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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2003, vol. 91, p. 2618011-2618015

Evidence for B0 → π0π0

Lee S. H., Suzuki K., Abe K., Abe K., Abe T., Adachi I., Ahn Byoung Sup, Aihara H., Akai K., Akatsu M., Akemoto M., Asano Y., Aulchenko V., Aushev T., Bakich A. M., Ban Y., Banerjee S., Bay A., Bedny I., Bizjak I., Bondar A., Bozek A., Bračko M., Browder T. E., Chang P., Chao Y., Chen K. F., Cheon B. G., Chistov R., Choi S. K., Choi Y., Chuvikov A., Danilov M., Dong L. Y., Dragic J., Drutskoy A., Eidelman S., Eiges V., Enari Y., Flanagan J., Fukunaga C., Furukawa K., Gabyshev N., Garmash A., Gershon T., Golob B., Guo R., Haba J., Hagner C., Handa F., Hastings N. C., Hayashii H., Hazumi M., Higuchi I., Hokuue T., Hoshi Y., Hou W. S., Huang H. C., Igarashi Y., Iijima T., Ikeda H., Inami K., Ishikawa A., Itoh R., Iwasaki H., Iwasaki M., Iwasaki Y., Kakuno H., Kang J. H., Kang J. S., Kapusta P., Kataoka S. U., Katayama N., Kawai H., Kawai H., Kawasaki T., Kichimi H., Kikutani E., Kim H. J., Kim Hyunwoo, Kim J. H., Kim S. K., Kinoshita K., Koiso H., Korpar S., Križan P., Krokovny P., Kulasiri R., Kuzmin A., Kwon Y. J., Lange J. S., Leder G., Lesiak T., Li J.

The decay B0 → π0π0 was investigated. The analysis was based on the data sample collected with a Belle detector. It was assumed that neutral and charged B mesons are produced in equal amounts. A signal with a significance of 3.4 standard deviations was detected. The branching factor was also obtained by dividing the signal yield by reconstruction efficiency.