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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2015, vol. 92, 7, p. -

Semi-inclusive studies of semileptonic Bs decays at Belle

Oswald C., Urquijo P., Dingfelder J., Abdesselam A., Adachi I., Aihara H., Al Said S., Asner D. M., Aushev T., Ayad R., Babu V., Badhrees I., Bakich A. M., Bhardwaj V., Bobrov A., Bonvicini G., Bozek A., Bračko M., Browder T. E., Červenkov D., Chang M. C., Chekelian V., Chen A., Cheon B. G., Chilikin K., Cho K., Chobanova V., Choi Y., Cinabro D., Dalseno J., DoleŽal Z., Drásal Z., Drutskoy A., Dutta D., Eidelman S., Farhat H., Fast J. E., Ferber T., Frost O., Fulsom B. G., Gaur V., Gabyshev N., Ganguly S., Garmash A., Getzkow D., Gillard R., Glattauer R., Goh Y. M., Goldenzweig P., Golob B., Grzymkowska O., Hara T., Hasenbusch J., 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., Julius T., Kang K. H., Kapusta P., Kato E., Kawasaki T., Kiesling C., Kim D. Y., Kim J. B., Kim J. H., Kim K. T., Kim M. J., Kim S. H., Kim Y. J., Kinoshita K., Ko B. R., Kodyš P., Korpar S., KriŽan P., Krokovny P., Kuhr T., Kumita T., Kwon Y. J., Lange J. S.

© 2015 American Physical Society. We present an analysis of the semi-inclusive decays Bs→Ds-Xℓ+ν and Bs→Ds∗-Xℓ+ν, where X denotes a final state that may consist of additional hadrons or photons and ℓ is an electron or muon. The studied Bs decays are contained in the 121.4fb-1 Υ(5S) data sample collected by the Belle detector at the KEKB asymmetric-energy e+e- collider. The branching fractions of the decays are measured to be B(Bs→Ds-Xℓ+ν)=[8.2±0.2(stat)±0.6(syst)±1.4(ext)]% and B(Bs→Ds∗-Xℓ+ν)=[5.4±0.4(stat)±0.4(syst)±0.9(ext)]%, where the first two uncertainties are statistical and systematic and the last is due to external parameters. The measurement also provides an estimate of the Bs(∗)B¯s(∗) production cross section, σ(e+e-→Bs(∗)B¯s(∗))=[53.8±1.4(stat)±4.0(syst)±3.4(ext)]pb, at the center-of-mass energy s=10.86GeV.