Using a 13.7 fb-1 sample of continuum two-jet e +e- → qq̄ events collected with the CLEO detector, we have searched for correlations between Λ and Λ̄ particles, specifically in cases where the opening angle between the two particles is large and each has momentum > 1 GeV/c. Such correlations may indicate the presence of baryon number conservation at the primary quark level. A previous CLEO study of ΛcΛc correlations indicated direct, associated production of primary charmed baryons Λc: e+e- → cc̄ → ΛcΛ̄c. That effect was not observed in Monte Carlo simulations. Our current search for similar direct, associated production of Λ baryons at the primary quark level (e+e - → ss̄ → ΛΛ̄, e.g.) qualitatively indicates a similar effect, although it relies on a Monte Carlo dependent subtraction of background ΛΛ̄ production (based on the default JETSET 7.4 event generator).
ASJC Scopus subject areas
- Nuclear and High Energy Physics