Measurement ofD0−D¯0Mixing Parameters inD0→Ksπ+π−Decays

L M Zhang,T Uglov,P Chang,W Ostrowicz,K Vervink,S Mconie,K Hayasaka,C Z Yuan,C H Wang,S Nishida,M Starič,H Kawai,L S Peak,T Kawasaki,K Sumisawa,E Nakano,P Krokovny,T Hara,Y Usov,K Inami,D Heffernan,A Yamaguchi,O Nitoh,A Vinokurova,S Korpar,K Senyo,H Ha,T Sumiyoshi,T Aushev,M Iwasaki,S L Olsen,Y Hoshi,R Itoh,A J Schwartz,A Ishikawa,F Takasaki,S Uehara,C Schwanda,B G Cheon,T Matsumoto,K Belous,K Tamai,Y Teramoto,K Ikado,H Ozaki,M Bračko,Y Choi,H Sahoo,M E Sevior,H Kichimi,Y Yamashita,J H Kang,Y Watanabe,T Lesiak,P Pakhlov,M Yamauchi,J Haba,Z P Zhang,H Miyake,A Somov,M J Lee,C C Zhang,A Zupanc,S Shinomiya,Y Onuki,N Gabyshev,T Ohshima,S Ogawa,H Park,G Gokhroo,T E Browder,I Adachi,B Shwartz,A Drutskoy,T Hokuue,D H Kah,S Kajiwara,R Mizuk,I Tikhomirov,S Okuno,M Nakao,H J Hyun,T Iijima,M Danilov,P Križan,J Schümann,G Pakhlova,O Schneider,H Shibuya,Y Sakai,N Soni,X C Tian,D Epifanov,Z Natkaniec,E Won,S Villa,T Tsuboyama,A M Bakich,K Ueno,K Kinoshita,R Seidl,S Fratina,H Miyata,D Liventsev,S Uno,M Shapkin,Y Miyazaki,R Pestotnik,G N Taylor,H Stoeck,N C Hastings,U Bitenc,B Golob,N J Joshi,L E Piilonen,A Kuzmin,J Dalseno,A Bay,A Chen,H Hayashii,I Nakamura,S Eidelman,A Matyja,I S Cho ,M Z Wang ,N Tamura,A Sokolov,J G Shiu ,S Stanič,H O Kim,H J Kim,H Ishino,J Brodzicka,V Zhilich,Y Nagasaka,M Tanaka,A Limosani,B Yabsley ,J S Lee,C C Kuo,Y Liu,Y Hsiung ,C W Park,A Bondar,W T Chen,A Poluektov,W Mitaroff,A Bożek ,P Urquijo,T Medvedeva,J B Singh,P Wang,Y.-J Kwon,S W Lin ,S K Kim,M Dash,J Li,Y Unno,V Aulchenko,E L Barberio ,V Balagura,Y Chào ,Hiroshi Kaji ,S Suzuki,H Aihara,O Tajima,K F Chen ,Y J Kim,G Varner,R Kumar,C C Chiang ,M Hazumi,W.-S Hou,S E Lee

doi:10.1103/physrevlett.99.131803

Abstract

We report a measurement of D0−D¯0 mixing parameters in D0→KS0π+π− decays using a time-dependent Dalitz-plot analysis. We first assume CP conservation and subsequently allow for CP violation. The results are based on 540 fb−1 of data accumulated with the Belle detector at the KEKB e+e− collider. Assuming negligible CP violation, we measure the mixing parameters x=(0.80±0.29−0.07−0.14+0.09+0.10)% and y=(0.33±0.24−0.12−0.08+0.08+0.06)%, where the errors are statistical, experimental systematic, and systematic due to the Dalitz decay model, respectively. Allowing for CP violation, we obtain the CP-violating parameters |q/p|=0.86−0.29−0.03+0.30+0.06±0.08 and arg(q/p)=(−14−18−3−4+16+5+2)°.Received 21 June 2007DOI:https://doi.org/10.1103/PhysRevLett.99.131803©2007 American Physical Society

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