Abstract
We report evidence for the Cabibbo-suppressed decay of the charm baryon Λ c + into the final state pK − K +. The analysis is performed on data collected by high energy photoproduction experiment E687 during the 1990–1991 Fermilab fixed target run. The branching ratio of the decay Λ c + → pK − K + relative to the non-suppressed Λ c + → pK − π + is measured to be BR( pK − K +/ pK − π +) = 0.096 ± 0.029 ± 0.010. The upper limit of the decay into pø relative to the inclusive pK − K + decay is measured to be BR( pø/ pK − K + < 58% at the 90% confidence level.
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