Energy Scan of the e+e- → hb ( nP ) π+π- ( n=1 , 2) Cross Sections and Evidence for Υ ( 11020 ) Decays into Charged Bottomoniumlike States

• Published in: Physical review letters 2016-09, Vol.117 (14)
• Main Authors: Mizuk, R., Bondar, A., Adachi, I., Asner, D. M., Atmacan, H., Aulchenko, V., Aushev, T., Ayad, R., Barberio, E., Bhuyan, B., Bobrov, A., Bozek, A., Bračko, M., Červenkov, D., Chekelian, V., Chen, A., Cheon, B. G., Chilikin, K., Choi, S. -K., Choi, Y., Dash, N., Doležal, Z., Drutskoy, A., Eidelman, S., Fulsom, B. G., Gaur, V., Garmash, A., Goldenzweig, P., Golob, B., Hayasaka, K., Hayashii, H., Hsu, C. -L., Inguglia, G., Jaegle, I., Julius, T., Kang, K. H., Katrenko, P., Kim, D. Y., Kim, J. B., Kim, K. T., Kim, Y. J., Korpar, S., Kotchetkov, D., Krokovny, P., Kuzmin, A., Kwon, Y. -J., Li, C. H., Li, L., Libby, J., Liventsev, D., Lubej, M., Masuda, M., Matsuda, T., Matvienko, D., Miyabayashi, K., Moll, A., Nakano, E., Nanut, T., Negishi, K., Niiyama, M., Nisar, N. K., Olsen, S. L., Onuki, Y., Pakhlov, P., Pakhlova, G., Pal, B., Paul, S., Pestotnik, R., Petrič, M., Piilonen, L. E., Ritter, M., Savinov, V., Schlüter, T., Schnell, G., Schwanda, C., Seino, Y., Semmler, D., Sevior, M. E., Shebalin, V., Shibata, T. -A., Shwartz, B., Solovieva, E., Starič, M., Stypula, J., Takizawa, M., Tamponi, U., Tanida, K., Trabelsi, K., Uglov, T., Uno, S., Urquijo, P., Van Hulse, C., Varner, G., Williams, K. M., Won, E., Yamaoka, J., Yelton, J., Yuan, C. Z., Zhilich, V., Zupanc, A.
• Format: Article
• Language: English
• Subjects: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
• ISSN: 0031-9007; 1079-7114
• DOI: 10.1103/PhysRevLett.117.142001

With data collected with the Belle detector at the KEKB asymmetric-energy e+e- collider, we measure the energy dependence of the e+e- → hb ( nP ) π+π- ( n=1 , 2) cross sections from thresholds up to 11.02 GeV. We find clear Υ ( 10860 ) and Υ ( 11020 ) peaks with little or no continuum contribution. We study the resonant substructure of the Υ ( 11020 ) → hb ( nP ) π+π- transitions and find evidence that they proceed entirely via the intermediate isovector states Zb ( 10610 ) and Zb ( 10650 ) . The relative fraction of these states is loosely constrained by the current data: The hypothesis that only Zb ( 10610 ) is produced is excluded at the level of 3.3 standard deviations, while the hypothesis that only Zb ( 10650 ) is produced is not excluded at a significant state.