Evidence for CP violation in B-0 -> D+D- decays

  • Fratina, S.
  • Abe, K.
  • Abe, K.
  • Adachi, I.
  • Aihara, H.
  • ... Cheon, Byung Gu
  • 외 151명
Citations

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26
Citations

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39

초록

We report measurements of the branching fraction and CP violation parameters in B-0 -> D+D- decays. The results are based on a data sample that contains 535x10(6) B(B) over bar pairs collected at the Upsilon(4S) resonance, with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. We obtain [1.97 +/- 0.20(stat)+/- 0.20(syst)]x10(-4) for the branching fraction of B-0 -> D+D-. The measured values of the CP violation parameters are S=-1.13 +/- 0.37 +/- 0.09, A=0.91 +/- 0.23 +/- 0.06, where the first error is statistical and the second is systematic. We find evidence of CP violation in B-0 -> D+D- at the 4.1 sigma confidence level. While the value of S is consistent with expectations from other measurements, the value of the parameter A favors large direct CP violation at the 3.2 sigma confidence level, in contradiction to standard model expectations.

키워드

B DECAYSBELLEASYMMETRIESDETECTORPHYSICS
제목
Evidence for CP violation in B-0 -> D+D- decays
저자
Fratina, S.Abe, K.Abe, K.Adachi, I.Aihara, H.Anipko, D.Arinstein, K.Aushev, T.Bakich, A. M.Barberio, E.Bay, A.Belous, K.Bitenc, U.Bizjak, I.Bondar, A.Bozek, A.Bracko, M.Brodzicka, J.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.Go, A.Golob, B.Gorisek, A.Ha, H.Haba, J.Hara, K.Hazumi, M.Heffernan, D.Hokuue, T.Hoshi, Y.Hou, W.-S.Iijima, T.Inami, K.Ishikawa, A.Ishino, H.Itoh, R.Iwasaki, M.Iwasaki, Y.Kaji, H.Kang, J. H.Katayama, N.Kawai, H.Kawasaki, T.Kichimi, H.Kim, H. J.Kim, H. O.Kim, S. K.Kim, Y. J.Kinoshita, K.Korpar, S.Krizan, P.Krokovny, P.Kulasiri, R.Kumar, R.Kuo, C. C.Kuzmin, A.Kwon, Y.-J.Lee, M. J.Lee, S. E.Lesiak, T.Limosani, A.Lin, S.-W.Liventsev, D.Mandl, F.Matsumoto, T.Matyja, A.McOnie, S.Medvedeva, T.Mitaroff, W.Miyabayashi, K.Miyake, H.Miyata, H.Miyazaki, Y.Mizuk, R.Moloney, G. R.Mori, T.Nakano, E.Nakao, M.Nakazawa, H.Nishida, S.Noguchi, S.Ogawa, S.Ohshima, T.Okuno, S.Olsen, S. L.Onuki, Y.Ozaki, H.Pakhlov, P.Pakhlova, G.Park, C. W.Park, H.Peak, L. S.Pestotnik, R.Piilonen, L. E.Sakai, Y.Satoyama, N.Schietinger, T.Schneider, O.Schuemann, J.Schwanda, C.Schwartz, A. J.Senyo, K.Sevior, M. E.Shapkin, M.Shibuya, H.Shwartz, B.Singh, J. B.Somov, A.Soni, N.Stanic, S.Staric, M.Stoeck, H.Sumiyoshi, T.Takasaki, F.Tamai, K.Tanaka, M.Teramoto, Y.Tian, X. C.Tikhomirov, I.Trabelsi, K.Tsukamoto, T.Uehara, S.Ueno, K.Uglov, T.Unno, Y.Uno, S.Urquijo, P.Usov, Y.Varner, G.Varvell, K. E.Vervink, K.Villa, S.Wang, C. H.Watanabe, Y.Won, E.Yabsley, B. D.Yamaguchi, A.Yamashita, Y.Yamauchi, M.Zhang, C. C.Zhang, Z. P.Zhilich, V.Zupanc, A.
DOI
10.1103/PhysRevLett.98.221802
발행일
2007-06
유형
Article
저널명
Physical Review Letters
98
22
페이지
1 ~ 6

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