First Observation of the Doubly Cabibbo-Suppressed Decay of a Charmed Baryon:Λc+→pK+π−

First Observation of the Doubly Cabibbo-Suppressed Decay of a Charmed Baryon:Λc+→pK+π−

Seongbae Yang,Kiyoshi 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,Daniel Červenkov,V. Chekelian,A. Chen,B. G. Cheon,Kirill Chilikin,R. Chistov,K. Cho,V. Chobanova,Y. Choi,D. Cinabro,Jeremy Dalseno,Mikhail Danilov,N. Dash,Zdeněk 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,Takanori Hara,K. Hayasaka,H. Hayashii,W.-S. Hou,T. Iijima,K. Inami,Gianluca 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,Y. J. Kim,K. Kinoshita,N. Kobayashi,Peter Kodyš,S. Korpar,Peter 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,Shohei Nishida,S. Ogawa,S. Okuno,S. L. Olsen,Galina Pakhlova,B. Pal,C. W. Park,H. Park,T. K. Pedlar,R. Pestotnik,M. Petrič,L. E. Piilonen,C. Pulvermacher,J. Rauch,M. Ritter,Armine 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,Martin Sevior,V. Shebalin,T.-A. Shibata,J.-G. Shiu,B. Shwartz,Frank Simon,Y.-S. Sohn,A. Sokolov,S. Stanič,M. Starič,J. Stypula,M. Sumihama,T. Sumiyoshi,M. Takizawa,U. Tamponi,Y. Teramoto,Karim Trabelsi,V. Trusov,M. Uchida,T. Uglov,Y. Unno,S. Uno,Phillip Urquijo,Y. Usov,P. Vanhoefer,G. Varner,K. E. Varvell,A. Vinokurova,Anselm Vossen,M. N. Wagner,C. H. Wang,Min-Zu Wang,P. Wang,X. L. Wang,Y. Watanabe,K. M. Williams,E. Won,J. Yamaoka,S. Yashchenko,H. Ye,J. Yelton,Chang-Zheng Yuan,Y. Yusa,Z. P. Zhang,V. Zhilich,V. Zhulanov,A. Zupanc,Belle Collaboration,S. K. Kim;Seongbae Yang;Kiyoshi 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;Daniel Červenkov;V. Chekelian;A. Chen;B. G. Cheon;Kirill Chilikin;R. Chistov;K. Cho;V. Chobanova;Y. Choi;D. Cinabro;Jeremy Dalseno;Mikhail Danilov;N. Dash;Zdeněk 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;Takanori Hara;K. Hayasaka;H. Hayashii;W.-S. Hou;T. Iijima;K. Inami;Gianluca 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;Y. J. Kim;K. Kinoshita;N. Kobayashi;Peter Kodyš;S. Korpar;Peter 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;Shohei Nishida;S. Ogawa;S. Okuno;S. L. Olsen;Galina Pakhlova;B. Pal;C. W. Park;H. Park;T. K. Pedlar;R. Pestotnik;M. Petrič;L. E. Piilonen;C. Pulvermacher;J. Rauch;M. Ritter;Armine 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;Martin Sevior;V. Shebalin;T.-A. Shibata;J.-G. Shiu;B. Shwartz;Frank Simon;Y.-S. Sohn;A. Sokolov;S. Stanič;M. Starič;J. Stypula;M. Sumihama;T. Sumiyoshi;M. Takizawa;U. Tamponi;Y. Teramoto;Karim Trabelsi;V. Trusov;M. Uchida;T. Uglov;Y. Unno;S. Uno;Phillip Urquijo;Y. Usov;P. Vanhoefer;G. Varner;K. E. Varvell;A. Vinokurova;Anselm Vossen;M. N. Wagner;C. H. Wang;Min-Zu Wang;P. Wang;X. L. Wang;Y. Watanabe;K. M. Williams;E. Won;J. Yamaoka;S. Yashchenko;H. Ye;J. Yelton;Chang-Zheng Yuan;Y. Yusa;Z. P. Zhang;V. Zhilich;V. Zhulanov;A. Zupanc;Belle Collaboration;S. K. Kim;
physical review letters 2016 Vol. 117 pp. 011801-
171
kim2016physicalfirst

Abstract

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

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272165
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