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Observation of two charged bottomonium-like resonances

Adachi I., Adamczyk K., Aihara H., Arinstein K., Arita Y., Asner D. M., Aso T., Aulchenko V., Aushev T., Aziz T., Bakich A. M., Balagura V., Ban Y., Barberio E., Bay A., Bedny I., Belhorn M., Belous K., Bhardwaj V., Bhuyan B., Bischofberger M., Blyth S., Bondar A., Bonvicini G., Bozek A., Bračko M., Brodzicka J., Brovchenko O., Browder T. E., Chang M. C., Chang P., Chao Y., Chen A., Chen K. F., Chen P., Cheon B. G., Chistov R., Cho I. S., Cho K., Choi K. S., Choi S. K., Choi Y., Crnkovic J., Dalseno J., Danilov M., Das A., Doležal Z., Drásal Z., Drutskoy A., Duh Y. T., Dungel W., Dutta D., Eidelman S., Epifanov D., Esen S., Fast J. E., Feindt M., Fujikawa M., Gaur V., Gabyshev N., Garmash A., Goh Y. M., Golob B., Grosse Perdekamp M., Guo H., Ha H., Haba J., Han Y. L., Hara K., Hara T., Hasegawa Y., Hayasaka K., Hayashii H., Heffernan D., Higuchi T., Hoi C. T., Horii Y., Hoshi Y., Hoshina K., Hou W. S., Hsiung Y. B., Hsu C. L., Hyun H. J., Igarashi Y., Iijima T., Imamura M., Inami K.

We report the observation of two narrow structures at 10610 MeV/c 2 and 10650 MeV/c2 in the π ±γ(nS) (n = 1,2,3) and π±hb(mP) (m = 1,2) mass spectra that are produced in association with a single charged pion in γ(5S) decays. The measured masses and widths of the two structures averaged over the five final states are M1 = 10608.4 ± 2.0MeV/c2, γ1 = 15.6 ± 2.5 MeV and M 2 = 10653.2 ± 1.5 MeV/c2, γ2 = 14.4 ±3.2 MeV. Analysis favors quantum numbers of IG(J P)=1+(1+) for both states. The results are obtained with a 121.4 fb-1 data sample collected with the Belle detector near the γ(5S) resonance at the KEKB asymmetric-energy e+e- collider.