Вы находитесь на старом сайте НГУ. Перейти на новый сайт

ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2010, vol. 81, p. -

Evidence for direct CP violation in the decay B±→ D(*)K±, D→KS0π+π - and measurement of the CKM phase φ3

Poluektov A., Bondar A., Yabsley B. D., Adachi I., Aihara H., Arinstein K., Aulchenko V., Aushev T., Bakich A. M., Balagura V., Barberio E., Bay A., Belous K., Bischofberger M., Bozek A., Bračko M., Browder T. E., Chang M. C., Chang P., Chen A., Chen K. F., Chen P., Cheon B. G., Cho I. S., Choi Y., Dalseno J., Danilov M., Dash M., Drutskoy A., Dungel W., Eidelman S., Epifanov D., Gabyshev N., Garmash A., Goldenzweig P., Golob B., Ha H., Haba J., Hayashii H., Horii Y., Hoshi Y., Hou W. S., Hsiung Y. B., Hyun H. J., Iijima T., Inami K., Iwabuchi M., Iwasaki M., Iwasaki Y., Joshi N. J., Julius T., Kah D. H., Kang J. H., Kapusta P., Katayama N., Kawasaki T., Kiesling C., Kim H. J., Kim H. O., Kim J. H., Kim M. J., Kim Y. J., Kinoshita K., Ko B. R., Kodyš P., Korpar S., Križan P., Krokovny P., Kuhr T., Kumar R., Kuzmin A., Kwon Y. J., Kyeong S. H., Lange J. S., Lee M. J., Lee S. H., Li J., Liu C., Liventsev D., Louvot R., Matyja A., McOnie S., Miyabayashi K., Miyata H., Miyazaki Y.

We present a new measurement of the unitarity triangle angle φ3 using a Dalitz plot analysis of the KS0π+π- decay of the neutral D meson produced in B±→D(*) K± decays. The method exploits the interference between D0 and D̄0 to extract the angle φ3, strong phase δ, and the ratio r of suppressed and allowed amplitudes. We apply this method to a 605fb-1 data sample collected by the Belle experiment. The analysis uses three decays: B±→DK±, and B ±→D*K± with D *→Dπ0 and D*→Dγ, as well as the corresponding charge-conjugate modes. From a combined maximum likelihood fit to the three modes, we obtain φ3=78.4°+10.8°-11. 6°±3.6°(syst)±8.9°(model). CP conservation in this process is ruled out at the confidence level (1-CL)=5×10-4, or 3.5 standard deviations. © 2010 The American Physical Society.