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Phys. Rev. D 62, 072005 (2000) [18 pages]

Measurement of B(Λc+→pK-π+)

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D. E. Jaffe et al. (CLEO Collaboration)
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Received 28 March 2000; published 12 September 2000

The Λc+→pK-π+ yield has been measured in a sample of two-jet continuum events containing both a charm tag (D̅ ) as well as an antiproton (e+e-D̅ p̅ X), with the antiproton in the hemisphere opposite the D̅ (measurement of charge conjugate modes is implicit throughout). Under the hypothesis that such selection criteria tag e+e-D̅ p̅ Λc+X events, the Λc+→pK-π+ branching fraction can be determined by measuring the pK-π+ yield in the same hemisphere as the antiprotons in our D̅ p̅ X sample. Three types of D̅ charm tags are used, πsoft- (from D*-D0πsoft-), electrons (from D̅ →Xe-ν), and fully reconstructed D0K+π- or D-K+π-π- or Ds-φπ-. Combining our results obtained from the three independent charm tags, we obtain B(Λc+→pK-π+)=(5.0±0.5±1.2)%.

© 2000 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevD.62.072005
DOI:
10.1103/PhysRevD.62.072005
PACS:
13.30.Eg, 14.20.Lq