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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2009, vol. 102, p. -

Observation of the doubly cabibbo-suppressed decay Ds+→K+K+π-

Ko B. R., Won E., Aihara H., Arinstein K., Aushev T., Bakich A. M., Balagura V., Barberio E., Bondar A., Bozek A., Bračko M., Brodzicka J., Browder T. E., Chen A., Cheon B. G., Cho I. S., Choi Y., Drutskoy A., Dungel W., Eidelman S., Gabyshev N., Goldenzweig P., Golob B., Ha H., Haba J., Han B. Y., Hayasaka K., Hayashii H., Hoshi Y., Hou W. S., Hyun H. J., Itoh R., Iwasaki M., Kah D. H., Kang J. H., Kapusta P., Kawasaki T., Kichimi H., Kim H. J., Kim H. O., Kim S. K., Kim Y. I., Kim Y. J., Kinoshita K., Korpar S., Krokovny P., Kuzmin A., Kwon Y. J., Kyeong S. H., Lee M. J., Lee S. E., Lesiak T., Li J., Limosani A., Liu C., Liu Y., Liventsev D., Louvot R., MacNaughton J., Mandl F., McOnie S., Medvedeva T., Miyata H., Miyazaki Y., Nakano E., Nakao M., Natkaniec Z., Nishida S., Nishimura K., Nitoh O., Ogawa S., Ohshima T., Okuno S., Ozaki H., Pakhlov P., Pakhlova G., Palka H., Park C. W., Park H., Park H. K., Park K. S., Pestotnik R., Piilonen L. E., Sahoo H., Sakai K., Sakai Y., Schneider O., Schwanda C., Sekiya A., Senyo K.

We report the first observation of the doubly Cabibbo-suppressed decay Ds+→K+K+π- using 605fb-1 of data collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. The branching ratio with respect to its Cabibbo-favored counterpart B(Ds+→K+K+π-)/B(Ds+→K+K-π+) is (0.229±0.028±0.012)%, where the first uncertainty is statistical and the second is systematic. We also report a significantly improved measurement of the doubly Cabibbo-suppressed decay D+→K+π+π-, with a branching ratio B(D+→K+π+π-)/B(D+→K-π+π+)=(0.569±0. 018±0.014)%. © 2009 The American Physical Society.