Study of decay mechanisms in B-→Λc p̄π- decays and observation of low-mass structure in the Λc p̄ system

N Gabyshev; K Abe; K Abe; I Adachi; H Aihara; Y Asano; V Aulchenko; T Aushev; AM Bakich; U Bitenc; I Bizjak; S Blyth; A Bondar; A Bozek; M Bračko; J Brodzicka; TE Browder; P Chang; Y Chao; A Chen; WT Chen; BG Cheon; R Chistov; SK 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 Gorišek; T Hara; H Hayashii; M Hazumi; T Hokuue; Y Hoshi; S Hou; WS Hou; YB Hsiung; T Iijima; A Imoto; K Inami; A Ishikawa; R Itoh; M Iwasaki; Y Iwasaki; JH Kang; JS Kang; SU Kataoka; N Katayama; H Kawai; T Kawasaki; HR Khan; H Kichimi; HJ Kim; HO Kim; SK Kim; SM Kim; K Kinoshita; S Korpar; P Krokovny; S Kumar; CC Kuo; A Kuzmin; YJ Kwon; JS Lange; G Leder; T Lesiak; SW 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; SL Olsen; Y Onuki; H Ozaki; H Palka; CW Park

Journal article

Study of decay mechanisms in B-→Λc p̄π- decays and observation of low-mass structure in the Λc p̄ system

N Gabyshev, K Abe, K Abe, I Adachi, H Aihara, Y Asano, V Aulchenko, T Aushev, AM Bakich, U Bitenc, I Bizjak, S Blyth, A Bondar, A Bozek, M Bračko, J Brodzicka, TE Browder, P Chang, Y Chao, A Chen Show all

Physical Review Letters | AMER PHYSICAL SOC | Published : 2006

DOI: 10.1103/PhysRevLett.97.242001

Abstract

Using a sample of 152×106 BB̄ pairs accumulated with the Belle detector at the KEKB e+e- collider, we study the decay mechanism of three-body charmed decay B-→Λc+p̄π-. The intermediate two-body decay B-→Σc(2455)0p̄ is observed for the first time with a branching fraction of (3.7±0.7±0.4±1.0)×10-5 and a statistical significance of 8.4σ. We also observe a low-mass enhancement in the (Λc+p̄) 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)×10-5 with a statistical significance of 6.2σ. The errors are statistical, systematic, and that of ..

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