A Study of Bbar to Xi_c Lambda_c^- and Bbar to Lambda_c^+ Lambda_c^- Kbar Decays at \babar
We report measurements of B-meson decays into two- and three-body final states containing two charmed baryons using a sample of 230 million {Upsilon}(4S) {yields} B{bar B} decays. We find significant signals in two modes, measuring branching fractions {beta}(B{sup -} {yields} {Lambda}{sub c}{sup +}{Lambda}{sub c}{sup -}K{sup -}) = (1.14 {+-} 0.15 {+-} 0.17 {+-} 0.60) x 10{sup -3} and {beta}(B{sup -}{yields} {Xi}{sup 0}{sub c}{bar {Lambda}}{sub c}{sup -}) x {beta}({Xi}{sup 0}{sub c} {yields} {Xi}{sup -}{pi}{sup +}) = (2.08 {+-} 0.65 {+-} 0.29 {+-} 0.54) x 10{sup -5}, where the uncertainties are statistical, systematic, and from the branching fraction {beta}({Lambda}{sup +}{sub c} {yields} pK{sup -}{pi}{sup +}), respectively. We also set upper limits at the 90% confidence level on two other modes: {beta}({bar {beta}}{sup 0} {yields} {Xi}{sup +}{sub c}{bar {Lambda}}{sup -}{sub c}) x {beta}({Xi}{sup +}{sub c} {yields} {Xi}{sup -}{pi}{sup +}{pi}{sup +}) < 5.6 x 10{sup -5} and {beta}({bar B}{sup 0} {yields} {Lambda}{sup +}{sub c}{bar {Lambda}}{sup -}{sub c}{bar K}{sup 0}) < 1.5 x 10{sup -3}. We observe structure centered at an invariant mass of 2.93 GeV/c{sup 2} in the {Lambda}{sup +}{sub c}K{sup -} mass distribution of the decay B{sup -} {yields} {Lambda}{sup +}{sub c}{bar {Lambda}}{sup -}{sub c}K{sup -}.
- Research Organization:
- Stanford Linear Accelerator Center (SLAC)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76SF00515
- OSTI ID:
- 919430
- Report Number(s):
- SLAC-PUB-12938; arXiv:0710.5775
- Journal Information:
- Physical Review D, Journal Name: Physical Review D
- Country of Publication:
- United States
- Language:
- English
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