Evidence for the suppressed decay B-→DK-, D→K+π-

Y. Horii, K. Trabelsi, H. Yamamoto, I. Adachi, H. Aihara, K. Arinstein, V. Aulchenko, T. Aushev, V. Balagura, E. Barberio, K. Belous, B. Bhuyan, M. Bischofberger, A. Bozek, M. Bračko, T. E. Browder, M. C. Chang, P. Chang, A. Chen, P. ChenB. G. Cheon, C. C. Chiang, I. S. Cho, K. Cho, Y. Choi, Z. Doleal, S. Eidelman, M. Feindt, V. Gaur, N. Gabyshev, A. Garmash, B. Golob, H. Ha, J. Haba, K. Hayasaka, Y. Hoshi, W. S. Hou, Y. B. Hsiung, H. J. Hyun, T. Iijima, K. Inami, A. Ishikawa, R. Itoh, M. Iwabuchi, Y. Iwasaki, T. Iwashita, N. J. Joshi, T. Julius, J. H. Kang, T. Kawasaki, H. Kichimi, C. Kiesling, H. J. Kim, H. O. Kim, M. J. Kim, Y. J. Kim, K. Kinoshita, B. R. Ko, N. Kobayashi, S. Korpar, P. Krian, T. Kuhr, R. Kumar, Y. J. Kwon, M. J. Lee, S. H. Lee, J. Li, C. Liu, D. Liventsev, R. Louvot, A. Matyja, S. McOnie, K. Miyabayashi, H. Miyata, Y. Miyazaki, G. B. Mohanty, A. Moll, T. Mori, N. Muramatsu, E. Nakano, H. Nakazawa, Z. Natkaniec, S. Neubauer, S. Nishida, O. Nitoh, T. Ohshima, S. Okuno, Y. Onuki, P. Pakhlov, G. Pakhlova, C. W. Park, H. K. Park, R. Pestotnik, M. Petrič, L. E. Piilonen, A. Poluektov, M. Prim, K. Prothmann, M. Röhrken, S. Ryu, H. Sahoo, Y. Sakai, O. Schneider, C. Schwanda, A. J. Schwartz, K. Senyo, O. Seon, M. E. Sevior, M. Shapkin, V. Shebalin, C. P. Shen, T. A. Shibata, J. G. Shiu, F. Simon, P. Smerkol, Y. S. Sohn, E. Solovieva, S. Stanič, M. Starič, M. Sumihama, T. Sumiyoshi, S. Suzuki, S. Tanaka, Y. Teramoto, M. Uchida, S. Uehara, T. Uglov, Y. Unno, S. Uno, Y. Usov, G. Varner, A. Vinokurova, A. Vossen, C. H. Wang, P. Wang, M. Watanabe, Y. Watanabe, J. Wicht, E. Won, B. D. Yabsley, Y. Yamashita, D. Zander, Z. P. Zhang, V. Zhulanov, A. Zupanc

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Abstract

The suppressed decay chain B-→DK-, D→K +π-, where D indicates a D̄0 or D0 state, provides important information on the CP-violating angle ?3. We measure the ratio RDK of the decay rates to the favored mode B-→DK-, D→K-π+ to be RDK=[1.63-0.41+0.44(stat)-0.13+0.07(syst)]×10-2, which indicates the first evidence of the signal with a significance of 4.1σ. We also measure the asymmetry ADK between the charge-conjugate decays to be ADK=-0.39-0.28+0.26(stat)-0.03+0. 04(syst). The results are based on the full 772×106 BB̄ pair data sample collected at the Υ(4S) resonance with the Belle detector.

Original languageEnglish
Article number231803
JournalPhysical review letters
Volume106
Issue number23
DOIs
Publication statusPublished - 2011 Jun 10

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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