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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2004, vol. 93, p. -

Study of time-dependent CP violation in B 0 → J/ Ψπ 0 decays 261801

Kataoka S. U., Abe K., Abe K., Adachi I., Aihara H., Akatsu M., Asano Y., Aushev T., Bahinipati S., Bakich A. M., Bay A., Bedny I., Bitenc U., Bizjak I., Bondar A., Bračko M., Chao Y., Chen A., Chen W. T., Cheon B. G., Chistov R., Choi Y., Danilov M., Dash M., Dong L. Y., Dragic J., Eidelman S., Eiges V., Enari Y., Fang F., Fratina S., Gabyshev N., Garmash A., Gershon T., Go A., Gokhroo G., Golob B., Haba J., Hara K., Hastings N. C., Hayasaka K., Hayashii H., Hazumi M., Higuchi T., Hinz L., Hokuue T., Hoshi Y., Hou S., Hou W. S., Hsiung Y. B., Iijima T., Imoto A., Inami K., Ishikawa A., Ishino H., Itoh R., Iwasaki M., Iwasaki Y., Kang J. H., Kang J. S., Kapusta P., Katayama N., Kawai H., Kawasaki T., Khan H. R., Kim H. J., Kinoshita K., Koppenburg P., Korpar S., Križan P., Krokovny P., Kuo C. C., Kuzmin A., Kwon Y. J., Lange J. S., Leder G., Lee S. E., Lee S. H., Lesiak T., Li J., Lin S. W., MacNaughton J., Mandl F., Matsumoto T., Mitaroff W., Miyabayashi K., Miyake H., Miyata H., Mohapatra D., Mori T., Nagamine T., Nagasaka Y., Nakano E., Nakazawa H., Natkaniec Z., Nishida S.

The CP asymmetry parameters in the decay B 0(B̄ 0) → J/ψπ 0, were described. The measurement of the CP asymmetry parameters was based on a 140 fb -1 data sample, which was accumulated at the γ(4S) resonance by the Belle detector at the KEKB asymmetric-energy e +e - collider. It was observed that one neutral B meson flavor was identified by its decay products. The results show values of the CP-violating parameters were found to be of the order of S J/ψπ o = -0.72∓0.42(stat)∓0.09(syst) and A J/ψπ 0 = -0.01∓0.29(stat)∓0. 03(syst).