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Observation of the Cabibbo-suppressed decay Xi_c+ -> p K- pi+

SELEX Collaboration·S. Y. Jun
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Abstract

We report the first observation of the Cabibbo-suppressed charm baryon decay Xi_c+ -> p K- pi+. We observe 150 +- 22 events for the signal. The data were accumulated using the SELEX spectrometer during the 1996-1997 fixed target run at Fermilab, chiefly from a 600 GeV/c Sigma- beam. The branching fractions of the decay relative to the Cabibbo-favored Xi_c+ -> Sigma+ K- pi+ and Xi_c+ -> X- pi+ pi+ are measured to be B(Xi_c+ -> p K- pi+)/B(Xi_c+ -> Sigma+ K- pi+) = 0.22 +- 0.06 +- 0.03 and B(Xi_c+ -> p K- pi+)/B(Xi_c+ -> X- pi+ pi+) = 0.20 +- 0.04 +- 0.02, respectively.

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SELEX Collaboration, S. Y. Jun. 1999-07-29. Observation of the Cabibbo-suppressed decay Xi_c+ -> p K- pi+. https://doi.org/10.1103/physrevlett.84.1857

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