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; Belle Collaboration

doi:10.1103/PhysRevLett.97.242001

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

Phys Rev Lett. 2006 Dec 15;97(24):242001. doi: 10.1103/PhysRevLett.97.242001. Epub 2006 Dec 11.

Authors

N Gabyshev¹, 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; Belle Collaboration

Affiliation

¹ Budker Institute of Nuclear Physics, Novosibirsk.

PMID: 17280269
DOI: 10.1103/PhysRevLett.97.242001

Abstract

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.