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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2008, vol. 100, p. -

Observation of a resonancelike structure in the π+-ψ′ mass distribution in exclusive B→Kπ+-ψ′ decays

Choi S. K., Olsen S. L., Adachi I., Aihara H., Aulchenko V., Aushev T., Aziz T., Bakich A. M., Balagura V., Bedny I., Bitenc U., Bondar A., Bozek A., Bračko M., Brodzicka J., Browder T. E., Chang P., Chao Y., Chen A., Chen K. F., Chen W. T., Cheon B. G., Chistov R., Choi Y., Dalseno J., Danilov M., Dash M., Eidelman S., Gabyshev N., Golob B., Haba J., Hara T., Hayasaka K., Hayashii H., Hazumi M., Heffernan D., Hoshi Y., Hou W. S., Hyun H. J., Iijima T., Inami K., Ishikawa A., Ishino H., Itoh R., Iwasaki M., Iwasaki Y., Kah D. H., Kang J. H., Katayama N., Kawai H., Kawasaki T., Kichimi H., Kim H. O., Kim S. K., Kim Y. J., Kinoshita K., Križan P., Krokovny P., Kumar R., Kuo C. C., Kuzmin A., Kwon Y. J., Lange J. S., Lee J. S., Lee M. J., Lee S. E., Lesiak T., Limosani A., Lin S. W., Liu Y., Liventsev D., Mandl F., Matyja A., McOnie S., Medvedeva T., Mitaroff W., Miyabayashi K., Miyake H., Miyata H., Miyazaki Y., Mizuk R., Moloney G. R., Nakano E., Nakao M., Nishida S., Nitoh O., Nozaki T., Ogawa S., Ohshima T., Okuno S., Ozaki H., Pakhlov P., Pakhlova G., Park C. W., Park H.

A distinct peak is observed in the π±ψ′ invariant mass distribution near 4.43 GeV in B→Kπ±ψ′ decays. A fit using a Breit-Wigner resonance shape yields a peak mass and width of M=4433±4(stat)±2(syst)MeV and Γ=45-13+18(stat)-13+30(syst) MeV. The product branching fraction is determined to be B(B0→K Z±(4430))×B(Z±(4430)→π±ψ′)=(4. 1±1.0(stat)±1.4(syst))×10-5, where Z±(4430) is used to denote the observed structure. The statistical significance of the observed peak is 6.5σ. These results are obtained from a 605fb-1 data sample that contains 657×106 BB̄ pairs collected near the Υ(4S) resonance with the Belle detector at the KEKB asymmetric energy e+e- collider. © 2008 The American Physical Society.