First Measurements of Absolute Branching Fractions of the Ξ_{c}
Phys Rev Lett
; 122(8): 082001, 2019 Mar 01.
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| ID: mdl-30932568
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 Ï(4S) resonance with the Belle detector at the KEKB e^{+}e^{-} collider. We first measure the absolute branching fraction for B^{-}âΛ[over ¯]_{c}^{-}Ξ_{c}^{0} using a missing-mass technique; the result is B(B^{-}âΛ[over ¯]_{c}^{-}Ξ_{c}^{0})=(9.51±2.10±0.88)×10^{-4}. We subsequently measure the product branching fractions B(B^{-}âΛ[over ¯]_{c}^{-}Ξ_{c}^{0})B(Ξ_{c}^{0}âΞ^{-}π^{+}), B(B^{-}âΛ[over ¯]_{c}^{-}Ξ_{c}^{0})B(Ξ_{c}^{0}âΛK^{-}π^{+}), and B(B^{-}âΛ[over ¯]_{c}^{-}Ξ_{c}^{0})B(Ξ_{c}^{0}âpK^{-}K^{-}π^{+}) with improved precision. Dividing these product branching fractions by the result for B^{-}âΛ[over ¯]_{c}^{-}Ξ_{c}^{0} yields the following branching fractions B(Ξ_{c}^{0}âΞ^{-}π^{+})=(1.80±0.50±0.14)%, B(Ξ_{c}^{0}âΛK^{-}π^{+})=(1.17±0.37±0.09)%, and B(Ξ_{c}^{0}âpK^{-}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}âΞ^{-}π^{+}) can be combined with Ξ_{c}^{0} branching fractions measured relative to Ξ_{c}^{0}âΞ^{-}π^{+} to yield other absolute Ξ_{c}^{0} branching fractions.
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Phys Rev Lett
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2019
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Article