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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2004, vol. 92, p. 718021-718027

Measurement of the Inclusive Charmless Semileptonic Branching Ratio of B Mesons and Determination of |Vub|

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 AW, Breon A. B., Brown D. N., Button-Shafer J., Cahn R. N., Charles E., Day C. T., Gill M. S., Gritsan A. V., Groysman Y., Jacobsen R. G., Kadel R. W., Kadyk J., Kerth L. T., Kolomensky Y. G., Kral J. F., Kukartsev G., 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., Ford K., Harrison T. J., Hawkes C. M., Knowles D. J., Morgan S. E., 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., Boyd J. T., Chevalier N., Cottingham W. N., Kelly M. P., Latham T. E., Mackay C., Wilson F. F., Abe K., Cuhadar-Donszelmann T., Hearty C., Mattison T. S., McKenna J. A., Thiessen D., 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 Y. I., Solodov E. P., Yushkov A. N., Best D., Chao M., Kirkby D., Lankford A. J., Mandelkern M., McMahon S., Mommsen R. K.

The charmless semileptonic branching fraction of B mesons in sample of 89 × 106 BB̄ pairs were collected at υ(4S) resonance. The reconstruction of decay of one B meson and identification of charged lepton from decay of other B meson was also determined. The branching ratio fractions were calculated by number of signal events and were extracted from mass distribution of hadronic system accompanied by lepton. The Cabibbo-Kobayashi-Maskawa matrix element was derived using measured branching fraction for inclusive semileptonic B decays.