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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2011, vol. 107, p. -

Observation of D+→K+η(′ and search for CP violation in D+→π+η(′) decays

Won E., Ko B. R., Adachi I., Aihara H., Arinstein K., Asner D. M., Aushev T., Bakich A. M., Barberio E., Bay A., Bhardwaj V., Bhuyan B., Bischofberger M., Bondar A., Bozek A., Bračko M., Brodzicka J., Browder T. E., Chang P., Chen A., Chen P., Cheon B. G., Chilikin K., Cho I. S., Cho K., Choi S. K., Choi Y., Dalseno J., Danilov M., Doležal Z., Drásal Z., Drutskoy A., Eidelman S., Fast J. E., Gaur V., Gabyshev N., Garmash A., Goh Y. M., Golob B., Haba J., Hara T., Hayasaka K., Hayashii H., Horii Y., Hoshi Y., Hou W. S., Hsiung Y. B., Hyun H. J., Iijima T., Inami K., Ishikawa A., Itoh R., Iwabuchi M., Iwasaki Y., Iwashita T., Joshi N. J., Julius T., Kang J. H., Katayama N., Kawasaki T., Kichimi H., Kim H. J., Kim H. O., Kim J. B., Kim J. H., Kim K. T., Kim M. J., Kim S. K., Kim Y. J., Kinoshita K., Kobayashi N., Koblitz S., Kodyš P., Korpar S., Križan P., Kumita T., Kuzmin A., Kwon Y. J., Lange J. S., Lee M. J., Lee S. H., Li J., Li Y., Libby J., Lim C. L., Liu C., Liu Y., Liventsev D., Louvot R., McOnie S., Miyabayashi K., Miyata H., Miyazaki Y., Mizuk R.

We report the first observation of the doubly Cabibbo-suppressed decays D+→K+η(′) using a 791fb-1 data sample collected with the Belle detector at the KEKB asymmetric-energy e +e- collider. The ratio of the branching fractions of doubly Cabibbo-suppressed relative to singly Cabibbo-suppressed D +→π+η(′) decays are B(D +→K+η)/B(D+→π+η )=(3.06±0.43±0.14)% and B(D+→K+η ′)/B(D+→π+η ′)=(3.77±0.39±0.10)%. From these, we find that the relative final-state phase difference between the tree and annihilation amplitudes in D+ decays, δTA, is (72±9)°or (288±9)°. We also report the most precise measurements of CP asymmetries to date: ACPD+→π +η=(+1.74±1.13±0.19)% and ACPD+→ π+η′=(-0.12±1.12±0.17)%. © 2011 American Physical Society.