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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2010, vol. 104, p. -

Measurement of |Vcb| and the form-Factor slope in b̄→Dℓ- ν̄ℓ decays in events tagged by a fully reconstructed B meson

Aubert B., Karyotakis Y., Lees J. P., Poireau V., Prencipe E., Prudent X., Tisserand V., Tico J. Garra, Grauges E., Martinelli M., Palano A., Pappagallo M., Eigen G., Stugu B., Sun L., Battaglia M., Brown D. N., Kerth L. T., Kolomensky Yu G., Lynch G., Osipenkov I. L., Tackmann K., Tanabe T., Hawkes C. M., Soni N., Watson A. T., Koch H., Schroeder T., Asgeirsson D. J., Fulsom B. G., Hearty C., Mattison T. S., McKenna J. A., Barrett M., Khan A., Randle-Conde A., Blinov V. E., Bukin A. D., Buzykaev A. R., Druzhinin V. P., Golubev V. B., Onuchin A. P., Serednyakov S. I., Skovpen Yu I., Solodov E. P., Todyshev K. Yu, Bondioli M., Curry S., Eschrich I., Kirkby D., Lankford A. J., Lund P., Mandelkern M., Martin E. C., Stoker D. P., Atmacan H., Gary J. W., Liu F., Long O., Vitug G. M., Yasin Z., Zhang L., Sharma V., Campagnari C., Hong T. M., Kovalskyi D., Mazur M. A., Richman J. D., Beck T. W., Eisner A. M., Heusch C. A., Kroseberg J., Lockman W. S., Martinez A. J., Schalk T., Schumm B. A., Seiden A., Wang L., Winstrom L. O., Cheng C. H., Doll D. A., Echenard B., Fang F., Hitlin D. G., Narsky I., Piatenko T., Porter F. C., Andreassen R., Mancinelli G., Meadows B. T., Mishra K., Sokoloff M. D., Bloom P. C., Ford W. T., Gaz A., Hirschauer J. F., Nagel M.

We present a measurement of the Cabibbo-Kobayashi-Maskawa matrix element |Vcb| and the form-factor slope ρ2 in B̄→Dℓ-ν̄ℓ decays based on 460×106 BB̄ events recorded at the Υ(4S) resonance with the BABAR detector. B̄→Dℓ-ν̄ℓ decays are selected in events in which a hadronic decay of the second B meson is fully reconstructed. We measure B(B-→D0ℓ-ν̄ℓ)/B(B-→Xℓ- ν̄ℓ)=(0.255±0.009±0.009) and B(B̄0→D+ℓ- ν̄ℓ)/B(B̄0→Xℓ-ν̄ℓ)=(0.230±0. 011±0.011), along with the differential decay distribution in B̄→Dℓ-ν̄ℓ decays. We then determine G(1)|Vcb|=(42.3±1.9±1.4)×10-3 and ρ2=1.20±0. 09±0.04, where G(1) is the hadronic form factor at the point of zero recoil. © 2010 The American Physical Society.