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
We report the first observation of the decay Λ_{c}^{+}→pK^{+}π^{-} 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(Λ_{c}^{+}→pK^{+}π^{-})/B(Λ_{c}^{+}→pK^{-}π^{+})=(2.35±0.27±0.21)×10^{-3}, where the uncertainties are statistical and systematic, respectively.
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