Correlated Λc+Λ̄c- production in e+e- annihilations at √s∼10.5 GeV

Journal article

Using 13.6 fb-1 of continuum two-jet e+e-→cc̄ events collected with the CLEO detector, we have searched for baryon number correlations at the primary quark level. We have measured the likelihood for a Λc+ charmed baryon to be produced in the hemisphere opposite a Λc-relative to the likelihood for a Λc+ charmed baryon to be produced opposite an anticharmed meson D̄ in all cases, the reconstructed hadrons must have momentum greater than 2.3 GeV/c. We find that, given a Λc- (reconstructed in five different decay modes), a Λc+ is observed in the opposite hemisphere (0.72±0.11)% of the time (not corrected for efficiency). By contrast, given a D̄ in one hemisphere, a Λc+ is observed in the opposite hemisphere only ±(0.21 0.02)% of the time. Normalized to the total number of either Λc- or D̄ "tags," it is therefore 3.52±0.45±0.42 times more likely to find a Λc+ opposite a Λc- than a D̄ meson. This enhancement is not observed in the JETSET 7.3 e+e-→cc̄Monte Carlo simulation.

Authors: Bornheim, A; Lipeles, E; Pappas, S; Schmidtler, M; Shapiro, A

• Journal: Physical Review D
• Volume: 63
• Issue: 11
• Pages: 1120031-11200311
• Publication date: 2001-01-01
• ISSN: 0556-2821
• Language: English