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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2002, vol. 546, p. 196-205

Measurement of CP-violating parameters in B → η′ K decays

Chen K. F., Hara K., Abe K., Abe K., Abe T., Adachi I., Byoung S. A., Aihara H., Akatsu M., Asano Y., Aso T., Aulchenko V., Aushev T., Bakich A. M., Ban Y., Bay A., Bedny I., Behera P. K., Bizjak I., Bondar A., Bozek A., Bračko M., Brodzicka J., Browder T. E., Casey B. C K, Chang P., Chao Y., Cheon B. G., Chistov R., Choi S. K., Choi Y., Choi Y. K., Danilov M., Dong L. Y., Dragic J., Eidelman S., Eiges V., Enari Y., Fang F., Fukunaga C., Gabyshev N., Garmash A., Gershon T., Golob B., Gordon A., Guo R., Haba J., Hanagaki K., Handa F., Hara T., Hastings N. C., Hayashii H., Hazumi M., Heenan E. M., Higuchi I., Higuchi T., Hinz L., Hoshi Y., Hou W. S., Hsiung Y. B., Hsu S. C., Huang H. C., Igaki T., Igarashi Y., Iijima T., Inami K., Ishikawa A., Itoh R., Iwasaki H., Iwasaki Y., Jang H. K., Kang J. H., Kang J. S., Katayama N., Kawai H., Kawakami Y., Kawamura N., Kichimi H., Kim D. W., Heejong K., Kim H. J., Hyunwoo K., Kim T. H., Kinoshita K., Korpar S., Križan P., Krokovny P., Kulasiri R., Kumar S., Kuzmin A., Kwon Y. J., Lange J. S., Leder G., Lee S. H.

We present measurements of CP-violating parameters in B0(B0) → η′ KS 0 and B± → η′ K± decays based on a 41.8 fb-1 data sample collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We fully reconstruct one neutral B meson as a B0(B0) → η′ KS 0 CP eigenstate and identify the flavor of the accompanying B from its decay products. From the distribution of proper time intervals between pairs of B meson decay points, we obtain the CP-violating asymmetry parameters Sη′ KS 0 = 0.28 ± 0.55(stat)-0.08 +0.07(syst), and Aη′ KS 0 = 0.13 ± 0.32(stat)-0.06 +0.09(syst). We also reconstruct charged B± → η′ K± decays and determine a direct-CP-violating asymmetry value of Aη′ K± = (-1.5 ± 7.0(stat) ± 0.9(syst))%. © 2002 Elsevier Science B.V. All rights reserved.