Observation of B0 -->D0K0 and B0 -->D0K*0 decays.

P Krokovny,K Tamai,Y Hoshi,M Danilov,O Schneider,T Iijima,N Katayama,H Park,P Kapusta,A Sugi,A Kuzmin,S Nishida,A Satpathy,S Ogawa,T Aushev,B Shwartz,S L Olsen,Y Sakai,M Starič,C C Zhang,Y Teramoto,P Chang,M Nakao,L E Piilonen,J Tanaka,K Sumisawa,T Ohshima,H Nakazawa,T Higuchi,A Garmash,J Macnaughton,R Itoh,O Nitoh,G Leder,K Hasuko,T Kawasaki,Z Natkaniec,T Okabe,T Tomura,T Hara,Z P Zhang,H Shibuya,S Eidelman,T Nagamine,T Tsuboyama,J Schümann,T Nakadaira,S Uehara,S Tokuda,Y Onuki,T Hojo,C H Wang,F Mandl,T Matsuishi,N Gabyshev,T Tsukamoto,K Inami,H Ozaki,J Haba,E Nakano,S Okuno,V Eiges,Y Yamashita,S Matsumoto,A Drutskoy,G N Taylor,M Bračko,H Miyake,Y Igarashi,E Won,A Bay,Y Asano,I Bedny,T Sumiyoshi,A M Bakich,I Adachi,S Uno,Y Choi,S Semenov,K Senyo,Y Ban,M Yamauchi,F Takasaki,J H Kang,K Miyabayashi,M Satapathy,T E Browder,S Schrenk,P Pakhlov,M E Sevior,H Hayashii,H Miyata,Y Iwasaki,J S Lange,H Kichimi,A Yamaguchi,S H Lee,A Ishikawa,D Liventsev,K Rybicki,I Higuchi,Y Yusa,T Matsumoto,W Ostrowicz,D Žontar,H Kawai,M Akatsu,R Chistov,M Tanaka ,B G Cheon ,Y Chào ,G Majumder ,Hyun Woo Kim ,M Różańska ,H O Kim ,Haruo Yanai ,H Iwasaki ,V Sidorov ,M Hazumi ,G Varner ,Abe T ,S Stanič ,J S Kang ,J W Nam ,H Sagawa ,T Takahashi ,S K Swain ,Hsuan‐Cheng Huang ,B C.k Casey ,J H Kim ,W.-S Hou ,M Peters ,N Tamura ,J G Wang ,H J Kim ,P Koppenburg ,Y Unno ,C Fukunaga ,Y Kawakami ,Kazuo Abe ,K E Varvell ,Y Nagasaka ,S W Lin ,T Gershon ,Y Yamada ,W Mitaroff ,S Kobayashi ,J Kaneko ,V Zhilich ,H Pałka ,C C Wang ,J B Singh ,T Aso ,S K Choi ,J Brodzicka ,S Suzuki ,A Bondar ,R Seuster ,D W Kim ,C W Park ,Y J Kwon ,V Aulchenko ,Y Enari ,A Bożek ,B Yabsley ,H Aihara ,K F Chen

doi:10.1103/physrevlett.90.141802

Abstract

We report on a search for B(0)-->D(*0)K(*0) decays based on 85 x 10(6) BB events collected with the Belle detector at KEKB. The B(0)-->D0K(0) and B(0)-->D0K(*0) decays have been observed for the first time with the branching fractions B(B(0)-->D0K(0))=(5.0(+1.3)(-1.2)+/-0.6)x10(-5) and B(B(0)-->D0K(*0))=(4.8(+1.1)(-1.0)+/-0.5)x10(-5). No significant signal has been found for the B(0)-->D(*0)K*0) and B(0)-->D(*0)K(*0) decay modes, and upper limits at 90% C.L. are presented.

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