Phys. Rev. D 63, 112003 (2001) [11 pages]Correlated Λc+Λ̅ c- production in e+e- annihilations at √s∼10.5 GeVReceived 29 January 2001; published 4 May 2001 Using 13.6 fb-1 of continuum two-jet e+e-→cc̅ 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 Λ̅ c- relative to the likelihood for a Λc+ charmed baryon to be produced opposite an anticharmed meson D̅ ; in all cases, the reconstructed hadrons must have momentum greater than 2.3 GeV/c. We find that, given a Λ̅ c- (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 D̅ 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 Λ̅ c- or D̅ “tags,” it is therefore 3.52±0.45±0.42 times more likely to find a Λc+ opposite a Λ̅ c- than a D̅ meson. This enhancement is not observed in the JETSET 7.3 e+e-→cc̅ Monte Carlo simulation. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.63.112003
DOI:
10.1103/PhysRevD.63.112003
PACS:
13.30.-a, 13.60.Rj, 13.65.+i, 14.20.Lq
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