Ammar, Raymond G.Baringer, Philip S.Bean, AliceBesson, David ZekeCoppage, DonCopty, N.Davis, Robin E. P.Hancock, N.Kotov, S.Kravchenko, I.Kwak, Nowhan2007-04-132007-04-131997-10Fu, X, Nemati, B, et al. Observation of exclusive B decays to final states containing a charmed baryon. PHYSICAL REVIEW LETTERS. October 1997. 79(17) : 3125-3129http://publish.aps.org/https://hdl.handle.net/1808/1387Using data collected in the region of the Upsilon(4S) resonance with the CLEO-II detector, we report on the first observation of exclusive decays of the B meson to final states with a charmed baryon. We have measured the branching fractions B(B- --> Lambda(c)(+)(p) over bar pi(-)) = (0.62(-0.20)(+0.23) +/- 0.11 +/- 0.10) X 10(-3) and B((B) over bar(0) --> Lambda(c)(+)(p) over bar pi(+)pi(-)) = (1.33(-0.42)(+0.46) +/- 0.31 +/- 0.21) X 10(-3), where the first error is statistical, the second is systematic, and the third is due to uncertainty in the Lambda(c)(+) branching fractions. In addition, we report upper limits for final states of the form (B) over bar --> Lambda(c)(+)(p) over bar(n pi) and Lambda(c)(+)(p) over bar(n pi)pi(0), where (n pi) denotes up to four charged pions. [S0031-9007(97)04176-8].en-USArticleopenAccess