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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2007, vol. 75, p. -

Improved measurement of B̄0→Ds-D+ and search for B̄0→Ds+Ds- at Belle

Zupanc A., Abe K., Abe K., Aihara H., Anipko D., Arinstein K., Aulchenko V., Aushev T., Bahinipati S., Bakich A. M., Barberio E., Bitenc U., Bizjak I., Blyth S., Bondar A., Bozek A., Bračko M., Browder T. E., Chang M. C., Chang P., Chao Y., Chen K. F., Chen W. T., Cheon B. G., Chistov R., Choi S. K., Choi Y., Choi Y. K., Dalseno J., Dash M., Drutskoy A., Eidelman S., Fratina S., Gabyshev N., Go A., Golob B., Ha H., Haba J., Hara T., Hayashii H., Hazumi M., Heffernan D., Hokuue T., Hoshi Y., Hou W. S., Hsiung Y. B., Iijima T., Ikado K., Inami K., Ishikawa A., Ishino H., Itoh R., Iwasaki Y., Kaji H., Kapusta P., Kawai H., Kawasaki T., Kichimi H., Kim H. J., Kim Y. J., Kinoshita K., Korpar S., Križan P., Krokovny P., Kulasiri R., Kumar R., Kwon Y. J., Lee M. J., Lesiak T., Limosani A., Lin S. W., Liventsev D., Majumder G., Mandl F., Matsumoto T., McOnie S., Medvedeva T., Mitaroff W., Miyabayashi K., Miyake H., Miyata H., Miyazaki Y., Mizuk R., Moloney G. R., Nakano E., Nakao M., Nakazawa H., Natkaniec Z., Nishida S., Nitoh O., Ogawa S., Ohshima T., Okuno S., Onuki Y.

We reconstruct B̄0→Ds-D+ decays using a sample of 449×106 BB̄ pairs recorded by the Belle experiment, and measure the branching fraction to be B(B̄0→Ds-D+)=[7.5±0.2(stat)±0.8(syst) ±0.8(B′s)]×10-3. A search for the related decay B̄0→Ds+Ds- is also performed. Since we observe no statistically significant signal, an upper limit on the branching fraction is set at 3.6×10-5 (90% C.L.). © 2007 The American Physical Society.