| Literature DB >> 22400728 |
I Adachi1, 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 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.
Abstract
We report the first observations of the spin-singlet bottomonium states h(b)(1P) and h(b)(2P). The states are produced in the reaction e(+)e(-)→h(b)(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[h(b)(1P)]=(9898.2(-1.0-1.1)(+1.1+1.0)) MeV/c(2) and M[h(b)(2P)]=(10,259.8±0.6(-1.0)(+1.4)) MeV/c(2), which correspond to P-wave hyperfine splittings ΔM(HF)=(+1.7±1.5) and (+0.5(-1.2)(+1.6)) MeV/c(2), respectively. The significances of the h(b)(1P) and h(b)(2P) are 5.5σ and 11.2σ, respectively. We find that the production of the h(b)(1P) and h(b)(2P) is not suppressed relative to the production of the Υ(1S), Υ(2S), and Υ(3S).Entities:
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Year: 2012 PMID： 22400728 DOI： 10.1103/PhysRevLett.108.032001
Source DB: PubMed Journal: Phys Rev Lett ISSN： 0031-9007 Impact factor: 9.161