First Observation of the Doubly Cabibbo-Suppressed Decay of a Charmed Baryon: ?c+ ?pK+?-

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2016

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We report the first observation of the decay ?c+?pK+?- using a 980 fb-1 data sample collected by the Belle detector at the KEKB asymmetric-energy e+e- collider. This is the first observation of a doubly Cabibbo-suppressed decay of a charmed baryon. We measure the branching ratio of this decay with respect to its Cabibbo-favored counterpart to be B(?c+?pK+?-)/B(?c+?pK-?+)=(2.35�0.27�0.21)�10-3, where the uncertainties are statistical and systematic, respectively. � 2016 American Physical Society.

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24

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