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

• Published in: Physical review letters Vol. 97; no. 24; p. 242001
• Main Authors: Gabyshev, N, Abe, K, Adachi, I, Aihara, H, Asano, Y, Aulchenko, V, Aushev, T, Bakich, A M, Bitenc, U, Bizjak, I, Blyth, S, Bondar, A, Bozek, A, Bracko, M, Brodzicka, J, Browder, T E, Chang, P, Chao, Y, Chen, A, Chen, W T, Cheon, B G, Chistov, R, Choi, S-K, Choi, Y, Chuvikov, A, Cole, S, Dalseno, J, Danilov, M, Dash, M, Drutskoy, A, Eidelman, S, Enari, Y, Fratina, S, Gershon, T, Gokhroo, G, Golob, B, Gorisek, A, Hara, T, Hayashii, H, Hazumi, M, Hokuue, T, Hoshi, Y, Hou, S, Hou, W-S, Hsiung, Y B, Iijima, T, Imoto, A, Inami, K, Ishikawa, A, Itoh, R, Iwasaki, M, Iwasaki, Y, Kang, J H, Kang, J S, Kataoka, S U, Katayama, N, Kawai, H, Kawasaki, T, Khan, H R, Kichimi, H, Kim, H J, Kim, H O, Kim, S K, Kim, S M, Kinoshita, K, Korpar, S, Krokovny, P, Kumar, S, Kuo, C C, Kuzmin, A, Kwon, Y-J, Lange, J S, Leder, G, Lesiak, T, Lin, S-W, Mandl, F, Matsumoto, T, Mikami, Y, Mitaroff, W, Miyake, H, Miyata, H, Mizuk, R, Nagamine, T, Nagasaka, Y, Nakano, E, Nakao, M, Nakazawa, H, Natkaniec, Z, Nishida, S, Nitoh, O, Ogawa, S, Ohshima, T, Okabe, T, Okuno, S, Olsen, S L, Onuki, Y, Ozaki, H, Palka, H, Park, C W
• Format: Journal Article
• Language: English
• Published: United States 15.12.2006
• ISSN: 0031-9007

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.