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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2005, vol. 94, p. -

Study of the suppressed decays B - → [K +π -] DK - and B - → [K +π -] Dπ -

Saigo M., Abe K., Aihara H., Akatsu M., Asano Y., Aulchenko V., Aushev T., Bahinipati S., Bakich A. M., Ban Y., Banerjee S., Bedny I., Bitenc U., Bizjak I., Blyth S., Bondar A., Bozek A., Bračko M., Brodzicka J., Browder T. E., Chao Y., Chen A., Chen K. F., Chen W. T., Cheon B. G., Chistov R., Choi S. K., Choi Y., Choi Y. K., Chuvikov A., Cole S., Dalseno J., Danilov M., Dash M., Dong L. Y., Drutskoy A., Eidelman S., Eiges V., Enari Y., Fratina S., Gabyshev N., Garmash A., Gershon T., Gokhroo G., Golob B., Haba J., Hayasaka K., Hayashii H., Hazumi M., Higuchi T., Hinz L., Hokuue T., Hoshi Y., Hou S., Hou W. S., Hsiung Y. B., Iijima T., Imoto A., Inami K., Ishikawa A., Itoh R., Iwasaki M., Iwasaki Y., Kang J. H., Kang J. S., Kapusta P., Katayama N., Kawai H., Kawasaki T., Kent N., Khan H. R., Kichimi H., Kim H. J., Kim S. K., Kim S. M., Kinoshita K., Koppenburg P., Korpar S., Križan P., Krokovny P., Kulasiri R., Kuo C. C., Kuzmin A., Kwon Y. J., Leder G., Lee S. E., Lesiak T., Li J., Lin S. W., Liventsev D., MacNaughton J., Majumder G., Mandl F., Marlow D.

We report a study of the suppressed decays B - → [K +π -] DK - and B - → [K +π -] Dπ -, where [K +π -] D indicates that the K +π - pair originates from a neutral D meson. These decay modes are sensitive to the unitarity triangle angle φ 3. We use a data sample containing 275 × 10 6 BB̄ pairs recorded at the Y(4S) resonance with the Belle detector at the KEKB asymmetric e +e - storage ring. The signal for B - → [K +π -] DK - is not statistically significant, and we set a limit r B < 0.27 at 90% confidence level, where r B is the magnitude of the ratio of amplitudes |A(B - → D̄ 0K -)/A(B - → D 0K -)|. We observe a signal with 6.4σ statistical significance in the related mode, B - → [K +π -] Dπ -. © 2005 The American Physical Society.