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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2010, vol. 82, p. -

Search for charmonium and charmoniumlike states in y (1S) radiative decays

Shen C. P., Wang X. L., Yuan C. Z., Wang P., Adachi I., Aihara H., Aushev T., Bakich A. M., Balagura V., Belous K., Bhardwaj V., Bischofberger M., Bračko M., Browder T. E., Chang M. C., Chen K. F., Chen P., Cheon B. G., Choi Y., Dalseno J., Danilov M., Doleal Z., Eidelman S., Gabyshev N., Ha H., Haba J., Hayasaka K., Hayashii H., Horii Y., Hoshi Y., Hou W. S., Hyun H. J., Inami K., Itoh R., Iwabuchi M., Iwasaki Y., Julius T., Kang J. H., Kawai H., Kawasaki T., Kichimi H., Kiesling C., Kim H. J., Kim M. J., Kim Y. J., Ko B. R., Križlan P., Kuhr T., Kuzmin A., Lange J. S., Lee M. J., Lee S. H., Leitner R., Li J., Liu C., Louvot R., McOnie S., Miyabayashi K., Miyata H., Miyazaki Y., Mohanty G. B., Mussa R., Nakano E., Nakao M., Natkaniec Z., Nishida S., Ohshima T., Okuno S., Olsen S. L., Pakhlova G., Park C. W., Park H., Pestotnik R., Petrič M., Piilonen L. E., Röhrken M., Ryu S., Sakai Y., Schneider O., Schwanda C., Senyo K., Sevior M. E., Shang L., Shapkin M., Shiu J. G., Shwartz B., Smerkol P., Solovieva E., Stanič S.

Using a sample of 102×106 Υ(1S) events collected with the Belle detector, we report on the first search for charge-parity-even charmonium and charmoniumlike states in Υ(1S) radiative decays. No significant χcJ or ηc signal is observed and 90% C.L. limits on B(Υ(1S)→γχc0)<6.5×10⊃-4, B(Υ(1S)→γχc1)<2.3×10⊃-5, B(Υ(1S)→γχc2)<7.6×10⊃-6, and B(Υ(1S)→γηc)<5.7×10⊃-5 are obtained. The product branching fraction limits B(Υ(1S)→γX(3872)) B(X(3872)→π⊃+π⊃-J/ψ)<1.6×10⊃-6, B(Υ(1S)→γX(3872))B(X(3872)→π⊃+π⊃-π0J/ ψ)<2.8×10⊃-6, B(Υ(1S)→γX(3915))B(X(3915) →ωJ/ψ)<3.0×10⊃-6, and B(Υ(1S) →γY(4140))B(Y(4140)→J/ψ)<2.2×10⊃-6 are obtained at the 90% C.L. Furthermore, no evidence is found for excited charmonium states below 4.8GeV/c2. © 2010 The American Physical Society.