ΛProduction ine+e−Annihilation at 29 GeV

The inclusive production cross section of $\Lambda$, $\overline{\Lambda }$ in $e^{+}{e}^{-}$ annihilation at a c.m. energy of 29 GeV has been measured with the time-projection-chamber detector at PEP. The average $\Lambda$, $\overline{\Lambda }$ multiplicity has been measured to be 0.197 ± 0.012(stat.) ±0.017(syst.). $\Lambda -\overline{\Lambda }$ pairs have been observed in jets for the first time, and the average number of $\Lambda -\overline{\Lambda }$ pairs per event has been measured to be 0.042 ± 0.017 ± 0.014.