Study of decay mechanisms in B--->Lambdac+ppi- decays and observation of low-mass structure in the Lambdac+p system期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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

Authors:	Gabyshev N Abe K 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

Institution:	Budker Institute of Nuclear Physics, Novosibirsk.

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.

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