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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2007, vol. 99, p. -

Measurement of D0-D̄0 mixing parameters in D0→Ksπ+π- decays

Zhang L. M., Zhang Z. P., Adachi I., Aihara H., Aulchenko V., Aushev T., Bakich A. M., Balagura V., Barberio E., Bay A., Belous K., Bitenc U., Bondar A., Bozek A., Bračko M., Brodzicka J., Browder T. E., Chang P., Chao Y., Chen A., Chen K. F., Chen W. T., Cheon B. G., Chiang C. C., Cho I. S., Choi Y., Choi Y. K., Dalseno J., Danilov M., Dash M., Drutskoy A., Eidelman S., Epifanov D., Fratina S., Gabyshev N., Gokhroo G., Golob B., Ha H., Haba J., Hara T., Hastings N. C., Hayasaka K., Hayashii H., Hazumi M., Heffernan D., Hokuue T., Hoshi Y., Hou W. S., Hsiung Y. B., Hyun H. J., Iijima T., Ikado K., Inami K., Ishikawa A., Ishino H., Itoh R., Iwasaki M., Iwasaki Y., Joshi N. J., Kah D. H., Kaji H., Kajiwara S., Kang J. H., Kawai H., Kawasaki T., Kichimi H., Kim H. J., Kim H. O., Kim S. K., Kim Y. J., Kinoshita K., Korpar S., Križan P., Krokovny P., Kumar R., Kuo C. C., Kuzmin A., Kwon Y. J., Lee J. S., Lee M. J., Lee S. E., Lesiak T., Li J., Limosani A., Lin S. W., Liu Y., Liventsev D., Matsumoto T., Matyja A., McOnie S., Medvedeva T., Mitaroff W., Miyake H., Miyata H., Miyazaki Y.

We report a measurement of D0-D̄0 mixing parameters in D0→KS0π+π- decays using a time-dependent Dalitz-plot analysis. We first assume CP conservation and subsequently allow for CP violation. The results are based on 540fb-1 of data accumulated with the Belle detector at the KEKB e+e- collider. Assuming negligible CP violation, we measure the mixing parameters x=(0.80±0.29-0.07-0.14+0.09+0.10)% and y=(0.33±0.24-0. 12-0.08+0.08+0.06)%, where the errors are statistical, experimental systematic, and systematic due to the Dalitz decay model, respectively. Allowing for CP violation, we obtain the CP-violating parameters |q/p|=0.86-0.29-0.03+0.30+0. 06±0.08 and arg (q/p)=(-14-18-3-4+16+5+2)°. © 2007 The American Physical Society.