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. 2003 Dec 31;91(26 Pt 1):262001.
doi: 10.1103/PhysRevLett.91.262001. Epub 2003 Dec 23.

Observation of a narrow charmoniumlike state in exclusive B+/--->K+/-pi+pi-J/psi decays

S-K Choi  1 , S L Olsen, K Abe, T Abe, I Adachi, Byoung Sup Ahn, H Aihara, K Akai, M Akatsu, M Akemoto, Y Asano, T Aso, V Aulchenko, T Aushev, A M Bakich, Y Ban, S Banerjee, A Bondar, A Bozek, M Bracko, J Brodzicka, T E Browder, P Chang, Y Chao, K-F Chen, B G Cheon, R Chistov, Y Choi, Y K Choi, M Danilov, L Y Dong, A Drutskoy, S Eidelman, V Eiges, J Flanagan, C Fukunaga, K Furukawa, N Gabyshev, T Gershon, B Golob, H Guler, R Guo, C Hagner, F Handa, T Hara, N C Hastings, H Hayashii, M Hazumi, L Hinz, Y Hoshi, W-S Hou, Y B Hsiung, H-C Huang, T Iijima, K Inami, A Ishikawa, R Itoh, M Iwasaki, Y Iwasaki, J H Kang, S U Kataoka, N Katayama, H Kawai, T Kawasaki, H Kichimi, E Kikutani, H J Kim, Hyunwoo Kim, J H Kim, S K Kim, K Kinoshita, H Koiso, P Koppenburg, S Korpar, P Krizan, P Krokovny, S Kumar, A Kuzmin, J S Lange, G Leder, S H Lee, T Lesiak, S-W Lin, D Liventsev, J MacNaughton, G Majumder, F Mandl, D Marlow, T Matsumoto, S Michizono, T Mimashi, W Mitaroff, K Miyabayashi, H Miyake, D Mohapatra, G R Moloney, T Nagamine, Y Nagasaka, T Nakadaira, T T Nakamura, M Nakao, Z Natkaniec, S Nishida, O Nitoh, T Nozaki, S Ogawa, Y Ogawa, K Ohmi, Y Ohnishi, T Ohshima, N Ohuchi, K Oide, T Okabe, S Okuno, W Ostrowicz, H Ozaki, H Palka, H Park, N Parslow, L E Piilonen, H Sagawa, S Saitoh, Y Sakai, T R Sarangi, M Satapathy, A Satpathy, O Schneider, A J Schwartz, S Semenov, K Senyo, R Seuster, M E Sevior, H Shibuya, T Shidara, B Shwartz, V Sidorov, N Soni, S Stanic, M Staric, A Sugiyama, T Sumiyoshi, S Suzuki, F Takasaki, K Tamai, N Tamura, M Tanaka, M Tawada, G N Taylor, Y Teramoto, T Tomura, K Trabelsi, T Tsukamoto, S Uehara, K Ueno, Y Unno, S Uno, G Varner, K E Varvell, C C Wang, C H Wang, J G Wang, Y Watanabe, E Won, B D Yabsley, Y Yamada, A Yamaguchi, Y Yamashita, H Yanai, Heyoung Yang, J Ying, M Yoshida, C C Zhang, Z P Zhang, D Zontar; Belle Collaboration
Affiliations

Observation of a narrow charmoniumlike state in exclusive B+/--->K+/-pi+pi-J/psi decays

S-K Choi et al. Phys Rev Lett. .

Abstract

We report the observation of a narrow charmoniumlike state produced in the exclusive decay process B+/--->K+/-pi(+)pi(-)J/psi. This state, which decays into pi(+)pi(-)J/psi, has a mass of 3872.0+/-0.6(stat)+/-0.5(syst) MeV, a value that is very near the M(D0)+M(D(*0)) mass threshold. The results are based on an analysis of 152M B-Bmacr; events collected at the Upsilon(4S) resonance in the Belle detector at the KEKB collider. The signal has a statistical significance that is in excess of 10sigma.

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