Measurement of the B0bar --> D*+ l- nubar_l Decay Rate and |Vcb|

Abstract

We present a measurement of the Cabibbo-Kobayashi-Maskawa matrix element |Vcb| based on a sample of about 53,700 B0bar --> D*+ l- nubar_l decays observed by the BaBar detector. We obtain the branching fraction averaged over l = e, mu, BR(B0bar --> D*+ l- nubar_l) = (4.90 +- 0.07(stat.) +0.36-0.35(syst.))%. We measure the differential decay rate as a function of w, the relativistic boost gamma of the D*+ in the B0bar rest frame. By extrapolating dGamma/dw to the kinematic limit w --> 1, we extract the product of |Vcb| and the axial form factor A_1(w=1). We combine this measurement with a lattice QCD calculation of A_1(w=1) to determine |Vcb| = (38.7 +- 0.3(stat.) +- 1.7(syst.) +1.5-1.3(theory)) * 10^-3.

8 pages, 4 postscript figures, contributed to ICHEP'04, 32nd International Conference on High Energy Physics, 8/16 - 8/22/2004, Beijing, China. Submitted to Phys. Rev. D (Rapid Communications)

References in corpus (8)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• The BABAR Detector
• Lattice calculation of the zero-recoil form factor of anti-B --> D* lepton anti-neutrino: toward a model independent determination of |V(cb)|
• Determination of the Branching Fraction for B --> Xc l nu Decays and of |Vcb| from Hadronic-Mass and Lepton-Energy Moments
• Measurement of V_{cb} from the decay process \bar{B^0} -> D^{*+} \ell^- \barν
• Determination of |Vcb| using the semileptonic decay \bar{B}^0 --> D^{*+}e^-\barν
• Improved Measurement of |Vcb| using B --> D* l nu Decays
• Determination of the B-bar --> D* l nu-bar Decay Width and |V_cb|

Cited by in corpus (9)

• New Physics at a Super Flavor Factory
• Determination of the Form Factors for the Decay B0 -> D*- l+ nu_l and of the CKM Matrix Element |V_cb|
• New analysis of semileptonic B decays in the relativistic quark model
• Study of the leptonic decays of pseudoscalar $B,D$ and vector $B^{\ast },D^{\ast }$ mesons and of the semileptonic $B\to D$ and $B\to D^{\ast }$ decays
• A Measurement of the Branching Fractions of exclusive Bbar -> D(*)(pi)l-nubar Decays in Events with a Fully Reconstructed B Meson
• Quenched lattice calculation of the vector channel B --> D* l nu decay rate
• Measurements of the B to D* Form Factors Using the Decay B0 --> D* e nu_e
• Measurement of the Relative Branching Fractions of Bbar --> D/D*/D** l^- anti-nu_l Decays in Events with a Fully Reconstructed B Meson
• Static and dynamic properties of hadronic systems with heavy quarks b and c