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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2010, vol. 82, p. -

Measurements of branching fractions for B0→Ds+π- and B̄0→Ds+K-

Das A., Aziz T., Trabelsi K., Mohanty G. B., Adachi I., Aihara H., Arinstein K., Aulchenko V., Aushev T., Bakich A. M., Balagura V., Barberio E., Belous K., Bhardwaj V., Bhuyan B., Bischofberger M., Bondar A., Bozek A., Bračko M., Browder T. E., Chao Y., Chen A., Chen K. F., Chen P., Cheon B. G., Chiang C. C., Cho I. S., Choi Y., Dalseno J., Danilov M., Doležal Z., Drásal Z., Drutskoy A., Dungel W., Eidelman S., Esen S., Gabyshev N., Ha H., Hayasaka K., Hayashii H., Horii Y., Hoshi Y., Hou W. S., Hyun H. J., Iijima T., Inami K., Itoh R., Iwabuchi M., Iwasaki Y., Joshi N. J., Julius T., Kah D. H., Kang J. H., Kapusta P., Kawai H., Kawasaki T., Kichimi H., Kiesling C., Kim H. J., Kim H. O., Kim J. H., Kim M. J., Kim Y. J., Kinoshita K., Ko B. R., Kodyš P., Korpar S., Križan P., Krokovny P., Kuhr T., Kumar R., Kumita T., Kwon Y. J., Kyeong S. H., Lange J. S., Lee M. J., Lee S. H., Li J., Liu C., Liu Y., Liventsev D., Louvot R., MacNaughton J., Matyja A., McOnie S., Miyabayashi K., Miyata H., Miyazaki Y., Mori T., Nakano E.

We present improved measurements of the branching fractions for the decays B0→Ds+π- and B̄0→Ds+K- using a data sample of 657×106 BB̄ events collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e +e- collider. The results are B(B0→Ds+π -)=(1.99±0.26±0.18)×10-5 and B(B ̄0→Ds+K-)=(1.91±0.24±0.17) ×10-5, where the uncertainties are statistical and systematic, respectively. Based on these results, we determine the ratio between amplitudes of the doubly Cabibbo suppressed decay B0→D+π- and the Cabibbo favored decay B0→D-π+, R Dπ=[1.71±0.11(stat)±0.09(syst)±0.02(theo)]%, where the last term denotes the theory error. © 2010 The American Physical Society.