Observation Of Direct Cp Violation In B-0 ->Pi(+)Pi(-) Decays And Model-Independent Constraints On The Quark-Mixing Angle Phi(2)

H. Ishino,K. Abe,I. Adachi,H. Aihara,D. Anipko,K. Arinstein,T. Aushev,A. M. Bakich,E. Barberio,M. Barbero,I. Bedny,U. Bitenc,I. Bizjak,S. Blyth, A. Bozek,M. Bračko,T. E. Browder,M.-C. Chang,P. Chang,Y. Chao,A. Chen,K.-F. Chen,W. T. Chen,B. G. Cheon,R. Chistov, Y. Choi,Y. K. Choi,S. Cole,J. Dalseno,M. Dash,A. Drutskoy,S. Eidelman,S. Fratina,T. Gershon,A. Go,G. Gokhroo,B. Golob,A. Gorišek,H. Ha,J. Haba,K. Hara,K. Hayasaka,M. Hazumi,D. Heffernan,T. Hokuue,Y. Hoshi,S. Hou,Y. B. Hsiung,T. Iijima,A. Imoto,K. Inami,A. Ishikawa,Y. Iwasaki,J. H. Kang,P. Kapusta,S. U. Kataoka,N. Katayama,H. Kawai,T. Kawasaki,H. R. Khan,A. Kibayashi,H. Kichimi,K. Kinoshita,S. Korpar,P. Križan,P. Krokovny,R. Kulasiri,R. Kumar,C. C. Kuo,A. Kusaka,A. Kuzmin,Y.-J. Kwon,M. J. Lee,S. E. Lee,T. Lesiak,A. Limosani,S.-W. Lin,J. MacNaughton,F. Mandl,D. Marlow,T. Matsumoto,A. Matyja,S. McOnie,W. Mitaroff,K. Miyabayashi,H. Miyake,H. Miyata,Y. Miyazaki,R. Mizuk,D. Mohapatra,Y. Nagasaka,E. Nakano,M. Nakao,S. Nishida,O. Nitoh,T. Nozaki,S. Ogawa,T. Ohshima,S. L. Olsen,Y. Onuki,H. Ozaki,P. Pakhlov,G. Pakhlova,H. Park,L. S. Peak,R. Pestotnik,L. E. Piilonen,H. Sahoo,Y. Sakai,N. Satoyama,T. Schietinger,O. Schneider,J. Schümann,C. Schwanda,A. J. Schwartz,R. Seidl,K. Senyo,M. E. Sevior,H. Shibuya,B. Shwartz,A. Somov,N. Soni,S. Stanič,M. Starič,H. Stoeck,K. Sumisawa,T. Sumiyoshi,S. Y. Suzuki,O. Tajima,F. Takasaki,K. Tamai,N. Tamura,M. Tanaka,Y. Teramoto,X. C. Tian,K. Trabelsi,T. Tsukamoto,S. Uehara,K. Ueno,Y. Unno,S. Uno,P. Urquijo,Y. Ushiroda,Y. Usov,G. Varner,K. E. Varvell,S. Villa,C. H. Wang,M.-Z. Wang,Y. Watanabe,E. Won,C.-H. Wu,Q. L. Xie,B. D. Yabsley,A. Yamaguchi,Y. Yamashita,M. Yamauchi,L. M. Zhang,Z. P. Zhang,V. Zhilich,A. Zupanc

PHYSICAL REVIEW LETTERS（2007）

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摘要

We report a new measurement of the time-dependent CP-violating parameters in B-0 ->pi(+)pi(-) decays with 535x10(6) B (B) over bar pairs collected with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider operating at the Upsilon(4S) resonance. We find 1464 +/- 65 B-0 ->pi(+)pi(-) events and measure the CP-violating parameters S-pi pi=-0.61 +/- 0.10(stat)+/- 0.04(syst) and A(pi pi)=+0.55 +/- 0.08(stat)+/- 0.05(syst). We observe large direct CP violation with a significance greater than 5 standard deviations for any S-pi pi value. Using isospin relations, we measure the Cabibbo-Kobayashi-Maskawa quark-mixing matrix angle phi(2)=(97 +/- 11)degrees for the solution consistent with the standard model and exclude the range 11 degrees 更多

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