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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2009, vol. 102, p. -

Measurement of the decay Bs0→Ds-π+ and evidence for Bs0→Ds K± in e+e- annihilation at s 10.87GeV

Louvot R., Wicht J., Schneider O., Adachi I., Aihara H., Arinstein K., Aulchenko V., Aushev T., Bakich A. M., Balagura V., Bay A., Bhardwaj V., Bitenc U., Bondar A., Bozek A., Bračko M., Browder T. E., Chen A., Cheon B. G., Chistov R., Cho I. S., Choi Y., Dalseno J., Danilov M., Dash M., Drutskoy A., Dungel W., Eidelman S., Gabyshev N., Goldenzweig P., Golob B., Ha H., Haba J., Hayasaka K., Hayashii H., Hazumi M., Hoshi Y., Hou W. S., Hyun H. J., Iijima T., Inami K., Ishikawa A., Ishino H., Itoh R., Iwasaki M., Joshi N. J., Kah D. H., Kang J. H., Katayama N., Kawai H., Kawasaki T., Kichimi H., Kim S. K., Kim Y. I., Kim Y. J., Kinoshita K., Korpar S., Krian P., Krokovny P., Kumar R., Kuzmin A., Kwon Y. J., Kyeong S. H., Lange J. S., Lee J. S., Lee M. J., Lee S. E., Lesiak T., Li J., Limosani A., Lin S. W., Liventsev D., Mandl F., Matyja A., McOnie S., Medvedeva T., Miyabayashi K., Miyake H., Miyata H., Miyazaki Y., Mizuk R., Mori T., Nakano E., Nakao M., Nishida S., Nitoh O., Ogawa S., Ohshima T., Okuno S., Ozaki H., Pakhlova G., Park C. W., Park H. K.

We have studied Bs0→Ds-π+ and Bs0→Ds K± decays using 23.6fb-1 of data collected at the Υ(5S) resonance with the Belle detector at the KEKB e+e- collider. This highly pure Bs0→Ds-π+ sample is used to measure the branching fraction, B(Bs0→Ds-π+)=[3.67-0.33+0.35(stat)-0. 42+0.43(syst)±0.49(fs)]×10-3 (fs=NBs(*)B̄s(*)/ Nbb̄) and the fractions of Bs0 event types at the Υ(5S) energy, in particular NBs*B̄s*/NBs(*)B̄s(*)=(90.1-4.0+3. 8±0.2)%. We also determine the masses M(Bs0)=(5364.4±1.3±0. 7)MeV/c2 and M(Bs*)=(5416.4±0.4±0.5)MeV/c2. In addition, we observe Bs0→Ds K± decays with a significance of 3.5σ and measure B(Bs0→Ds K±)=[2.4-1.0+1.2(stat)±0.3(syst)±0. 3(fs)]×10-4. © 2009 The American Physical Society.