Evidence for the Suppressed Decay B- -> DK-, D -> K+pi-
High Energy Physics - Experiment
2011-07-25 v2
Abstract
The suppressed decay chain B- -> DK-, D -> K+pi-, where D indicates a anti-D0 or D0 state, provides important information on the CP-violating angle phi_3. We measure the ratio R_{DK} of the decay rates to the favored mode B- -> DK-, D -> K-pi+ to be R_{DK} = [1.63^{+0.44}_{-0.41}(stat)^{+0.07}_{-0.13}(syst)] x 10^{-2}, which indicates the first evidence of the signal with a significance of 4.1sigma. We also measure the asymmetry A_{DK} between the charge-conjugate decays to be A_{DK} = -0.39^{+0.26}_{-0.28}(stat)^{+0.04}_{-0.03}(syst). The results are based on the full 772 x 10^6 B anti-B pair data sample collected at the Upsilon(4S) resonance with the Belle detector.
Cite
@article{arxiv.1103.5951,
title = {Evidence for the Suppressed Decay B- -> DK-, D -> K+pi-},
author = {Belle Collaboration and Y. Horii and K. Trabelsi and H. Yamamoto and I. Adachi and H. Aihara and K. Arinstein and V. Aulchenko and T. Aushev and V. Balagura and E. Barberio and K. Belous and B. Bhuyan and M. Bischofberger and A. Bozek and M. Bracko and T. E. Browder and M. -C. Chang and P. Chang and A. Chen and P. Chen and B. G. Cheon and C. -C. Chiang and I. -S. Cho and K. Cho and Y. Choi and Z. Dolezal and S. Eidelman and M. Feindt and V. Gaur and N. Gabyshev and A. Garmash and B. Golob and H. Ha and J. Haba and K. Hayasaka and Y. Hoshi and W. -S. Hou and Y. B. Hsiung and H. J. Hyun and T. Iijima and K. Inami and A. Ishikawa and R. Itoh and M. Iwabuchi and Y. Iwasaki and T. Iwashita and N. J. Joshi and T. Julius and J. H. Kang and T. Kawasaki and H. Kichimi and C. Kiesling and H. J. Kim and H. O. Kim and M. J. Kim and Y. J. Kim and K. Kinoshita and B. R. Ko and N. Kobayashi and S. Korpar and P. Krizan and T. Kuhr and R. Kumar and Y. -J. Kwon and M. J. Lee and S. -H. Lee and J. Li and C. Liu and D. Liventsev and R. Louvot and A. Matyja and S. McOnie and K. Miyabayashi and H. Miyata and Y. Miyazaki and G. B. Mohanty and A. Moll and T. Mori and N. Muramatsu and E. Nakano and H. Nakazawa and Z. Natkaniec and S. Neubauer and S. Nishida and O. Nitoh and T. Ohshima and S. Okuno and Y. Onuki and P. Pakhlov and G. Pakhlova and C. W. Park and H. K. Park and R. Pestotnik and M. Petric and L. E. Piilonen and A. Poluektov and M. Prim and K. Prothmann and M. Röhrken and S. Ryu and H. Sahoo and Y. Sakai and O. Schneider and C. Schwanda and A. J. Schwartz and K. Senyo and O. Seon and M. E. Sevior and M. Shapkin and V. Shebalin and C. P. Shen and T. -A. Shibata and J. -G. Shiu and F. Simon and P. Smerkol and Y. -S. Sohn and E. Solovieva and S. Stanic and M. Staric and M. Sumihama and T. Sumiyoshi and S. Suzuki and S. Tanaka and Y. Teramoto and M. Uchida and S. Uehara and T. Uglov and Y. Unno and S. Uno and Y. Usov and G. Varner and A. Vinokurova and A. Vossen and C. H. Wang and P. Wang and M. Watanabe and Y. Watanabe and J. Wicht and E. Won and B. D. Yabsley and Y. Yamashita and D. Zander and Z. P. Zhang and V. Zhulanov and A. Zupanc},
journal= {arXiv preprint arXiv:1103.5951},
year = {2011}
}
Comments
6 pages, 2 figures, 2 tables, accepted by Physical Review Letters