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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2013, vol. 88, p. -

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

Nayak M., Libby J., Trabelsi K., Adachi I., Aihara H., Asner D. M., Aushev T., Bakich A. M., Bala A., Behera P., Belous K., Bhardwaj V., Bonvicini G., Bozek A., Bračko M., Browder T. E., Červenkov D., Chang M. C., Chang P., Chekelian V., Chen A., Cheon B. G., Chistov R., Cho I. S., Cho K., Chobanova V., Choi Y., Cinabro D., Dalseno J., Danilov M., Doležal Z., Drásal Z., Dutta D., Eidelman S., Esen S., Farhat H., Fast J. E., Ferber T., Gaur V., Gabyshev N., Ganguly S., Gillard R., Goh Y. M., Golob B., Haba J., Hayashii H., Horii Y., Hoshi Y., Hou W. S., Hyun H. J., Iijima T., Ishikawa A., Iwashita T., Jaegle I., Julius T., Kah D. H., Kato E., Kim D. Y., Kim H. J., Kim J. B., Kim M. J., Kim Y. J., Kinoshita K., Klucar J., Ko B. R., Kodyš P., Korpar S., Krishnan P., Križan P., Krokovny P., Kuhr T., Kumita T., Kuzmin A., Kwon Y. J., Lee S. H., Li J., Li Y., Li Gioi L., Liu Y., Liventsev D., Lukin P., Miyake H., Mizuk R., Mohanty G. B., Moll A., Mori T., Muramatsu N., Mussa R., Nagasaka Y., Nakao M., Nedelkovska E.

We report a study of the suppressed decay B-→DK -, D→K+π-π0, where D denotes either a D0 or a D̄0 meson. The decay is sensitive to the CP -violating parameter 3. Using a data sample of 772×106 BB̄ pairs collected at the Υ(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-π+π0. Our result is RDK=[1.98±0.62(stat)±0.24(syst)] ×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 ADK=0.41±0.30(stat)±0.05(syst). We also report measurements for the analogous quantities RDπ and A Dπ for the decay B-→Dπ-, D→K+π-π0. © 2013 American Physical Society.