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Study of decay mechanisms in B--->Lambdac+ppi- decays and observation of low-mass structure in the Lambdac+p system.

N Gabyshev, K Abe, K Abe, I Adachi, H Aihara, Y Asano, V Aulchenko, T Aushev, A M Bakich, U Bitenc, I Bizjak, S Blyth, A Bondar, A Bozek, M Bracko, J Brodzicka, T E Browder, P Chang, Y Chao, A Chen, W T Chen, B G Cheon, R Chistov, S-K Choi, Y Choi, A Chuvikov, S Cole, J Dalseno, M Danilov, M Dash, A Drutskoy, S Eidelman, Y Enari, S Fratina, T Gershon, G Gokhroo, B Golob, A Gorisek, T Hara, H Hayashii, M Hazumi, T Hokuue, Y Hoshi, S Hou, W-S Hou, Y B Hsiung, T Iijima, A Imoto, K Inami, A Ishikawa, R Itoh, M Iwasaki, Y Iwasaki, J H Kang, J S Kang, S U Kataoka, N Katayama, H Kawai, T Kawasaki, H R Khan, H Kichimi, H J Kim, H O Kim, S K Kim, S M Kim, K Kinoshita, S Korpar, P Krokovny, S Kumar, C C Kuo, A Kuzmin, Y-J Kwon, J S Lange, G Leder, T Lesiak, S-W Lin, F Mandl, T Matsumoto, Y Mikami, W Mitaroff, H Miyake, H Miyata, R Mizuk, T Nagamine, Y Nagasaka, E Nakano, M Nakao, H Nakazawa, Z Natkaniec, S Nishida, O Nitoh, S Ogawa, T Ohshima, T Okabe, S Okuno, S L Olsen, Y Onuki, H Ozaki, H Palka, C W Park, H Park, N Parslow, L S Peak, R Pestotnik, L E Piilonen, M Rozanska, H Sagawa, Y Sakai, N Sato, T Schietinger, O Schneider, A J Schwartz, K Senyo, R Seuster, M E Sevior, H Shibuya, V Sidorov, J B Singh, A Somov, R Stamen, S Stanic, M Staric, T Sumiyoshi, S Y Suzuki, O Tajima, F Takasaki, K Tamai, N Tamura, M Tanaka, Y Teramoto, X C Tian, T Tsuboyama, T Tsukamoto, S Uehara, T Uglov, K Ueno, S Uno, P Urquijo, G Varner, K E Varvell, S Villa, C H Wang, M-Z Wang, Q L Xie, B D Yabsley, A Yamaguchi, H Yamamoto, Y Yamashita, M Yamauchi, Heyoung Yang, C C Zhang, J Zhang, L M Zhang, Z P Zhang, V Zhilich, D Zontar, and Belle Collaboration

Phys Rev Lett 97(24):242001 (2006) PMID 17280269

Using a sample of 152 x 10(6) BB pairs accumulated with the Belle detector at the KEKB e+e- collider, we study the decay mechanism of three-body charmed decay B- --> Lambdac+ ppi-. The intermediate two-body decay B--->Sigmac (2455)0 p is observed for the first time with a branching fraction of (3.7 +/- 0.7 +/- 0.4 +/- 1.0) x 10(-5) and a statistical significance of 8.4sigma. We also observe a low-mass enhancement in the (Lambdac+p) system, which can be parametrized as a Breit-Wigner function with a mass of (3.35(-0.02)(+0.01) +/-0.02) GeV/c2 and a width of (0.07(-0.03)(+0.04) +/-0.04) GeV/c2. We measure its branching fraction to be (3.9(-0.7)(+0.8) +/- 0.4 +/- 1.0) x 10(-5) with a statistical significance of 6.2sigma. The errors are statistical, systematic, and that of the Lambdac+-->pK- pi+ decay branching fraction.

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