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First observation of doubly Cabibbo-suppressed decay of a charmed baryon; $$Lambda_c^{+} rightarrow pK^+pi^-$$

チャームバリオンにおける二重キャビボー抑制崩壊の初観測; $$Lambda_c^{+} rightarrow pK^+pi^-$$

Yang, S. B.*; 谷田 聖; Belle Collaboration*; 他191名*

Yang, S. B.*; Tanida, Kiyoshi; Belle Collaboration*; 191 of others*

We report the first observation of the decay $$Lambda_c^{+} rightarrow pK^+pi^-$$ 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 $${cal B}(Lambda_c^{+} rightarrow pK^+pi^-)/{cal B}(Lambda_c^{+} rightarrow pK^+pi^+)=(2.35 pm 0.27 pm 0.21)times 10^{-3}$$, where the uncertainties are statistical and systematic, respectively.

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