Observation of Charmed-Baryon Production ine+e−Annihilation
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Abstract
A peak in the $p{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$ and $\overline{p}{K}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ invariant-mass spectra at 2.285\ifmmode\pm\else\textpm\fi{}0.006 GeV/${\mathit{c}}^{2}$ is observed, which is associated with the lowest-lying charmed baryon (${\ensuremath{\Lambda}}_{c}$). A cross section times branching ratio of 0.037\ifmmode\pm\else\textpm\fi{}0.012 nb at ${E}_{\mathrm{c}.\mathrm{m}.}=5.2$ GeV is measured with a substantial fraction of the events produced with an equal recoiling mass. New measurements of inclusive $p$ and $\ensuremath{\Lambda}$ cross sections are also presented, allowing an estimate of the branching ratio $B({\ensuremath{\Lambda}}_{c}\ensuremath{\rightarrow}p{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+})=0.022\ifmmode\pm\else\textpm\fi{}0.010$.
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