Observation of the cabibbo-suppressed decay Ξ+c→pK- π+
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2000-01-01
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Jun, S. Y.
Akchurin, N.
Andreev, V. A.
Atamantchouk, A. G.
Aykac, M.
Balatz, M. Y.
Bondar, N. F.
Bravar, A.
Cooper, P. S.
Dauwe, L. J.
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We report the first observation of the Cabibbo-suppressed charm baryon decay Ξ+c→pK- π+. We observe 150±22±5 events for the signal. The data were accumulated using the SELEX spectrometer during the 1996-1997 fixed target run at Fermilab, chiefly from a 600GeV/c Σ- beam. The branching fractions of the decay relative to the Cabibbo-favored Ξ+c→Σ+K-π+ and Ξ+c→Ξ-π+π+ are measured to be B(Ξ+c→pK-π+)/B(Ξ+c→Σ+K-π+)=0.22±0.06±0.03 and B(Ξ+c→pK-π+)/B(Ξ+c→Ξ-π+π+)=0.20±0.04±0.02, respectively. © 2000 The American Physical Society.
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Physical Review Letters, v. 84, n. 9, p. 1857-1861, 2000.