Evidence for the Suppressed Decay B- -> DK-, D -> K+pi-

Belle Collaboration: Y. Horii , K. Trabelsi , H. Yamamoto , I. Adachi , H. Aihara , K. Arinstein , V. Aulchenko , T. Aushev

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V. Balagura E. Barberio K. Belous B. Bhuyan M. Bischofberger A. Bozek M. Bracko T. E. Browder M.-C. Chang P. Chang A. Chen P. Chen B. G. Cheon C.-C. Chiang I.-S. Cho K. Cho Y. Choi Z. Dolezal 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. Krizan 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. Petric L. E. Piilonen A. Poluektov M. Prim K. Prothmann M. R\"ohrken 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. Stanic M. Staric 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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classification ✦ hep-ex

keywords decayevidenceindicatesmeasurestatsuppressedsystangle

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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.

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Evidence for the Suppressed Decay B- -> DK-, D -> K+pi-

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