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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2005, vol. 94, p. -

Measurement of the time-dependent CP-violating asymmetry in BO→KSOπOγ decays

Ushiroda Y., Sumisawa K., Hazumi M., Abe K., Abe K., Adachi I., Aihara H., Asano Y., Aulchenko V., Aushev T., Bakich A. M., Bay A., Bedny I., Bitenc U., Bizjak I., Blyth S., Bondar A., Bozek A., Bračko M., Brodzicka J., Browder T. E., Chang M. C., Chang P., Chao Y., Chen A., Chen K. F., Chen W. T., Cheon B. G., Choi S. K., Choi Y., Chuvikov A., Cole S., Dalseno J., Danilov M., Dash M., Dragic J., Eidelman S., Fang F., Fratina S., Gabyshev N., Gershon T., Gokhroo G., Gorišek A., Haba J., Hara K., Hastings N. C., Hayasaka K., Hayashii H., Higuchi T., Hinz L., Hokuue T., Hoshi Y., Hou S., Hou W. S., Hsiung Y. B., Iijima T., Imoto A., Inami K., Ishikawa A., Ishino H., Itoh R., Iwasaki M., Iwasaki Y., Kang J. H., Kang J. S., Kapusta P., Katayama N., Kawai H., Kawasaki T., Khan H. R., Kichimi H., Kim H. J., Kim S. M., Kinoshita K., Križan P., Krokovny P., Kumar S., Kuo C. C., Kusaka A., Kuzmin A., Kwon Y. J., Leder G., Lesiak T., Li J., Limosani A., Lin S. W., Liventsev D., Mandl F., Matsumoto T., Mikami Y., Mitaroff W., Miyabayashi K., Miyake H., Miyata H., Mohapatra D., Moloney G. R.

We present a new measurement of CP-violation parameters in B0→KS0π0γ decay based on a sample of 275×106 BB̄ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB energy-asymmetric e+e- collider. One of the B mesons is fully reconstructed in the B0→KS0π0γ decay. The flavor of the accompanying B meson is identified from its decay products. CP-violation parameters are obtained from the asymmetry in the distribution of the proper time intervals between the two B decays. We obtain SKS0π0γ=-0.58-0.38+0.46(stat)±0.11(syst) and AKS0π0γ=+0.03±0.34(stat)±0.11(syst), for the KS0π0 invariant mass covering the full range up to 1.8GeV/c2. We also measure the CP-violation parameters for the case B0→K*0(→KS0π0)γ and obtain SK*0γ=-0.79-0.50+0.63(stat)±0.10(syst) for AK*0γ fixed at 0. © 2005 The American Physical Society.