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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2003, vol. 67, p. -

Measurement of B0→Ds (*)+D*- branching fractions and B 0→D*s +D*- polarization with a partial reconstruction technique

Aubert B., Barate R., Boutigny D., Gaillard J. M., Hicheur A., Karyotakis Y., Lees J. P., Robbe P., Tisserand V., Zghiche A., Palano A., Pompili A., Chen J. C., Qi N. D., Rong G., Wang P., Zhu Y. S., Eigen G., Ofte I., Stugu B., Abrams G. S., Borgland A. W., Breon A. B., Brown D. N., Button-Shafer J., Cahn R. N., Charles E., Gill M. S., Gritsan A. V., Groysman Y., Jacobsen R. G., Kadel R. W., Kadyk J., Kerth L. T., Kolomensky Yu G., Kral J. F., Leclerc C., Levi M. E., Lynch G., Mir L. M., Oddone P. J., Orimoto T. J., Pripstein M., Roe N. A., Romosan A., Ronan M. T., Shelkov V. G., Telnov A. V., Wenzel W. A., Harrison T. J., Hawkes C. M., Knowles D. J., O'Neale S. W., Penny R. C., Watson A. T., Watson N. K., Deppermann T., Goetzen K., Koch H., Lewandowski B., Pelizaeus M., Peters K., Schmuecker H., Steinke M., Barlow N. R., Bhimji W., Boyd J. T., Chevalier N., Clark P. J., Cottingham W. N., Mackay C., Wilson F. F., Hearty C., Mattison T. S., McKenna J. A., Thiessen D., Jolly S., Kyberd P., McKemey A. K., Blinov V. E., Bukin A. D., Golubev V. B., Ivanchenko V. N., Kravchenko E. A., Onuchin A. P., Serednyakov S. I., Skovpen Yu I., Yushkov A. N., Best D., Chao M., Kirkby D., Lankford A. J., Mandelkern M., McMahon S., Mommsen R. K., Roethel W., Stoker D. P., Arisaka K., Buchanan C.

We present a study of the decays B0→Ds (*)+D*-, using 20.8 fb-1 of e +e- annihilation data recorded with the BABAR detector. The analysis is conducted with a partial reconstniction technique, in which only the Ds (*)+ and the soft pion from the D*- decay are reconstructed. We measure the branching fractions B(B0→Ds +D*-) = (1.03±0.14±0.13±0.26)% and B(B0→D* s +D*-) = (1.97±0.15±0. 30±0.49)%, where the first error is statistical, the second is systematic, and the third is the error due to the Ds + → φπ+ branching fraction uncertainty. From the B 0→D*s +D*- angular distributions, we measure the fraction of longitudinal polarization ΓL/Γ = (51.9±5.0±2.8)%, which is consistent with theoretical predictions based on factorization. © 2003 The American Physical Society.