 2011 American Physical Society.