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Inclusive Lambda(+)(c) production in e(+)e(-) annihilations at root s=10.54 GeV and in Y(4S) decays
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BaBar Collaboration (Including:
). (2007) Inclusive Lambda(+)(c) production in e(+)e(-) annihilations at root s=10.54 GeV and in Y(4S) decays. PHYSICAL REVIEW D, 75 (1). -. doi:10.1103/PhysRevD.75.012003 ISSN 1550-7998.Research output not available from this repository.
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Official URL: http://dx.doi.org/10.1103/PhysRevD.75.012003
Abstract
We present measurements of the total production rates and momentum distributions of the charmed baryon Lambda(+)(c) in e(+)e(-)-> hadrons at a center-of-mass energy of 10.54 GeV and in Upsilon(4S) decays. In hadronic events at 10.54 GeV, charmed hadrons are almost exclusively leading particles in e(+)e(-)-> cc events, allowing direct studies of c-quark fragmentation. We measure a momentum distribution for Lambda(+)(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-Lambda c(qq)=0.057 +/- 0.002(exp.)+/- 0.015(BF) Lambda(+)(c) per hadronic event, where the experimental error is much smaller than that due to the branching fraction into the reconstructed decay mode, pK(-)pi(+). In Upsilon(4S) decays we measure a total rate of N-Lambda c(Upsilon)=0.091 +/- 0.006(exp.)+/- 0.024(BF) per Upsilon(4S) decay, and find a much softer momentum distribution than expected from B decays into a Lambda(+)(c) plus an antinucleon and one to three pions.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
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Journal or Publication Title: | PHYSICAL REVIEW D | ||||
Publisher: | AMERICAN PHYSICAL SOC | ||||
ISSN: | 1550-7998 | ||||
Official Date: | January 2007 | ||||
Dates: |
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Volume: | 75 | ||||
Number: | 1 | ||||
Number of Pages: | 16 | ||||
Page Range: | - | ||||
DOI: | 10.1103/PhysRevD.75.012003 | ||||
Publication Status: | Published |
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