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First observation of doubly-Cabibbo-suppressed decay in the baryon sector at Belle; $$Lambda_{c}$$ $$rightarrow$$ $$pK^{+}$$$$pi^{-}$$

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

谷田 聖   

Tanida, Kiyoshi

Doubly Cabibbo suppressed decay of a charmed baryon, $$Lambda_c to p K^+ pi^-$$ is observed for the first time. The branching ratio is measured with respect to its couterpart, $$Lambda_c to p K^- pi^+$$. The result will be reported and compared to naive expectation, $$tan^4theta_c = 2.8times10^{-3}$$.

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