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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2015, vol. 91, 3, p. -

Measurement of B0 → D- s K0 S π+ and B+ → D- sK+K+ branching fractions

Wiechczynski J., Stypula J., Abdesselam A., Adachi I., Adamczyk K., Aihara H., Al Said S., Arinstein K., Asner D. M., Aulchenko V., Aushev T., Ayad R., Bakich A. M., Bansal V., Bhardwaj V., Bhuyan B., Bobrov A., Bondar A., Bonvicini G., Bozek A., Bračko M., Browder T. E., Èervenkov D., Chekelian V., Cheon B. G., Cho K., Chobanova V., Choi S. K., Choi Y., Cinabro D., Dalseno J., Danilov M., Dingfelder J., Doleəal Z., Drásal Z., Drutskoy A., Eidelman S., Farhat H., Fast J. E., Ferber T., Frost O., Gaur V., Gabyshev N., Ganguly S., Garmash A., Getzkow D., Gillard R., Goh Y. M., Grzymkowska O., Haba J., Hara T., Hayasaka K., Hayashii H., He X. H., Hou W. S., Huschle M., Hyun H. J., Iijima T., Ishikawa A., Itoh R., Iwasaki Y., Jaegle I., Joffe D., Joo K. K., Julius T., Kang K. H., Kato E., Kawasaki T., Kichimi H., Kim D. Y., Kim J. B., Kim J. H., Kim M. J., Kim S. H., Kim Y. J., Kinoshita K., Ko B. R., Kodyš P., Kriəan P., Krokovny P., Kuhr T., Kumita T., Kuzmin A., Kwon Y. J., Lange J. S., Lee I. S., Li Y., Li Gioi L., Libby J.

© 2015 American Physical Society. We report a measurement of the B0 and B+ meson decays to the D- sK0 Sπ+ and D- sK+K+ final states, respectively, using 657 × 106BB¯ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e+ collider. Using the D- s → φ π-, K∗(892)0K- and K0 SK- decay modes for the Ds reconstruction, we measure the following branching fractions: B(B0 → D- sK0 sπ+) = [0.47 ± 0.06(stat) ± 0.05(syst)] × 10-4 and B(B+ → D- sK+K+) = [0.93 ± 0.22(stat) ± 0.10(syst)] × 10-5. We find the ratio of the branching fraction of B+ → D- sK+K+ to that of the analogous Cabibbo-favored B+ → D- sK+π+ decay to be RB = 0.054 ± 0.013(stat) ± 0.006(syst), which is consistent with the naive factorization model. We also observe a deviation of the DsK invariant-mass distribution from the three-body phase-space model for both studied decays.