Evidence for the Baryonic Decay [bar over B][superscript 0] → D[superscript 0]Λ[bar over Λ]

Abstract

Evidence is presented for the baryonic B meson decay [bar over B][superscript 0] → D[superscript 0]Λ[bar over Λ] based on a data sample of 471 × 10[superscript 6] B[bar over B] pairs collected with the BABAR detector at the PEP-II asymmetric e[superscript +]e[superscript −] collider located at the SLAC National Accelerator Laboratory. The branching fraction is determined to be B([bar over B][superscript 0] → D[superscript 0]Λ[bar over Λ]) = (9.8[+2.9 over −2.6] ± 1.9) × 10[superscript −6], corresponding to a significance of 3.4 standard deviations including additive systematic uncertainties. A search for the related baryonic B meson decay [bar over B][superscript 0] → D[superscript 0]Σ[superscript 0][bar over Λ] with Σ[superscript 0] → Λγ is performed and an upper limit B([bar over B][superscript 0] → D[superscript 0]Σ[superscript 0][bar over Λ] + [bar over B][superscript 0] → D[superscript 0]Λ[bar over Σ][superscript 0]) < 3.1 × 10[superscript −5] is determined at 90% confidence level.