Inclusive Lambda_c Production in e^+e^- Annihilations at sqrts=10.54 GeV and in Upsilon(4S) Decays release_6pktivschfegblvcn7wsbmty4q

by The BABAR Collaboration, B. Aubert, et al

Released as a report .

2006  

Abstract

We present measurements of the total production rates and momentum distributions of the charmed baryon Λ_c^+ in e^+e^- → hadrons at a center-of-mass energy of 10.54 GeV and in Υ(4S) decays. In hadronic events at 10.54 GeV, charmed hadrons are almost exclusively leading particles in e^+e^- → cc̅ events, allowing direct studies of c-quark fragmentation. We measure a momentum distribution for Λ_c^+ baryons that differs significantly from those measured previously for charmed mesons. Comparing with a number of models, we find none that can describe the distribution completely. We measure an average scaled momentum of < x_p > = 0.574±0.009 and a total rate of N_Λ c^qq̅ = 0.057±0.002(exp.)±0.015(BF) Λ_c^+ per hadronic event, where the experimental error is much smaller than that due to the branching fraction into the reconstructed decay mode, pK^-π^+. In Υ (4S) decays we measure a total rate of N_Λ c^Υ = 0.091±0.006(exp.)±0.024(BF) per Υ(4S) decay, and find a much softer momentum distribution than expected from B decays into a Λ_c^+ plus an antinucleon and one to three pions.
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Type  report
Stage   submitted
Date   2006-09-05
Version   v1
Language   en ?
Number  BABAR-PUB-06/054, SLAC-PUB-12074
arXiv  hep-ex/0609004v1
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