Improved measurement of the partial-rateCPasymmetry inB+→K0π+andB−→K0π−decays

Y Unno,S Banerjee,T Tomura,S Okuno,Y Sakai,M Yamauchi,Y Yamashita,K Suzuki,J Tanaka,T Ohshima,M Akatsu,I Adachi,K S Park,N Soni,J Macnaughton,Y Ban,H Miyata,A Ishikawa,T Nakadaira,A Satpathy,H Park,T Aushev,S Uehara,A M Bakich,F Takasaki,M Watanabe,S Korpar,B G Cheon,A Garmash,L S Peak,Y Asano,J Haba,F Mandl,H Miyake,T Sumiyoshi,E Won,H Nakazawa,Y Teramoto,D Liventsev,T Okabe,S Eidelman,S Semenov,H Kawai,A Bay,M Starič,C C Zhang,L E Piilonen,T Iijima,J H Kang,W Ostrowicz,I Bizjak,A Kuzmin,A Yamaguchi,T Nagamine,T Matsumoto,D Žontar,Y Choi,Y Watanabe,T Tsukamoto,Y Hoshi,A J Schwartz,L Hinz,K Ueno,H Hayashii,S Uno,K Kinoshita,R Chistov,T Tsuboyama,T Abe,R Itoh,M Satapathy,Z P Zhang,P Križan,P Kapusta,A Sugi,Z Natkaniec,A Matyja,K Senyo,D Zürcher,V Eiges,C H Wang,K Inami,K Sumisawa,F Handa,S L Olsen,O Nitoh,H Kichimi,I Bedny,F Fang,S H Lee,R Kulasiri,O Schneider,S U Kataoka,S Nishida,H Ozaki,P Krokovny,A Drutskoy,B Golob,T E Browder,P Chang,P Pakhlov,M Nakao,S Ogawa,E Nakano,G Leder,M Bračko,T Hokuue,N Gabyshev,T Nozaki,G N Taylor,M Danilov,J Dragic,J S Lange,N Katayama,M E Sevior,K Trabelsi,T Kawasaki,M.-Z Wang,Saburou Saitoh ,S K Choi ,J P Perroud ,S K Kim,Y Yamada,H Sagawa,T Takahashi,G Varner,H J Kim,Hsuan‐Cheng Huang ,M Hazumi,A Limosani,P K Behera,H X Yang ,N Root,K E Varvell,S Bahinipati,Akira Murakami ,T Mori,Y Enari,A Bożek ,H K Jang,S W Lin ,H Yamamoto,S Kobayashi,J H Kim,Kazuo Abe ,J G Wang,B C.k Casey ,T Seki,S Suzuki,Y Chào ,Y.-J Kwon,H Aihara,Suneel Kumar ,D W Kim,T Gershon,Haruo Yanai ,S Stanič,J Zhang,Y Zheng,J Li,J S Kang,J Brodzicka,T Aso,B Yabsley ,Hyun Woo Kim ,W Mitaroff,M Tanaka,T A Shibata ,H Iwasaki,A Bondar,H Pałka ,D Marlow,S K Swain,M Iwasaki ,W.-S Hou,C W Park,J W Nam,J B Singh,N Kawamura,V Aulchenko,Dong Liu ,Y Nagasaka,Hiroshi Matsumoto ,R S Guo ,K.-F Chen

doi:10.1103/physrevd.68.011103

Abstract

We report an improved measurement of the partial-rate CP asymmetry in B±→K0π± decays. The analysis is based on a data sample of 85×106 BB¯ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB e+e− storage ring. We measure ACP(K0π±)=0.07−0.08+0.09−0.03+0.01, where the first and second errors are statistical and systematic, respectively; the corresponding 90% confidence-level interval is −0.10<ACP(K0π±)<0.22. Received 24 April 2003DOI:https://doi.org/10.1103/PhysRevD.68.011103©2003 American Physical Society

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