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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2008, vol. 77, p. -

Improved measurement of time-dependent CP violation in B0→J/ψπ0 decays

Lee S. E., Miyabayashi K., Aihara H., Aushev T., Aziz T., Bakich A. M., Balagura V., Barberio E., Bay A., Belous K., Bhardwaj V., Bitenc U., Blyth S., Bondar A., Bozek A., Bračko M., Browder T. E., Chang P., Chen A., Chen K. F., Cheon B. G., Chistov R., Cho I. S., Choi S. K., Choi Y., Dalseno J., Dash M., Eidelman S., Epifanov D., Gabyshev N., Ha H., Haba J., Hara K., Hara T., Hayashii H., Hazumi M., Heffernan D., Higuchi T., Hoshi Y., Hou W. S., Hyun H. J., Iijima T., Inami K., Ishikawa A., Ishino H., Itoh R., Iwasaki M., Kah D. H., Kang J. H., Kataoka S. U., Kawai H., Kawasaki T., Kim H. J., Kim S. K., Kim Y. J., Kinoshita K., Korpar S., Križan P., Kumar R., Kuo C. C., Kuzmin A., Kwon Y. J., Lee J. S., Lee M. J., Lesiak T., Lin S. W., Liu Y., Liventsev D., McOnie S., Medvedeva T., Mitaroff W., Miyata H., Mizuk R., Mori T., Nakano E., Nakao M., Nakazawa H., Natkaniec Z., Nishida S., Nitoh O., Noguchi S., Nozaki T., Ogawa S., Ohshima T., Okuno S., Olsen S. L., Ozaki H., Pakhlov P., Pakhlova G., Park H., Park K. S., Pestotnik R., Piilonen L. E., Sahoo H., Sakai Y.

We report improved measurements of time-dependent CP violation parameters for B0(B̄0)→J/ψπ0 decay. This analysis is based on 535×106 BB̄ pairs accumulated at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. From the distribution of proper time intervals between the two B decays, we obtain the following CP violation parameters SJ/ψπ0=-0.65±0.21(stat) ±0.05(syst)andAJ/ψπ0=+0.08±0.16(stat)±0.05(syst), which are consistent with standard model expectations. © 2008 The American Physical Society.