Evidence for the suppressed decay B^- -> DK^-, D -> K^+\pi^-\pi^0

A. Bala; A. Bozek; A. Chen; A. Ishikawa; A. J. Schwartz; A. Kuzmin; A. M. Bakich; A. Moll; A. Rostomyan; A. Sibidanov

arxiv: 1310.1741 · v2 · pith:3YMCOLJNnew · submitted 2013-10-07 · ✦ hep-ex

Evidence for the suppressed decay B^- -> DK^-, D -> K^+π^-π⁰

Belle Collaboration: M. Nayak , J. Libby , K. Trabelsi , I. Adachi , H. Aihara , D. M. Asner , T. Aushev , A. M. Bakich

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A. Bala P. Behera K. Belous V. Bhardwaj G. Bonvicini A. Bozek M. Bra\v{c}ko T. E. Browder D. \v{C}ervenkov M.-C. Chang P. Chang V. Chekelian A. Chen B. G. Cheon R. Chistov I.-S. Cho K. Cho V. Chobanova Y. Choi D. Cinabro J. Dalseno M. Danilov Z. Dole\v{z}al Z. Dr\'asal D. Dutta S. Eidelman S. Esen H. Farhat J. E. Fast T. Ferber V. Gaur N. Gabyshev S. Ganguly R. Gillard Y. M. Goh B. Golob J. Haba H. Hayashii Y. Horii Y. Hoshi W.-S. Hou H. J. Hyun T. Iijima A. Ishikawa T. Iwashita I. Jaegle T. Julius D. H. Kah E. Kato D. Y. Kim H. J. Kim J. B. Kim M. J. Kim Y. J. Kim K. Kinoshita J. Klucar B. R. Ko P. Kody\v{s} S. Korpar P. Krishnan P. Kri\v{z}an P. Krokovny T. Kuhr T. Kumita A. Kuzmin Y.-J. Kwon S.-H. Lee J. Li Y. Li L. Li Gioi Y. Liu D. Liventsev P. Lukin H. Miyake R. Mizuk G. B. Mohanty A. Moll T. Mori N. Muramatsu R. Mussa Y. Nagasaka M. Nakao E. Nedelkovska K. Negishi C. Ng N. K. Nisar O. Nitoh S. Ogawa S. Okuno Y. Onuki P. Pakhlov G. Pakhlova C. W. Park H. Park T. K. Pedlar M. Petri\v{c} L. E. Piilonen M. Ritter M. R\"ohrken A. Rostomyan H. Sahoo T. Saito Y. Sakai S. Sandilya L. Santelj T. Sanuki V. Savinov O. Schneider G. Schnell C. Schwanda A. J. Schwartz K. Senyo O. Seon M. E. Sevior M. Shapkin C. P. Shen T.-A. Shibata J.-G. Shiu B. Shwartz A. Sibidanov F. Simon Y.-S. Sohn A. Sokolov E. Solovieva M. Stari\v{c} M. Steder Z. Suzuki U. Tamponi G. Tatishvili Y. Teramoto M. Uchida T. Uglov Y. Unno S. Uno P. Urquijo S. E. Vahsen C. Van Hulse P. Vanhoefer G. Varner K. E. Varvell M. N. Wagner C. H. Wang M.-Z. Wang Y. Watanabe K. M. Williams E. Won Y. Yamashita S. Yashchenko Y. Yusa V. Zhilich V. Zhulanov A. Zupanc

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We report a study of the suppressed decay B^- -> DK^-, D -> K^+\pi^-\pi^0, where D denotes either a D^0 or a \bar{D}^0 meson. The decay is sensitive to the CP-violating parameter \phi_3. Using a data sample of 772 x 10^6 B\bar{B} pairs collected at the \Upsilon(4S) resonance with the Belle detector, we measure the ratio of branching fractions of the above suppressed decay to the favored decay B^- -> DK^-, D -> K^-\pi^+\pi^0. Our result is R_{DK} = [1.98 +/- 0.62(stat.) +/- 0.24(syst.)] x 10^{-2}, which indicates the first evidence of the signal for this suppressed decay with a significance of 3.2 standard deviations. We measure the direct CP asymmetry between the suppressed B^- and B^+ decays to be A_{DK} = 0.41 +/- 0.30 (stat.) +/- 0.05 (syst.). We also report measurements for the analogous quantities R_{D\pi} and A_{D\pi} for the decay B^- -> D\pi^-, D -> K^+\pi^-\pi^0.

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Evidence for the suppressed decay B^- -> DK^-, D -> K^+π^-π⁰

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