Evidence of the Cabibbo-Suppressed decay
Lambda(c) --> pK-K+
by P.L. Frabetti et al.
We report evidence for the Cabibbo-suppressed decay of the charm baryon
Lambda(c) into the final state pKK. The analysis is performed on data collected
by high energy photoproduction experiment E687 during the 1990-91
Fermilab fixed target run. The branching ratio of the decay
Lambda(c) --> pKK
relative to the non-suppressed Lambda(c) --> pKpi
is measured to be
BR(Lambda(c) --> pKK/Lambda(c) --> pKK)= 0.096 +- 0.029 +- 0.010.
The upper limit of the decay into p phi relative
to the inclusive p KK decay is measured to be
BR(Lambda(c) --> p phi/ Lambda(c) --> p KK) < 58 % at
the 90% confidence level.