Observation of large CP violation and evidence for direct CP violation in B0-->pi(+)pi(-) decays.

K Abe,N Abe,T Abe, I Adachi,H Aihara, K Akai,M Akatsu,M Akemoto,Y Asano,T Aso,V Aulchenko,T Aushev, A M Bakich, Y Ban,S Banerjee, A Bay, I Bedny, I Bizjak, A Bondar,A Bozek, M Bracko, T E Browder, Y Chao, K F Chen, B G Cheon,R Chistov,S K Choi, Y Choi, A Chuvikov,S Cole, M Danilov, J Dragic,A Drutskoy,S Eidelman,V Eiges, Y Enari,D Epifanov, J Flanagan, K Furukawa,N Gabyshev,A Garmash, T Gershon, B Golob,J Haba, K Hara, N C Hastings, H Hayashii,M Hazumi,L Hinz,T Hokuue, Y Hoshi,W S Hou,Y B Hsiung,H C Huang, T Iijima,H Ikeda,K Inami, A Ishikawa,H Ishino,R Itoh, H Iwasaki,M Iwasaki, Y Iwasaki, H Kakuno, T Kamitani,J H Kang,J S Kang,P Kapusta,S U Kataoka,N Katayama,H Kawai, T Kawasaki,A Kibayashi, H Kichimi,E Kikutani, H J Kim, J H Kim,S K Kim,K Kinoshita,P Koppenburg, S Korpar, P Krizan,P Krokovny,S Kumar, A Kuzmin,Y J Kwon, J S Lange,G Leder,S H Lee,Y J Lee,T Lesiak, J Li, A Limosani,S W Lin,D Liventsev, J MacNaughton, F Mandl,D Marlow, H Matsumoto,T Matsumoto, A Matyja,S Michizono,T Mimashi,W Mitaroff,K Miyabayashi,H Miyake,H Miyata,D Mohapatra, G R Moloney,A Murakami,T Nagamine, Y Nagasaka,T Nakadaira, T T Nakamura, E Nakano, M Nakao,H Nakazawa,Z Natkaniec, K Neichi,S Nishida,O Nitoh,S Noguchi,T Nozaki,S Ogawa,Y Ogawa, K Ohmi, T Ohshima, N Ohuchi,K Oide,T Okabe, S Okuno,S L Olsen,W Ostrowicz,H Ozaki,P Pakhlov, H Palka, C W Park,H Park,N Parslow, L E Piilonen,N Root, M Rozanska,H Sagawa, Y Sakai,O Schneider,J Schümann, C Schwanda,A J Schwartz, S Semenov,K Senyo,H Shibuya, T Shidara,B Shwartz, V Sidorov,J B Singh,N Soni, R Stamen,S Stanic, M Staric, R Sugahara, K Sumisawa, T Sumiyoshi,K Suzuki,S Suzuki,O Tajima, F Takasaki, K Tamai,N Tamura,M Tanaka, M Tawada,Y Teramoto,T Tomura,T Tsuboyama, T Tsukamoto, S Uehara,T Uglov,K Ueno, Y Unno,S Uno, G Varner, K E Varvell,C C Wang,C H Wang, M Z Wang, Y Watanabe,B D Yabsley,Y Yamada,A Yamaguchi,Y Yamashita,M Yamauchi,H Yanai, Heyoung Yang, J Ying,M Yokoyama,M Yoshida,Y Yusa, C C Zhang, Z P Zhang,T Ziegler, D Zontar,D Zürcher

Physical review letters（2004）

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摘要

We report the first observation of CP violation in B0-->pi(+)pi(-) decays based on 152x10(6) gamma (4S)-->BB decays collected with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. We reconstruct a B0-->pi(+)pi(-) CP eigenstate and identify the flavor of the accompanying B meson from its decay products. From the distribution of the time intervals between the two B meson decay points, we obtain A(pipi)=+0.58+/-0.15(stat)+/-0.07(syst) and S(pipi)=-1.00+/-0.21(stat)+/-0.07(syst). We rule out the CP-conserving case, A(pipi)=S(pipi)=0, at a level of 5.2 standard deviations. We also find evidence for direct CP violation with a significance at or greater than 3.2 standard deviations for any S(pipi) value.

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