First measurements of absolute branching fractions of the Ξc 0 Baryon at Belle
Journal
Physical Review Letters
Journal Volume
122
Journal Issue
8
Date Issued
2019
Author(s)
Y. B. Li et al. (Belle Collaboration)
Abstract
We present the first measurements of absolute branching fractions of �Q_{c}^{0} decays into �Q^{-}�k^{+}, �NK^{-}�k^{+}, and pK^{-}K^{-}�k^{+} final states. The measurements are made using a dataset comprising (772��11)��10^{6} BB[over ?] pairs collected at the ?(4S) resonance with the Belle detector at the KEKB e^{+}e^{-} collider. We first measure the absolute branching fraction for B^{-}���N[over ?]_{c}^{-}�Q_{c}^{0} using a missing-mass technique; the result is B(B^{-}���N[over ?]_{c}^{-}�Q_{c}^{0})=(9.51��2.10��0.88)��10^{-4}. We subsequently measure the product branching fractions B(B^{-}���N[over ?]_{c}^{-}�Q_{c}^{0})B(�Q_{c}^{0}���Q^{-}�k^{+}), B(B^{-}���N[over ?]_{c}^{-}�Q_{c}^{0})B(�Q_{c}^{0}���NK^{-}�k^{+}), and B(B^{-}���N[over ?]_{c}^{-}�Q_{c}^{0})B(�Q_{c}^{0}��pK^{-}K^{-}�k^{+}) with improved precision. Dividing these product branching fractions by the result for B^{-}���N[over ?]_{c}^{-}�Q_{c}^{0} yields the following branching fractions: B(�Q_{c}^{0}���Q^{-}�k^{+})=(1.80��0.50��0.14)%, B(�Q_{c}^{0}���NK^{-}�k^{+})=(1.17��0.37��0.09)%, and B(�Q_{c}^{0}��pK^{-}K^{-}�k^{+})=(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(�Q_{c}^{0}���Q^{-}�k^{+}) can be combined with �Q_{c}^{0} branching fractions measured relative to �Q_{c}^{0}���Q^{-}�k^{+} to yield other absolute �Q_{c}^{0} branching fractions.
Type
journal article