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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2002, vol. 89, p. 231804/1-231804/6

Observation of Ds +K- and evidence for Ds + π- final states in neutral B decays

Krokovny P., Abe K., Abe K., Abe T., Adachi I., Ahn B. S., Aihara H., Akatsu M., Asano Y., Aso T., Aulchenko V., Aushev T., Bakich A. M., Ban Y., Banas E., 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., Chen K. F., Cheon B. G., Chistov R., Choi S. K., Choi Y., Danilov M., Dong L. Y., Drutskoy A., Eidelman S., Eiges V., Enari Y., Everton C. W., Fang F., Fukunaga C., Gabyshev N., Garmash A., Gershon T., Golob B., Gordon A., Guo R., Haba J., Hanagaki K., Handa F., Harada Y., Hayashii H., Hazumi M., Heenan E. M., Higuchi T., Hinz L., Hojo T., Hokuue T., Hoshi Y., Hou W. S., Huang H. C., Igaki T., Iijima T., Inami K., Ishikawa A., Ishino H., Itoh R., Iwasaki H., Jang H. K., Kaneko J., Kang J. H., Kang J. S., Katayama N., Kawai H., Kawakami Y., Kawamura N., Kawasaki T., Kichimi H., Kim D. W., Kim H., Kim H. J., Kim H. O., Kim H., Kim S. K., Kinoshita K., Kobayashi S., Korpar S., Križan P., Kulasiri R., Kumar S., Kuzmin A., Kwon Y. J., Lange J. S., Leder G., Lee S. H.

An overview is given on the first observation of a mode that is directly accessible through the spectator process. The mode ̄B0→Ds +K- may occur via W exchange or final rescattering, and predictions for its branching fraction vary over a wide range, 3X10-6-10-. The search for ̄B0→Ds +K- also encompasses B0→Ds +π-, a mode expected to be dominated by a (spectator) b→u transition.