Вы находитесь на старом сайте НГУ. Перейти на новый сайт

ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2012, vol. 108, p. -

Observation of two charged bottomoniumlike resonances in Y(5S) decays

Bondar A., Garmash A., Mizuk R., Santel D., Kinoshita K., Adachi I., Aihara H., Arinstein K., Asner D. M., Aushev T., Aziz T., Bakich A. M., Barberio E., Belous K., Bhardwaj V., Bischofberger M., Bozek A., Bračko M., Browder T. E., Chang M. C., Chang P., Chen A., Cheon B. G., Chilikin K., Chistov R., Cho I. S., Cho K., Choi S. K., Choi Y., Dalseno J., Danilov M., Doleal Z., Drutskoy A., Eidelman S., Epifanov D., Fast J. E., Gaur V., Gabyshev N., Goh Y. M., Golob B., Haba J., Hara T., Hayasaka K., Hoshi Y., Hyun H. J., Iijima T., Inami K., Ishikawa A., Iwabuchi M., Iwasaki Y., Iwashita T., Julius T., Kang J. H., Kawasaki T., Kichimi H., Kiesling C., Kim J. B., Kim J. H., Kim K. T., Kim M. J., Kim Y. J., Ko B. R., Kobayashi N., Koblitz S., Kody P., Korpar S., Krian P., Kuhr T., Kumar R., Kumita T., Kuzmin A., Lange J. S., Lee S. H., Li J., Li Y., Libby J., Liu C., Liu Z. Q., Liventsev D., Louvot R., Matvienko D., McOnie S., Miyata H., Miyazaki Y., Mohanty G. B., Moll A., Muramatsu N., Mussa R., Nakao M., Natkaniec Z., Neubauer S., Niiyama M.

We report the observation of two narrow structures in the mass spectra of the π ±Υ(nS) (n=1, 2, 3) and π ±h b(mP) (m=1, 2) pairs that are produced in association with a single charged pion in Υ(5S) decays. The measured masses and widths of the two structures averaged over the five final states are M 1=(10607.2±2.0)MeV/c2, Γ 1=(18.4±2.4) MeV, and M 2=(10652.2±1.5)MeV/c2, Γ 2=(11. 5±2.2)MeV. The results are obtained with a 121.4fb -1 data sample collected with the Belle detector in the vicinity of the Υ(5S) resonance at the KEKB asymmetric-energy e +e - collider. © 2012 American Physical Society.