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
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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