| Abstract |
content_type = "text/plain"
user_agent = "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)"
moz = "Mozilla/5.0 "
moz_version = "5"
We report measurements of B-meson decays into two- and three-body final states
containing two charmed baryons using a sample of 230 million Y(4S) -> B Bbar decays.
We find significant signals in two modes, measuring branching fractions
BF(B^- -> \Lambda_c^+ \Lambda_c^- K^-) = (1.14 +- 0.15 +- 0.17 +- 0.60) x 10^{-3} and
BF(B^- -> \Xi_c^0 \Lambda_c^-) x BF(\Xi_c^0 -> \Xi^- \pi^+) = (2.08 +- 0.65 +- 0.29 +- 0.54) x 10^{-5},
where the uncertainties are statistical, systematic, and from the branching fraction
BF(\Lambda_c^+ -> p K^- \pi^+), respectively. We also set upper limits at the 90\% confidence level on two other modes:
BF(B0bar -> \Xi_c^+ \Lambda_c^-) x BF(\Xi_c^+ -> \Xi^- \pi^+ \pi^+) < 5.6 x 10^{-5} and
BF(B0bar -> \Lambda_c^+ \Lambda_c^- K0bar) < 1.5 x 10^{-3}.
We observe structure centered at an invariant mass of 2.93 GeV/c^2
in the \Lambda_c^+ K^- mass distribution of the decay
B^- -> \Lambda_c^+ \Lambda_c^- K^-.
|
