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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2013, vol. 88, p. -

First observation of the Zb0(10610) in a Dalitz analysis of Υ(10860)→Υ(nS)π0π0

Krokovny P., Bondar A., Adachi I., Aihara H., Arinstein K., Asner D. M., Aulchenko V., Aushev T., Aziz T., Bakich A. M., Bala A., Bay A., Bhardwaj V., Bhuyan B., Bonvicini G., Bookwalter C., Bozek A., Bračko M., Browder T. E., Chang P., Chen A., Chen P., Cheon B. G., Chilikin K., Chistov R., Cho I. S., Cho K., Chobanova V., Choi S. K., Choi Y., Cinabro D., Dalseno J., Danilov M., Dingfelder J., Doležal Z., Drásal Z., Drutskoy A., Dutta D., Eidelman S., Epifanov D., Farhat H., Fast J. E., Feindt M., Ferber T., Frey A., Gaur V., Gabyshev N., Ganguly S., Garmash A., Gillard R., Goh Y. M., Golob B., Haba J., Hara T., Hayasaka K., Hayashii H., Hoshi Y., Hou W. S., Hsiung Y. B., Hyun H. J., Iijima T., Ishikawa A., Itoh R., Iwasaki Y., Julius T., Kah D. H., Kang J. H., Kato E., Kawai H., Kawasaki T., Kiesling C., Kim D. Y., Kim H. O., Kim J. B., Kim J. H., Kim Y. J., Kinoshita K., Klucar J., Ko B. R., Kodyš P., Korpar S., Križan P., Kuhr T., Kumita T., Kuzmin A., Kwon Y. J., Lange J. S., Lee S. H., Li J., Li Y., Libby J., Liu Y.

We report the first observation of Υ(10860)→Υ(1,2,3S) π0π0 decays. The neutral partner of the Zb±(10610), the Zb0(10610) decaying to Υ(2,3S)π0, is observed for the first time with a 6.5σ significance using a Dalitz analysis of Υ(10860)→Υ(2,3S) π0π0 decays. The results are obtained with a 121.4 fb-1 data sample collected with the Belle detector at the Υ(10860) resonance at the KEKB asymmetric-energy e+e- collider. © 2013 American Physical Society.