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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2007, vol. 98, p. -

Observation of time-dependent CP violation in B0→η′K0 decays and improved measurements of CP asymmetries in B0→φK0, KS0KS0KS0 and B0→J/ψK0 decays

Chen K. F., Hara K., Hazumi M., Higuchi T., Miyabayashi K., Nakahama Y., Sumisawa K., Tajima O., Ushiroda Y., Yusa Y., Abe K., Abe K., Adachi I., Aihara H., Anipko D., Arinstein K., Aulchenko V., Aushev T., Aziz T., Bakich A. M., Balagura V., Banerjee S., Barberio E., Barbero M., Bay A., Belous K., Bitenc U., Bizjak I., Blyth S., Bondar A., Bozek A., Bračko M., Brodzicka J., Browder T. E., Chang P., Chao Y., Chen A., Chen W. T., Cheon B. G., Chistov R., Choi S. K., Choi Y., Choi Y. K., Chuvikov A., Cole S., Dalseno J., Danilov M., Dash M., Dragic J., Drutskoy A., Eidelman S., Epifanov D., Fratina S., Garmash A., Gershon T., Go A., Gokhroo G., Goldenzweig P., Golob B., Ha H., Haba J., Hara T., Hayasaka K., Hayashii H., Heffernan D., Hokuue T., Hoshi Y., Hou S., Hou W. S., Hsiung Y. B., Iijima T., Ikado K., Imoto A., Inami K., Ishikawa A., Ishino H., Itoh R., Iwasaki M., Iwasaki Y., Kakuno H., Kang J. H., Kataoka S. U., Katayama N., Kawai H., Kawasaki T., Khan H. R., Kichimi H., Kim H. J., Kim S. K., Kim Y. J., Kinoshita K., Korpar S., Križan P., Krokovny P.

We present improved measurements of CP-violation parameters in B0→K0, η′K0, KS0KS0KS0 decays based on a sample of 535×106 BB̄ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB energy-asymmetric e+e- collider. We obtain sin 2 1eff=+0.64±0.10(stat) ±0.04(syst) for B0→η′K0, +0.50±0.21(stat)±0. 06(syst) for B0→ K0, and +0.30±0.32(stat)±0.08(syst) for B0→KS0KS0KS0 decays. We have observed CP violation in the B0→η′K0 decay with a significance of 5.6 standard deviations. We also perform an improved measurement of CP asymmetries in B0→J/ψK0 decays and obtain sin 2 1=+0.642±0.031(stat)±0.017(syst). © 2007 The American Physical Society.