Cross sections are presented for the inclusive production of $\Lambda$ hyperons in electron-positron annihilations at $\sqrt{s}=29\mathrm{}$ GeV based on the full 291-${\mathrm{pb}}^{-1\mathrm{}}$ sample of data taken in the High Resolution Spectrometer experiment at the SLAC $e^{+}{e}^{-}$ storage ring PEP. These results, and the associated correlation analyses, are consistent with the Lund model predictions with the strange diquark suppression ratio $\delta$ fixed at 0.59±0.10±0.18, as compared to the standard Lund value of 0.32. The $\Lambda$ multiplicity has been found to be 0.182±0.020 per event. The opposite-strangeness multiplicity $〈n_{\Lambda \overline{\Lambda }}〉$ has been measured to be 0.046±0.020, whereas the like-strangeness multiplicity $〈n_{\Lambda \Lambda +\overline{\Lambda }\overline{\Lambda }}〉$ is 0.009±0.028. A strong correlation is found between $\Lambda \text{'}\mathrm{s}$ and $\overline{\Lambda }\text{'}\mathrm{s}$; when one is found in an event, the other is found in the same event with a probability that exceeds 50%.

• Received 8 July 1991

DOI:https://doi.org/10.1103/PhysRevD.45.3949