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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2008, vol. 78, p. -

Study of the suppressed B meson decay B-→DK-, D→K+π-

Horii Y., Trabelsi K., Yamamoto H., Adachi I., Aihara H., Arinstein K., Aulchenko V., Balagura V., Barberio E., Bedny I., Belous K., Bhardwaj V., Bitenc U., Blyth S., Bozek A., Bračko M., Browder T. E., Chao Y., Chen A., Chen W. T., Cheon B. G., Chistov R., Cho I. S., Choi S. K., Choi Y., Dalseno J., Dash M., Eidelman S., Gabyshev N., Ha H., Haba J., Hara T., Hayasaka K., Hazumi M., Heffernan D., Hoshi Y., Hou W. S., Hyun H. J., Inami K., Ishikawa A., Ishino H., Itoh R., Iwabuchi M., Iwasaki M., Iwasaki Y., Kah D. H., Kaji H., Kang J. H., Katayama N., Kawai H., Kawasaki T., Kichimi H., Kim H. J., Kim S. K., Kim Y. J., Kinoshita K., Korpar S., Križan P., Krokovny P., Kuo C. C., Kuroki Y., Kuzmin A., Kwon Y. J., Lee J. S., Lee M. J., Lee S. E., Lesiak T., Li J., Lin S. W., Liu C., Liventsev D., Mandl F., McOnie S., Medvedeva T., Mitaroff W., Miyabayashi K., Miyake H., Miyata H., Miyazaki Y., Mizuk R., Moloney G. R., Nagamine T., Nagasaka Y., Nakao M., Nakazawa H., Natkaniec Z., Nishida S., Nitoh O., Ogawa S., Ohshima T., Okuno S., Ozaki H., Pakhlova G., Park C. W., Park H., Park H. K., Peak L. S.

We report a study of the suppressed B meson decay B-→DK- followed by D→K+π-, where D indicates a D0 or D̄0 state. The two decay paths interfere and provide information on the CP-violating angle 3. We use a data sample containing 657×106 BB̄ pairs recorded at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- storage ring. We do not find significant evidence for the mode B-→DK-, D→K+π-, and set an upper limit of rB<0.19, where rB is the magnitude of the ratio of amplitudes |A(B-→D̄0K-)/A(B-→D0K-)|. The decay B-→Dπ-, D→K+π- is also analyzed as a reference, for which we observe a signal with 6.6σ significance, and measure the charge asymmetry ADπ to be -0.02-0.16+0.15(stat)±0.04(syst). In addition, the ratio B(B-→D0K-)/B(B-→D0π-) is measured to be [6.77±0.23(stat) ±0.30(syst)]×10-2. © 2008 The American Physical Society.