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Published November 9, 2010 | Published
Journal Article Open

Correlated leading baryon-antibaryon production in e^+e^- → c^c̅ → Λ^+_c^ Λ̅ ^-_c X


We present a study of 649 ± 35 e^+e^- → cc̅ events produced at √s ≈ 10:6 GeV containing both a Λ^+_c baryon and a Λ̅ -_c 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 c̅ 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.

Additional Information

© 2010 The American Physical Society. Received 15 June 2010; published 9 November 2010. We are grateful for the excellent luminosity and machine conditions provided by our PEP-II colleagues, and for the substantial dedicated effort from the computing organizations that support BABAR. The collaborating institutions wish to thank SLAC for its support and kind hospitality. This work is supported by DOE and NSF (USA), NSERC (Canada), CEA and CNRS-IN2P3 (France), BMBF and DFG (Germany), INFN (Italy), FOM (The Netherlands), NFR (Norway), MES (Russia), MEC (Spain), and STFC (United Kingdom). Individuals have received support from the Marie Curie EIF (European Union) and the A. P. Sloan Foundation.

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Published - Aubert2010p11993Phys_Rev_D.pdf


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