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

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Horii, Y., Trabelsi, K., Yamamoto, H., Adachi, I., Aihara, H., Arinstein, K., Aulchenko, V., Aushev, T., Balagura, V., Barberio, E., Belous, K., Bhuyan, B., Bischofberger, M., Bozek, A., Bračko, M., Browder, T. E., Chang, M. C., Chang, P., Chen, A., ... Zupanc, A. (2011). Evidence for the suppressed decay B-→DK-, D→K+π-. Physical Review Letters, 106(23), [231803]. https://doi.org/10.1103/PhysRevLett.106.231803