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

Evidence for B→Kη′γ decays at Belle

Wedd R., Adachi I., Aihara H., Arinstein K., Aulchenko V., Bakich A. M., Balagura V., Barberio E., Bay A., Belous K., Bhardwaj V., Bischofberger M., Bondar A., Bozek A., Bračko M., Browder T. E., Chao Y., Chen A., Cheon B. G., Cho I. S., Choi Y., Dalseno J., Dash M., Drutskoy A., Eidelman S., Epifanov D., Gabyshev N., Goldenzweig P., Ha H., Horii Y., Hoshi Y., Hou W. S., Hyun H. J., Iijima T., Inami K., Ishikawa A., Itoh R., Iwasaki M., Kah D. H., Katayama N., Kawai H., Kawasaki T., Kim H. O., Kim J. H., Kim Y. I., Kim Y. J., Kinoshita K., Ko B. R., Križan P., Krokovny P., Kuhr T., Kumar R., Kuzmin A., Kwon Y. J., Kyeong S. H., Lee M. J., Lee S. H., Lesiak T., Li J., Limosani A., Liu C., Liventsev D., Louvot R., Matyja A., McOnie S., Miyata H., Mizuk R., Mori T., Nagasaka Y., Nakao M., Nakazawa H., Natkaniec Z., Nishida S., Nitoh O., Ohshima T., Okuno S., Ozaki H., Pakhlov P., Pakhlova G., Park C. W., Park H. K., Park K. S., Pestotnik R., Piilonen L. E., Poluektov A., Sahoo H., Sakai Y., Schneider O., Schümann J.

We present the results of a search for the radiative decay B→Kη′γ and find evidence for B +→K+η′γ decays at the 3.3 standard deviation level with a partial branching fraction of (3.6±1.2±0.4)×10-6, where the first error is statistical and the second systematic. This measurement is restricted to the region of combined Kη′ invariant mass less than 3.4GeV/c2. A 90% confidence level upper limit of 6.4×10-6 is obtained for the partial branching fraction of the decay B0→K0η ′γ in the same Kη′ invariant mass region. These results are obtained from a 605fb-1 data sample containing 657×106BB̄ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. © 2010 The American Physical Society.