We present a study of 649±35 e⊃+e⊃-→cc̄ events produced at √s±10.6GeV containing both a Λc+ baryon and a Λ̄c- antibaryon. The number observed is roughly 4 times that expected if the leading charmed hadron types are uncorrelated, confirming an observation by the CLEO Collaboration. We find a 2-jet topology in these events but very few additional baryons, demonstrating that the primary c and c̄ are predominantly contained in a correlated baryon-antibaryon system. In addition to the charmed baryons we observe on average 2.6±0.2 charged intermediate mesons, predominantly pions, carrying 65% of the remaining energy.
Aubert, B., Karyotakis, Y., Lees, J., Poireau, V., Prencipe, E., Prudent, X., et al. (2010). Correlated leading baryon-antibaryon production in e⊃+e⊃- →cc̄→Λc+Λ̄c-X. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 82(9) [10.1103/PhysRevD.82.091102].
Correlated leading baryon-antibaryon production in e⊃+e⊃- →cc̄→Λc+Λ̄c-X
CARPINELLI, MassimoMembro del Collaboration Group
;
2010
Abstract
We present a study of 649±35 e⊃+e⊃-→cc̄ events produced at √s±10.6GeV containing both a Λc+ baryon and a Λ̄c- antibaryon. The number observed is roughly 4 times that expected if the leading charmed hadron types are uncorrelated, confirming an observation by the CLEO Collaboration. We find a 2-jet topology in these events but very few additional baryons, demonstrating that the primary c and c̄ are predominantly contained in a correlated baryon-antibaryon system. In addition to the charmed baryons we observe on average 2.6±0.2 charged intermediate mesons, predominantly pions, carrying 65% of the remaining energy.
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