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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2012, vol. 85, p. -

Search for double charmonium decays of the P-wave spin-triplet bottomonium states

Shen C. P., Yuan C. Z., Iijima T., Adachi I., Aihara H., Arinstein K., Asner D. M., Aushev T., Bakich A. M., Bhuyan B., Bischofberger M., Bozek A., Bračko M., Browder T. E., Chang M. C., Chen A., Cheon B. G., Chilikin K., Chistov R., Cho I. S., Cho K., Choi S. K., Choi Y., Dalseno J., Drásal Z., Drutskoy A., Eidelman S., Fast J. E., Gaur V., Gabyshev N., Garmash A., Goh Y. M., Haba J., Hara T., Hayasaka K., Hayashii H., Horii Y., Hoshi Y., Hou W. S., Hyun H. J., Ishikawa A., Itoh R., Iwabuchi M., Iwashita T., Julius T., Kang J. H., Kawasaki T., Kim H. J., Kim H. O., Kim J. B., Kim K. T., Kim M. J., Kim Y. J., Ko B. R., Koblitz S., Kody P., Korpar S., Krian P., Krokovny P., Kumita T., Kwon Y. J., Lange J. S., Lee S. H., Li J., Libby J., Lim C. L., Liu C., Liu Z. Q., Liventsev D., Louvot R., McOnie S., Miyabayashi K., Miyata H., Miyazaki Y., Mizuk R., Mohanty G. B., Moll A., Mori T., Muramatsu N., Mussa R., Nakano E., Nakao M., Nakazawa H., Nishida S., Nishimura K., Nitoh O., Ogawa S., Ohshima T., Okuno S., Olsen S. L., Onuki Y., Pakhlova G., Park C. W.

Using a sample of 158×106 Υ(2S) events collected with the Belle detector, we search for the first time for double-charmonium decays of the P-wave spin-triplet bottomonium states (Υ(2S) →γχ bJ, χ bJ→J/ψJ/ψ, J/ψψ ′, ψ ′ψ ′ for J=0, 1, and 2). No significant χ bJ signal is observed in the double-charmonium mass spectra, and we obtain the following upper limits: B(χ bJ→J/ψJ/ψ)<7.1×10 -5, 2.7×10 -5, 4.5×10 -5, B(χ bJ→ J/ψψ ′)<1.2×10 -4, 1.7×10 -5, 4.9×10 -5, B(χ bJ→ψ ′ψ ′)<3. 1×10 -5, 6.2×10 -5, 1.6×10 -5 for J=0, 1, and 2, respectively, at the 90% confidence level. These limits are significantly lower than the central values (with uncertainties of 50% to 70%) predicted using the light cone formalism but are consistent with calculations using the nonrelativistic QCD (NRQCD) factorization approach. © 2012 American Physical Society.