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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2010, vol. 104, p. -

Evidence for a new resonance and search for the Y(4140) in the γγ→φJ/ψ process

Shen C. P., Yuan C. Z., Aihara H., Arinstein K., Aushev T., Bakich A. M., Balagura V., Barberio E., Bay A., Belous K., Bhardwaj V., Bischofberger M., Bračko M., Browder T. E., Chang M. C., Chang P., Chen A., Chen P., Cheon B. G., Chiang C. C., Cho I. S., Choi Y., Dalseno J., Das A., Doležal Z., Drutskoy A., Eidelman S., Epifanov D., Gabyshev N., Golob B., Ha H., Haba J., Han B. Y., Hayasaka K., Hayashii H., Horii Y., Hoshi Y., Hou W. S., Hsiung Y. B., Hyun H. J., Inami K., Itoh R., Iwabuchi M., Iwasaki M., Iwasaki Y., Joshi N. J., Julius T., Kang J. H., Kawasaki T., Kiesling C., Kim H. J., Kim H. O., Kim J. H., Kim S. K., Kim Y. I., Kim Y. J., Ko B. R., Kodyš P., Korpar S., Kreps M., Križan P., Krokovny P., Kuhr T., Kwon Y. J., Kyeong S. H., Lange J. S., Lee M. J., Lee S. H., Li J., Liu C., Liu Y., Liventsev D., Louvot R., Matyja A., McOnie S., Miyabayashi K., Miyata H., Miyazaki Y., Mori T., Mussa R., Nakano E., Nakao M., Nakazawa H., Natkaniec Z., Neubauer S., Nishida S., Nishimura K., Nitoh O., Ohshima T.

The process γγ→φ/ψ is measured using a data sample of 825fb-1 collected with the Belle detector. A narrow peak of 8.8-3.2+4.2 events, with a significance of 3.2 standard deviations including systematic uncertainty, is observed. The mass and natural width of the structure [named X(4350)] are measured to be [4350.6-5.1+4.6(stat)±0.7(syst)]MeV/ c2 and [13-9+18(stat)±4(syst)]MeV, respectively. The product of its two-photon decay width and branching fraction to φJ/ψ is [6.7-2.4+3.2(stat)±1.1(syst)]eV for JP=0+, or [1.5-0.6+0.7(stat)±0.3(syst)]eV for JP=2+. No signal for the Y(4140)→φJ/ψ structure reported by the CDF Collaboration in B→K+φJ/ψ decays is observed, and limits of Γγγ(Y(4140))B(Y(4140)→φJ/ψ)<41eV for JP=0 + or <6.0eV for JP=2+ are determined at the 90% C.L. This disfavors the scenario in which the Y(4140) is a Ds*+Ds*- molecule. © 2010 The American Physical Society.