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First Observation of theP-Wave Spin-Singlet Bottomonium Statesh b( 1 P )andh b( 2 P )

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posted on 2024-08-06, 09:42 authored by I. Adachi, H. Aihara, K. Arinstein, D. M. Asner, T. Aushev, T. Aziz, A. M. Bakich, E. Barberio, K. Belous, V. Bhardwaj, B. Bhuyan, A. Bondar, M. Bračko, J. Brodzicka, T. E. Browder, P. Chang, A. Chen, P. Chen, B. G. Cheon, K. Chilikin, R. Chistov, I.-S. Cho, K. Cho, Y. Choi, J. Dalseno, M. Danilov, Z. Drásal, A. Drutskoy, S. Eidelman, D. Epifanov, S. Esen, J. E. Fast, M. Feindt, V. Gaur, N. Gabyshev, A. Garmash, Y. M. Goh, B. Golob, T. Hara, K. Hayasaka, H. Hayashii, Y. Hoshi, W.-S. Hou, Y. B. Hsiung, H. J. Hyun, T. Iijima, A. Ishikawa, M. Iwabuchi, Y. Iwasaki, I. Jaegle, T'Mir Julius, J. H. Kang, N. Katayama, T. Kawasaki, H. Kichimi, H. O. Kim, J. B. Kim, K. T. Kim, M. J. Kim, Y. J. Kim, K. Kinoshita, B. R. Ko, N. Kobayashi, S. Koblitz, S. Korpar, P. Križan, T. Kuhr, T. Kumita, A. Kuzmin, Y.-J. Kwon, J. S. Lange, S.-H. Lee, J. Li, J. Libby, C. Liu, D. Liventsev, R. Louvot, J. MacNaughton, D. Matvienko, S. McOnie, K. Miyabayashi, H. Miyata, Y. Miyazaki, R. Mizuk, G. B. Mohanty, R. Mussa, Y. Nagasaka, E. Nakano, M. Nakao, H. Nakazawa, Z. Natkaniec, S. Neubauer, S. Nishida, K. Nishimura, O. Nitoh, T. Nozaki, T. Ohshima, S. Okuno, S. L. Olsen, Y. Onuki, P. Pakhlov, G. Pakhlova, H. Park, T. K. Pedlar, R. Pestotnik, M. Petrič, L. E. Piilonen, A. Poluektov, M. Ritter, M. Röhrken, S. Ryu, H. Sahoo, Y. Sakai, T. Sanuki, O. Schneider, C. Schwanda, A. J. Schwartz, K. Senyo, O. Seon, M. E. Sevior, M. Shapkin, V. Shebalin, T.-A. Shibata, J.-G. Shiu, B. Shwartz, F. Simon, P. Smerkol, Y.-S. Sohn, A. Sokolov, E. Solovieva, S. Stanič, M. Starič, M. Sumihama, G. Tatishvili, Y. Teramoto, I. Tikhomirov, K. Trabelsi, M. Uchida, S. Uehara, T. Uglov, Y. Unno, S. Uno, S. E. Vahsen, G. Varner, K. E. Varvell, A. Vinokurova, C. H. Wang, X. L. Wang, Y. Watanabe, J. Wicht, E. Won, B. D. Yabsley, Y. Yamashita, C. Z. Yuan, V. Zhilich, A. Zupanc
We report the first observations of the spin-singlet bottomonium states hb(1P) and hb(2P). The states are produced in the reaction e+e−→hb(nP)π+π− using a 121.4  fb−1 data sample collected at energies near the Υ(5S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. We determine M[hb(1P)]=(9898.2+1.1+1.0−1.0−1.1)  MeV/c2 and M[hb(2P)]=(10 259.8±0.6+1.4−1.0)  MeV/c2, which correspond to P-wave hyperfine splittings ΔMHF=(+1.7±1.5) and (+0.5+1.6−1.2)  MeV/c2, respectively. The significances of the hb(1P) and hb(2P) are 5.5σ and 11.2σ, respectively. We find that the production of the hb(1P) and hb(2P) is not suppressed relative to the production of the Υ(1S), Υ(2S), and Υ(3S).

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ISSN

0031-9007

Journal title

Physical Review Letters

Volume

108

Issue

3

Article number

article no. 032001

Publisher

American Physical Society

Copyright statement

Copyright © 2012 American Physical Society. The published version is reproduced in accordance with the copyright policy of the publisher.

Language

eng

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