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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2010, vol. 81, p. -

Measurement of CP asymmetries in B0→K0π0 decays

Fujikawa M., Yusa Y., Dalseno J., Hazumi M., Sumisawa K., Aihara H., Arinstein K., Aulchenko V., Aushev T., Aziz T., Bakich A. M., Balagura V., Barberio E., Belous K., Bhardwaj V., Bischofberger M., Bondar A., Bozek A., Bračko M., Browder T. E., Chao Y., Chen A., Cheon B. G., Choi S. K., Choi Y., Dungel W., Eidelman S., Feindt M., Goldenzweig P., Ha H., Haba J., Han B. Y., Hara K., Hasegawa Y., Hayasaka K., Hayashii H., Horii Y., Hoshi Y., Hou W. S., Hyun H. J., Iijima T., Inami K., Ishino H., Itoh R., Iwasaki M., Iwasaki Y., Julius T., Kang J. H., Kawai H., Kiesling C., Kim H. O., Kim S. K., Kim Y. I., Kim Y. J., Kinoshita K., Ko B. R., Korpar S., Kreps M., Krokovny P., Kuhr T., Kumar R., Kumita T., Kwon Y. J., Kyeong S. H., Lee S. H., Li J., Liu C., Liventsev D., Louvot R., McOnie S., Miyabayashi K., Miyata H., Miyazaki Y., Mori T., Nagasaka Y., Nakano E., Nakao M., Nishida S., Nishimura K., Nitoh O., Nozaki T., Ohshima T., Okuno S., Olsen S. L., Ozaki H., Pakhlov P., Pakhlova G., Park C. W., Park H., Park H. K., Pestotnik R.

We report measurements of CP violation parameters in B0→K0π0 decays based on a data sample of 657×106BB̄ pairs collected with the Belle detector at the KEKB e+e- asymmetric-energy collider. We use B0→KS0π0 decays for both mixing-induced and direct CP violating asymmetry measurements and B0→KL0π0 decays for the direct CP violation measurement. The CP violation parameters obtained are sin 2 1eff=+0.67±0. 31(stat)±0.08(syst) and AK0π0=+0.14±0.13(stat)±0. 06(syst). The branching fraction of B0→K0π0 decay is measured to be B(B0→K0π0)=(8.7±0.5(stat.)±0.6(syst.))×10 -6. The observed AK0π0 value differs by 1.9 standard deviations from the value expected from an isospin sum rule. © 2010 The American Physical Society.