Observation of direct CP violation in B-0 ->pi(+)pi(-) decays and model-independent constraints on the quark-mixing angle phi(2)

  • Ishino, H.
  • Abe, K.
  • Abe, K.
  • Adachi, I.
  • Aihara, H.
  • ... Cheon, Byung Gu
  • 외 156명
Citations

WEB OF SCIENCE

47
Citations

SCOPUS

80

초록

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 <phi(2)< 79 degrees at the 95% confidence level.

제목
Observation of direct CP violation in B-0 ->pi(+)pi(-) decays and model-independent constraints on the quark-mixing angle phi(2)
저자
Ishino, H.Abe, K.Abe, K.Adachi, I.Aihara, H.Anipko, D.Arinstein, K.Aushev, T.Bakich, A. M.Barberio, E.Barbero, M.Bedny, I.Bitenc, U.Bizjak, I.Blyth, S.Bozek, A.Bracko, M.Browder, T. E.Chang, M.-C.Chang, P.Chao, Y.Chen, A.Chen, K.-F.Chen, W. T.Cheon, Byung GuChistov, R.Choi, Y.Choi, Y. K.Cole, S.Dalseno, J.Dash, M.Drutskoy, A.Eidelman, S.Fratina, S.Gershon, T.Go, A.Gokhroo, G.Golob, B.Gorisek, A.Ha, H.Haba, J.Hara, K.Hayasaka, K.Hazumi, M.Heffernan, D.Hokuue, T.Hoshi, Y.Hou, S.Hsiung, Y. B.Iijima, T.Imoto, A.Inami, K.Ishikawa, A.Iwasaki, Y.Kang, J. H.Kapusta, P.Kataoka, S. U.Katayama, N.Kawai, H.Kawasaki, T.Khan, H. R.Kibayashi, A.Kichimi, H.Kinoshita, K.Korpar, S.Krizan, P.Krokovny, P.Kulasiri, R.Kumar, R.Kuo, C. C.Kusaka, A.Kuzmin, A.Kwon, Y.-J.Lee, M. J.Lee, S. E.Lesiak, T.Limosani, A.Lin, S.-W.MacNaughton, J.Mandl, F.Marlow, D.Matsumoto, T.Matyja, A.McOnie, S.Mitaroff, W.Miyabayashi, K.Miyake, H.Miyata, H.Miyazaki, Y.Mizuk, R.Mohapatra, D.Nagasaka, Y.Nakano, E.Nakao, M.Nishida, S.Nitoh, O.Nozaki, T.Ogawa, S.Ohshima, T.Olsen, S. L.Onuki, Y.Ozaki, H.Pakhlov, P.Pakhlova, G.Park, H.Peak, L. S.Pestotnik, R.Piilonen, L. E.Sahoo, H.Sakai, Y.Satoyama, N.Schietinger, T.Schneider, O.Schuemann, J.Schwanda, C.Schwartz, A. J.Seidl, R.Senyo, K.Sevior, M. E.Shibuya, H.Shwartz, B.Somov, A.Soni, N.Stanic, S.Staric, M.Stoeck, H.Sumisawa, K.Sumiyoshi, T.Suzuki, S. Y.Tajima, O.Takasaki, F.Tamai, K.Tamura, N.Tanaka, M.Teramoto, Y.Tian, X. C.Trabelsi, K.Tsukamoto, T.Uehara, S.Ueno, K.Unno, Y.Uno, S.Urquijo, P.Ushiroda, Y.Usov, Y.Varner, G.Varvell, K. E.Villa, S.Wang, C. H.Wang, M.-Z.Watanabe, Y.Won, E.Wu, C.-H.Xie, Q. L.Yabsley, B. D.Yamaguchi, A.Yamashita, Y.Yamauchi, M.Zhang, L. M.Zhang, Z. P.Zhilich, V.Zupanc, A.
DOI
10.1103/PhysRevLett.98.211801
발행일
2007-05
유형
Article
저널명
Physical Review Letters
98
21
페이지
1 ~ 6

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