Abstract
We present the first measurements of absolute branching fractions of Ξ_{c}^{0} decays into Ξ^{-}π^{+}, ΛK^{-}π^{+}, and pK^{-}K^{-}π^{+} final states. The measurements are made using a dataset comprising (772±11)×10^{6} BB[over ¯] pairs collected at the ϒ(4S) resonance with the Belle detector at the KEKB e^{+}e^{-} collider. We first measure the absolute branching fraction for B^{-}→Λ[over ¯]_{c}^{-}Ξ_{c}^{0} using a missing-mass technique; the result is B(B^{-}→Λ[over ¯]_{c}^{-}Ξ_{c}^{0})=(9.51±2.10±0.88)×10^{-4}. We subsequently measure the product branching fractions B(B^{-}→Λ[over ¯]_{c}^{-}Ξ_{c}^{0})B(Ξ_{c}^{0}→Ξ^{-}π^{+}), B(B^{-}→Λ[over ¯]_{c}^{-}Ξ_{c}^{0})B(Ξ_{c}^{0}→ΛK^{-}π^{+}), and B(B^{-}→Λ[over ¯]_{c}^{-}Ξ_{c}^{0})B(Ξ_{c}^{0}→pK^{-}K^{-}π^{+}) with improved precision. Dividing these product branching fractions by the result for B^{-}→Λ[over ¯]_{c}^{-}Ξ_{c}^{0} yields the following branching fractions: B(Ξ_{c}^{0}→Ξ^{-}π^{+})=(1.80±0.50±0.14)%, B(Ξ_{c}^{0}→ΛK^{-}π^{+})=(1.17±0.37±0.09)%, and B(Ξ_{c}^{0}→pK^{-}K^{-}π^{+})=(0.58±0.23±0.05)%. For the above branching fractions, the first uncertainties are statistical and the second are systematic. Our result for B(Ξ_{c}^{0}→Ξ^{-}π^{+}) can be combined with Ξ_{c}^{0} branching fractions measured relative to Ξ_{c}^{0}→Ξ^{-}π^{+} to yield other absolute Ξ_{c}^{0} branching fractions.
Highlights
We present the first measurements of absolute branching fractions of Ξ0c decays into Ξ−πþ, ΛK−πþ, and pK−K−πþ final states
Weak decays of charmed hadrons play a unique role in the study of strong interactions, as the charm mass scale is near the boundary between perturbative and nonperturbative quantum chromodynamics (QCD)
The charmed-baryon sector offers an excellent laboratory for testing heavy-quark symmetry and light-quark chiral symmetry, both of which have important implications for the low-energy dynamics of heavy baryons interacting with Goldstone bosons [1]
Summary
We present first a measurement of the absolute branching fraction for B− → Λ −c Ξ0c using a missing-mass technique For this analysis we fully reconstruct the tag-side Bþ decay. We subsequently measure the product branching fractions BðB− → Λ −c Ξ0cÞBðΞ0c → Ξ−πþÞ, BðB− → Λ −c Ξ0cÞBðΞ0c → ΛK−πþÞ, and BðB− → Λ −c Ξ0cÞBðΞ0c → pK−K−πþÞ For these measurements we do not reconstruct the recoiling Bþ decay, as the signal decays are fully reconstructed. Dividing these product branching fractions by BðB− → Λ −c Ξ0cÞ yields the branching fractions BðΞ0c → Ξ−πþÞ, BðΞ0c → ΛK−πþÞ, and BðΞ0c → pK−K−πþÞ. Pc:m:s, PBþtag , and PΛ −c are the four-momenta of the initial eþe− system, the tagged Bþ meson, and the reconstructed
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