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. 2008 Apr 11;100(14):142001.
doi: 10.1103/PhysRevLett.100.142001. Epub 2008 Apr 8.

Observation of a resonancelike structure in the pi +- psi' mass distribution in exclusive B-->Kpi +- psi' decays

S-K Choi  1 , S L Olsen, I Adachi, H Aihara, V Aulchenko, T Aushev, T Aziz, A M Bakich, V Balagura, I Bedny, U Bitenc, A Bondar, A Bozek, M Bracko, J Brodzicka, T E Browder, P Chang, Y Chao, A Chen, K-F Chen, W T Chen, B G Cheon, R Chistov, Y Choi, J Dalseno, M Danilov, M Dash, S Eidelman, N Gabyshev, B Golob, J Haba, T Hara, K Hayasaka, H Hayashii, M Hazumi, D Heffernan, Y Hoshi, W-S Hou, H J Hyun, T Iijima, K Inami, A Ishikawa, H Ishino, R Itoh, M Iwasaki, Y Iwasaki, D H Kah, J H Kang, N Katayama, H Kawai, T Kawasaki, H Kichimi, H O Kim, S K Kim, Y J Kim, K Kinoshita, P Krizan, P Krokovny, R Kumar, C C Kuo, A Kuzmin, Y-J Kwon, J S Lange, J S Lee, M J Lee, S E Lee, T Lesiak, A Limosani, S-W Lin, Y Liu, D Liventsev, F Mandl, A Matyja, S McOnie, T Medvedeva, W Mitaroff, K Miyabayashi, H Miyake, H Miyata, Y Miyazaki, R Mizuk, G R Moloney, E Nakano, M Nakao, S Nishida, O Nitoh, T Nozaki, S Ogawa, T Ohshima, S Okuno, H Ozaki, P Pakhlov, G Pakhlova, C W Park, H Park, L S Peak, R Pestotnik, L E Piilonen, H Sahoo, Y Sakai, O Schneider, A J Schwartz, K Senyo, M Shapkin, C P Shen, H Shibuya, B Shwartz, J B Singh, A Somov, S Stanic, M Staric, T Sumiyoshi, S Y Suzuki, F Takasaki, K Tamai, M Tanaka, Y Teramoto, I Tikhomirov, S Uehara, T Uglov, Y Unno, S Uno, P Urquijo, G Varner, K Vervink, S Villa, C H Wang, M-Z Wang, P Wang, X L Wang, Y Watanabe, R Wedd, E Won, B D Yabsley, Y Yamashita, C Z Yuan, Z P Zhang, V Zhulanov, A Zupanc, O Zyukova; Belle Collaboration
Affiliations
Free article

Observation of a resonancelike structure in the pi +- psi' mass distribution in exclusive B-->Kpi +- psi' decays

S-K Choi et al. Phys Rev Lett. .
Free article

Abstract

A distinct peak is observed in the pi +/- psi' invariant mass distribution near 4.43 GeV in B-->K pi +/- psi' decays. A fit using a Breit-Wigner resonance shape yields a peak mass and width of M=4433+/-4(stat)+/-2(syst) MeV and Gamma=45-13+18(stat)-13+30(syst) MeV. The product branching fraction is determined to be B(B 0-->K -/+Z+/-(4430)) x B(Z+/-(4430)-->pi+/-psi')=(4.1+/-1.0(stat)+/-1.4(syst)) x 10(-5), where Z+/-(4430) is used to denote the observed structure. The statistical significance of the observed peak is 6.5 sigma. These results are obtained from a 605 fb(-1) data sample that contains 657 x 10(6) BB pairs collected near the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric energy e+ e- collider.

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