Measurement of the asymmetry parameter for the decayΛ¯→p¯π+

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Abstract

Based on a sample of $58\ifmmode\times\else\texttimes\fi{}{10}^{6}J/\ensuremath{\psi}$ decays collected with the BESII detector at the BEPC, the $\overline{\ensuremath{\Lambda}}$ decay parameter ${\ensuremath{\alpha}}_{\overline{\ensuremath{\Lambda}}}$ for $\overline{\ensuremath{\Lambda}}\ensuremath{\rightarrow}\overline{p}{\ensuremath{\pi}}^{+}$ is measured using about 9000 $J/\ensuremath{\psi}\ensuremath{\rightarrow}\ensuremath{\Lambda}\overline{\ensuremath{\Lambda}}\ensuremath{\rightarrow}p\overline{p}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ decays. A fit to the joint angular distributions yields ${\ensuremath{\alpha}}_{\overline{\ensuremath{\Lambda}}}(\overline{\ensuremath{\Lambda}}\ensuremath{\rightarrow}\overline{p}{\ensuremath{\pi}}^{+})=\ensuremath{-}0.755\ifmmode\pm\else\textpm\fi{}0.083\ifmmode\pm\else\textpm\fi{}0.063$, where the first error is statistical, and the second systematic.

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