First Observation of the Doubly Cabibbo-Suppressed Decay of a Charmed Baryon: Λ_{c}^{+}→pK^{+}π^{-}. S B Yang , K Tanida , B H Kim , I Adachi , H Aihara , D M Asner , V Aulchenko , T Aushev , V Babu , I Badhrees , A M Bakich , E Barberio , V Bhardwaj , B Bhuyan , J Biswal , G Bonvicini , A Bozek , M Bračko , T E Browder , D Červenkov , V Chekelian , A Chen , B G Cheon , K Chilikin , R Chistov , K Cho , V Chobanova , Y Choi , D Cinabro , J Dalseno , M Danilov , N Dash , Z Doležal , Z Drásal , D Dutta , S Eidelman , H Farhat , J E Fast , T Ferber , B G Fulsom , N Gabyshev , A Garmash , V Gaur , R Gillard , Y M Goh , P Goldenzweig , D Greenwald , J Grygier , J Haba , P Hamer , T Hara , K Hayasaka , H Hayashii , W-S Hou , T Iijima , K Inami , G Inguglia , A Ishikawa , R Itoh , Y Iwasaki , W W Jacobs , I Jaegle , H B Jeon , K K Joo , T Julius , K H Kang , E Kato , P Katrenko , C Kiesling , D Y Kim , H J Kim , J B Kim , K T Kim , M J Kim , S H Kim , S K Kim , Y J Kim , K Kinoshita , N Kobayashi , P Kodyš , S Korpar , P Križan , P Krokovny , T Kuhr , A Kuzmin , Y-J Kwon , J S Lange , I S Lee , C H Li , H Li , L Li , Y Li , L Li Gioi , J Libby , D Liventsev , M Lubej , M Masuda , D Matvienko , K Miyabayashi , H Miyata , R Mizuk , G B Mohanty , A Moll , H K Moon , R Mussa , E Nakano , M Nakao , T Nanut , K J Nath , M Nayak , K Negishi , M Niiyama , N K Nisar , S Nishida , S Ogawa , S Okuno , S L Olsen , G Pakhlova , B Pal , C W Park , H Park , T K Pedlar , R Pestotnik , M Petrič , L E Piilonen , C Pulvermacher , J Rauch , M Ritter , A Rostomyan , S Ryu , H Sahoo , Y Sakai , S Sandilya , L Santelj , T Sanuki , Y Sato , V Savinov , T Schlüter , O Schneider , G Schnell , C Schwanda , A J Schwartz , Y Seino , K Senyo , O Seon , I S Seong , M E Sevior , V Shebalin , T-A Shibata , J-G Shiu , B Shwartz , F Simon , Y-S Sohn , A Sokolov , S Stanič , M Starič , J Stypula , M Sumihama , T Sumiyoshi , M Takizawa , U Tamponi , Y Teramoto , K Trabelsi , V Trusov , M Uchida , T Uglov , Y Unno , S Uno , P Urquijo , Y Usov , P Vanhoefer , G Varner , K E Varvell , A Vinokurova , A Vossen , M N Wagner , C H Wang , M-Z Wang , P Wang , X L Wang , Y Watanabe , K M Williams , E Won , J Yamaoka , S Yashchenko , H Ye , J Yelton , C Z Yuan , Y Yusa , Z P Zhang , V Zhilich , V Zhulanov , A Zupanc PHYSICAL REVIEW LETTERS（2016）
摘要
We report the first observation of the decay Lambda(+)(c) -> 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 B(Lambda(+)(c) -> pK(+)pi(-))/B(Lambda(+)(c) -> pK(-)pi(+)) = (2.35 +/- 0.27 +/- 0.21) x 10(-3), where the uncertainties are statistical and systematic, respectively.
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