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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2013, vol. 87, p. -

Precise measurement of the branching fractions for Bs0→Ds(*) +Ds(*)-and first measurement of the Ds*+Ds*-polarization using e+e- collisions

Esen S., Schwartz A. J., Aihara H., Asner D. M., Aushev T., Bakich A. M., Belous K., Bhuyan B., Bozek A., Bračko M., Browder T. E., Chekelian V., Chen A., Chen P., Cheon B. G., Chilikin K., Chistov R., Cho I. S., Cho K., Choi Y., Dalseno J., Danilov M., Doležal Z., Drutskoy A., Eidelman S., Feindt M., Gaur V., Haba J., Hara T., Hayashii H., Horii Y., Hoshi Y., Hou W. S., Hsiung Y. B., Hyun H. J., Iijima T., Ishikawa A., Itoh R., Iwabuchi M., Iwasaki Y., Iwashita T., Julius T., Kang J. H., Kawasaki T., Kiesling C., Kim H. O., Kim K. T., Kim M. J., Kim Y. J., Kinoshita K., Ko B. R., Koblitz S., Kodyš P., Korpar S., Kouzes R. T., Križan P., Krokovny P., Kuhr T., Kumita T., Kwon Y. J., Lee S. H., Li J., Li Y., Libby J., Liu C., Liu Y., Liventsev D., Louvot R., McOnie S., Miyata H., Mizuk R., Mohapatra D., Moll A., Muramatsu N., Nakao M., Nakazawa H., Natkaniec Z., Ng C., Nishida S., Nishimura K., Nitoh O., Ohshima T., Okuno S., Olsen S. L., Onuki Y., Pakhlova G., Park C. W., Park H., Park H. K., Pedlar T. K., Pestotnik R., Petrič M., Piilonen L. E.

We have made a precise measurement of the absolute branching fractions of Bs0→Ds(*)+Ds(*)- decays using 121.4 fb-1 of data recorded by the Belle experiment running at the Υ(5S) resonance. The results are B(Bs0→Ds+Ds-)=(0.58-0.09+0.11±0.13)%, B(Bs0→Ds*±Dsâ̂)=(1.76-0.22+0.23±0.40)%, and B(Bs0→Ds*+Ds*-)=(1.98-0.31-0.50+0.33+0.52)%; the sum is B(Bs0→Ds(*)+Ds(*)-)=(4.32-0.39-1.03+0.42+1.04)%. Assuming Bs0→Ds(*)+Ds(*)- saturates decays to CP-even final states, the branching fraction constrains the ratio ΔΓs/ cosâ¡12, where ΔΓs is the difference in widths between the two Bs-B̄s mass eigenstates, and 12 is the CP-violating phase in Bs-B ̄s mixing. We also measure for the first time the longitudinal polarization fraction of Bs0→Ds*+Ds*-; the result is 0.06-0.17+0.18±0.03. © 2013 American Physical Society.