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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2011, vol. 106, p. -

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

Horii Y., Trabelsi K., Yamamoto H., Adachi I., Aihara H., Arinstein K., Aulchenko V., Aushev T., Balagura V., Barberio E., Belous K., Bhuyan B., Bischofberger M., Bozek A., Bračko M., Browder T. E., Chang M. C., Chang P., Chen A., Chen P., Cheon B. G., Chiang C. C., Cho I. S., Cho K., Choi Y., Doleal Z., Eidelman S., Feindt M., Gaur V., Gabyshev N., Garmash A., Golob B., Ha H., Haba J., Hayasaka K., 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., Kawasaki T., Kichimi H., Kiesling C., Kim H. J., Kim H. O., Kim M. J., Kim Y. J., Kinoshita K., Ko B. R., Kobayashi N., Korpar S., Krian P., Kuhr T., Kumar R., Kwon Y. J., Lee M. J., Lee S. H., Li J., Liu C., Liventsev D., Louvot R., Matyja A., McOnie S., Miyabayashi K., Miyata H., Miyazaki Y., Mohanty G. B., Moll A., Mori T., Muramatsu N., Nakano E., Nakazawa H., Natkaniec Z., Neubauer S., Nishida S., Nitoh O., Ohshima T., Okuno S., Onuki Y., Pakhlov P.

The suppressed decay chain B-→DK-, D→K +π-, where D indicates a D̄0 or D0 state, provides important information on the CP-violating angle ?3. We measure the ratio RDK of the decay rates to the favored mode B-→DK-, D→K-π+ to be RDK=[1.63-0.41+0.44(stat)-0.13+0.07(syst)]×10-2, which indicates the first evidence of the signal with a significance of 4.1σ. We also measure the asymmetry ADK between the charge-conjugate decays to be ADK=-0.39-0.28+0.26(stat)-0.03+0. 04(syst). The results are based on the full 772×106 BB̄ pair data sample collected at the Υ(4S) resonance with the Belle detector. © 2011 American Physical Society.