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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2009, vol. 80, p. -

Dalitz analysis of B→Kπ+ψ′ decays and the Z(4430)

Mizuk R., Adachi I., Aihara H., Arinstein K., Aushev T., Bakich A. M., Balagura V., Barberio E., Bay A., Belous K., Bhardwaj V., Bozek A., Bračko M., Browder T. E., Chang M. C., Chen A., Cheon B. G., Chiang C. C., Chistov R., Cho I. S., Choi S. K., Choi Y., Dalseno J., Danilov M., Eidelman S., Gabyshev N., Goldenzweig P., Golob B., Ha H., Haba J., Han B. Y., Hara T., Hasegawa Y., Hayasaka K., Hoshi Y., Hou W. S., Hyun H. J., Iijima T., Inami K., Ishikawa A., Ishino H., Itoh R., Iwasaki M., Iwasaki Y., Joshi N. J., Kah D. H., Kang J. H., Kapusta P., Kawai H., Kawasaki T., Kim H. J., Kim H. O., Kim J. H., Kim Y. I., Kim Y. J., Kinoshita K., Ko B. R., Korpar S., Križan P., Krokovny P., Kuzmin A., Kwon Y. J., Kyeong S. H., Lange J. S., Lee M. J., Lee S. E., Lesiak T., Liu C., Liu Y., Liventsev D., Louvot R., Marlow D., Matyja A., McOnie S., Miyabayashi K., Miyata H., Miyazaki Y., Mori T., Nakano E., Nakao M., Nakazawa H., Natkaniec Z., Nishida S., Nitoh O., Ohshima T., Okuno S., Olsen S. L., Pakhlov P., Pakhlova G.

From a Dalitz plot analysis of B→Kπ+ψ′ decays, we find a signal for Z(4430)+→π+ψ′ with a mass M=(4443-12-13+15+19)MeV/ c2, width Γ=(107-43-56+86+74)MeV, product branching fraction B(B̄0→K-Z(4430)+)×B(Z(4430)+→π+ψ′)=(3.2-0.9-1. 6+1.8+5.3)×10-5, and significance of 6.4σ that agrees with previous Belle measurements based on the same data sample. In addition, we determine the branching fraction B(B0→K*(892)0ψ′)=(5.52-0.32-0.58+0.35+0. 53)×10-4 and the fraction of K*(892)0 mesons that are longitudinally polarized fL=(44.8-2.7-5.3+4.0+4.0)%. 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. © 2009 The American Physical Society.