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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2001, vol. 87, p. 101801/1-101801/5

Measurement of branching fractions for B → ππ, Kπ and KK decays

Abe K., Abe K., Adachi I., Ahn B. S., Aihara H., Akatsu M., Alimonti G., Asano Y., Aso T., Aulchenko V., Aushev T., Bakich A. M., Bartel W., Behari S., Behera P. K., Beiline D., Bondar A., Bozek A., Browder T. E., Casey B. C K, Chang P., Chao Y., Chen K. F., Cheon B. G., Choi S. K., Choi Y., Eidelman S., Enari Y., Enomoto R., Fang F., Fujii H., Fukushima M., Garmash A., Gordon A., Gotow K., Guo R., Haba J., Hamasaki H., Hanagaki K., Handa F., Hara K., Hara T., Hastings N. C., Hayashii H., Hazumi M., Heenan E. M., Higuchi I., Higuchi T., Hirano H., Hojo T., Hoshi Y., Hou W. S., Hsu S. C., Huang H. C., Igarashi Y., Iijima T., Ikeda H., Inami K., Ishikawa A., Ishino H., Itoh R., Iwai G., Iwasaki H., Iwasaki Y., Jackson D. J., Jalocha P., Jang H. K., Jones M., Kakuno H., Kaneko J., Kang J. H., Kang J. S., Katayama N., Kawai H., Kawai H., Kawasaki T., Kichimi H., Kim D. W., Kim H., Kim H. J., Kim H., Kim S. K., Kinoshita K., Kobayashi S., Krokovny P., Kulasiri R., Kumar S., Kuzmin A., Kwon Y. J., Lange J. S., Lee M. H., Lee S. H., Liventsev D., Lu R. S., Marlow D., Matsubara T., Matsumoto S.

Using BB events recorded in the Belle detector, the charge averaged branching fractions for B→π+π-, K+π-, K+π0, K0π0 were measured with statistically significant signals. The results confirm that B(B0→K+π-) is larger than B(B0→π+π-), and indicate that B(B+→h+π0) and B(B0→K0π0) seem to be larger than expected in relation to the B0→h+π- and B+→K0π+ modes based on isospin or penguin dominance arguments.