Inclusive Λc+ production in e+e annihilations at s=10.54GeV and in Υ(4S) decays

B. Aubert et al. (BABAR Collaboration)
Phys. Rev. D 75, 012003 – Published 9 January 2007

Abstract

We present measurements of the total production rates and momentum distributions of the charmed baryon Λc+ in e+ehadrons 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+ecc¯ events, allowing direct studies of c-quark fragmentation. We measure a momentum distribution for Λc+ 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 xp=0.574±0.009 and a total rate of NΛcqq¯=0.057±0.002(exp.)±0.015(BF)Λc+ per hadronic event, where the experimental error is much smaller than that due to the branching fraction into the reconstructed decay mode, pKπ+. In Υ(4S) decays we measure a total rate of NΛcΥ=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 Λc+ plus an antinucleon and one to three pions.

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  • Received 5 September 2006

DOI:https://doi.org/10.1103/PhysRevD.75.012003

©2007 American Physical Society

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Vol. 75, Iss. 1 — 1 January 2007

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