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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2010, vol. 82, p. -

Measurement of CP violating asymmetries in B0→K+K -KS0 decays with a time-dependent Dalitz approach

Nakahama Y., Sumisawa K., Aihara H., Arinstein K., Aushev T., Aziz T., Bakich A. M., Balagura V., Belous K., Bhardwaj V., Bischofberger M., Bondar A., Bonvicini G., Bozek A., Bračko M., Browder T. E., Chang P., Chao Y., Chen A., Chen P., Cheon B. G., Chiang C. C., Cho I. S., Choi Y., Dalseno J., Das A., Doležal Z., Drásal Z., Drutskoy A., Eidelman S., Goldenzweig P., Golob B., Haba J., Hara K., Hayasaka K., Hazumi M., Higuchi T., Horii Y., Hoshi Y., Hou W. S., Hsiung Y. B., Hyun H. J., Iijima T., Inami K., Itoh R., Iwabuchi M., Iwasaki M., Iwasaki Y., Julius T., Kang J. H., Kapusta P., Katayama N., Kawai H., Kawasaki T., Kichimi H., Kim H. J., Kim J. H., Kim M. J., Ko B. R., Kodyš P., Korpar S., Križan P., Krokovny P., Kuhr T., Kumita T., Kyeong S. H., Lee M. J., Lee S. H., Liu Y., Louvot R., Matyja A., McOnie S., Miyabayashi K., Miyata H., Miyazaki Y., Mohanty G. B., Nakano E., Nakao M., Nakazawa H., Neubauer S., Nishida S., Nishimura K., Nitoh O., Nozaki T., Ogawa S., Ohshima T., Olsen S. L., Ostrowicz W., Ozaki H., Park C. W.

We report a measurement of CP violating asymmetries in B0(B ̄0)→K+K-KS0 decays with a time-dependent Dalitz approach. This analysis is based on a data sample of 657×106 BB̄ pairs accumulated at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. As the result of an unbinned maximum likelihood fit to the selected candidates, the mixing-induced and direct CP violation parameters φ 1eff and ACP are obtained for B0→φ(1020)KS0, B0→f 0(980)KS0, and other B0→K+K-KS0 decays. We find four solutions that describe the data. There are φ1eff(B0→φ (1020)KS0)=(32.2±9.0±2.6±1.4)°;φ1eff(B0→φ (1020)KS0)=(26.2±8.8±2.7±1.2)°;φ1eff(B0→φ (1020)KS0)=(27.3±8.6±2.8±1.3)°;andφ1eff(B0→ φ(1020)KS0)=(24.3±8.0±2.9±5.2)°. The values for the CP violating phase in B0→φ(1020)KS0 are similar, but other properties of the Dalitz plot are quite different for the four solutions. These four solutions have consistent φ1eff values for all three B-meson decay channels and none of them deviates significantly from the values measured in B→(cc̄)K0 decays with the currently available statistics. In addition, we find no significant direct CP violation. © 2010 The American Physical Society.