Measurement of the absolute branching fraction of the inclusive decay Λ ¯ c − → n ¯ + X
Physical review(2023)
摘要
Based on ${e}^{+}{e}^{\ensuremath{-}}$ collision data corresponding to an integrated luminosity of $4.5\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ collected at the center-of-mass energies between 4.600 and 4.699 GeV with the BESIII detector at BEPCII, the absolute branching fraction of the inclusive decay ${\overline{\mathrm{\ensuremath{\Lambda}}}}_{c}^{\ensuremath{-}}\ensuremath{\rightarrow}\overline{n}+X$, where $X$ refers to any possible final state particles, is measured. The absolute branching fraction is determined to be $\mathcal{B}({\overline{\mathrm{\ensuremath{\Lambda}}}}_{c}^{\ensuremath{-}}\ensuremath{\rightarrow}\overline{n}+X)=(32.4\ifmmode\pm\else\textpm\fi{}0.7\ifmmode\pm\else\textpm\fi{}1.5)%$, where the first uncertainty is statistical and the second systematic. Assuming $CP$ symmetry, the measurement indicates that about one fourth of ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}$ (${\overline{\mathrm{\ensuremath{\Lambda}}}}_{c}^{\ensuremath{-}}$) decay modes with a neutron (an antineutron) in the final state have not been observed.
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关键词
inclusive decay,<mmlmath xmlnsmml=http//wwww3org/1998/math/mathml
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