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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2001, vol. 517, p. 309-318

Measurement of the branching fraction for B → η′ K and search for B → η′π+

Abe K., Abe K., Abe R., Adachi I., Ahn B. S., Aihara H., Akatsu M., Asano Y., Aso T., Aulchenko V., Bakich A. M., Banas E., Behari S., Behera P. K., Beiline D., Bondar A., Bozek A., Browder T. E., Casey B. C K, Chang P., Chao Y., Cheon B. G., Chistov R., Choi S. K., Choi Y., Dong L. Y., Dragic J., Eidelman S., Enari Y., Fang F., Fujii H., Fukunaga C., Fukushima M., Gabyshev N., Garmash A., Gershon T., Gordon A., Gotow K., Guo R., Haba J., Hamasaki H., Hara K., Hara T., Hastings N. C., Hayashii H., Hazumi M., Heenan E. M., Higuchi I., Higuchi T., Hirano H., Hojo T., Hoshi Y., Hoshina K., Hou S. R., 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., Kaneko J., Kang J. H., Kang J. S., Katayama N., Kawai H., Kawai H., Kawamura N., Kawasaki T., Kichimi H., Kim D. W., Kim H., Kim H. J., Kim H., Kim S. K., Kim T. H., Kinoshita K., Kobayashi S., Konishi H., Krokovny P., Kulasiri R., Kumar S., Kuzmin A., Kwon Y. J., Lange J. S., Leder G., Lee S. H., Liventsev D., Lu R. S., Matsubara T.

We report measurements for two-body charmless hadronic B decays with an η′ meson in the final state. Using 11.1 × 106 BB̄ pairs collected with the Belle detector, we find BF(B+ → η′K+) = (79+12 -11 ± 9) × 10-6 and BF(B0 → η′ K0) = (55+19 -16 ± 8) × 10-6, where the first and second errors are statistical and systematic, respectively. No signal is observed in the mode B+ → η′+, and we set a 90% confidence level upper limit of BF(B+ η′π+) < 7 × 10-6. The CP asymmetry in B± → η′K± decays is investigated and a limit at 90% confidence level of -0.20 < ACP < 0.32 is obtained. © 2001 Elsevier Science B.V. All rights reserved.