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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2009, vol. 80, p. -

Evidence of time-dependent CP violation in the decay B0→D*+D *-

Vervink K., Aushev T., Schneider O., Arinstein K., Bakich A. M., Balagura V., Barberio E., Bay A., Bhardwaj V., Bitenc U., Bondar A., Bozek A., Bračko M., Brodzicka J., Browder T. E., Chao Y., Chen A., Cheon B. G., Chiang C. C., Chistov R., Cho I. S., Choi Y., Dalseno J., Danilov M., Dungel W., Eidelman S., Fratina S., Gabyshev N., Goldenzweig P., Golob B., Ha H., Hara T., Hayasaka K., Hayashii H., Hazumi M., Heffernan D., Hoshi Y., Hou W. S., Hyun H. J., Inami K., Ishikawa A., Ishino H., Iwasaki Y., Kah D. H., Kang J. H., Katayama N., Kawai H., Kawasaki T., Kichimi H., Kim H. J., Kim H. O., Kim Y. I., Kim Y. J., Kinoshita K., Ko B. R., Korpar S., Križan P., Krokovny P., Kuzmin A., Kwon Y. J., Kyeong S. H., Lee J. S., Lee M. J., Li J., Limosani A., Liu C., Liu Y., Liventsev D., Louvot R., Matyja A., McOnie S., Miyabayashi K., Miyata H., Miyazaki Y., Mizuk R., Nakao M., Nakazawa H., Natkaniec Z., Nishida S., Nishimura K., Nitoh O., Ohshima T., Okuno S., Ozaki H., Pakhlov P., Pakhlova G., Park C. W., Park H., Park H. K., Pestotnik R., Piilonen L. E., Poluektov A., Sahoo H., Sakai Y.

We report a measurement of the CP-odd fraction and the time-dependent CP violation in B0→D*+D*- decays, using 657×106 BB̄ events collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We measure a CP-odd fraction of R=0.125±0.043(stat)±0.023(syst). From the distributions of the proper-time intervals between a B0→D*+D*- decay and the other B meson in the event, we obtain evidence of CP violation with measured parameters AD*+D*-=0.15±0.13(stat)±0.04(syst) and SD*+D*-=-0.96±0.25(stat)-0.16+0.13(syst). © 2009 The American Physical Society.